- The more parsimonious explanation is that commercial jet engine production is downstream of commercial airbody production and China's currently limited by COMAC's scaling woes. All the money and talent in the world can't replicate real users generating real data that you can use to improve.
I'd argue the opposite that jet engines have a market structure that's uniquely terrible for traditional free market societies. There's a few industries where structurally, companies can only exit the market but it's almost impossible for a new company to enter. Airframes, jet engines, CPU manufacturing, lithography etc.
What this dynamic doesn't make any company immune from though is corporate rot. You've seen the rot take down Boeing and Intel from the inside as a slow moving car wreck. There's no reason the rot can't take down ASML, TSMC or Airbus as well. The free market fundamentally doesn't have a good response to this problem, excess capital is taken out of these companies during good times and then they run to governments seeking bailouts during bad times but governments don't know how to mandate good corporate governance.
I think a lot of the jet engine manufacturers are seeing this same corporate rot process, the number of high profile scandals across the industry and reports of insiders on how the number crunchers are taking over the business are strangely reminiscent of what we heard out of Boeing and Intel.
- > The free market fundamentally doesn't have a good response to this problem
The market may not for the most capital-intensive businesses, but US laws at least attempt to address the situation. In Boeing's case, for example, the McDonnell-Douglas merger likely could have been blocked under existing anticompetitive laws.
The US's longstanding refusal to apply antiticompetition law causes a number of harms to consumers, entrepreneurs, and the stability of our economy.
- Condit would probably still set in motion the moves that enabled the rot - moving HQ, unrealistic targets for 7X7 (now known as 787), selling off portions of Boeing to skim just the cream at the top, and so on.
Not letting Boeing grab McDonnell-Douglas military projects might have stopped some of that, but it might have also accelerated it.
- My impression was that it was a reverse buyout. Where did senior management come from after the merger?
- Except that if it accelerated it then there would still be an independent McDonnel-Douglas to pick up the slack by getting into the passenger airliner business, and in turn the possibility of that would keep pressure on Boeing to clean up their act.
- The reason MDD was merged into Boeing is MDD was in the process of failing: the MD10 was completely outdated, the MD11 was not competitive, and with the Cold War ending the infinite money tap of military projects was closing (it was already quite a ways there, the last supper was in 1993, by the time of the MDD merger half the major contractors were gone)
- Even so, mergers foreclose options to promote competitiveness. For example: no well-capitalized companies from outside the immediate industry could buy MDD to enter the space (as RocketLab bought Iridium). A failing MDD could have limped along for a decade or more until a tech billionaire (say) decided to buy in and reinvigorate it. It could have been split up, allowing smaller entrants to buy parts of it. It could have been allowed to fail, so any of these types of transactions could have happened at smaller dollar amounts.
Basically, allowing it to merge with its largest competitor was the worst possible outcome for competitiveness and long-term health of the industry.
More to my point, though. There's no real reason our existing anticompetition laws should not have been enforced here. Our culture of selective enforcement of laws is a cancer that manifests in all kinds of negative ways. I strongly advocate that we move towards being a society governed by written laws.
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- The simplest explanation is surely that China is new to having a highly educated workforce and the ‘failed for some fifty years’ claims the article makes don't mean much given it.
I don't think you need to entrain market arguments or whatnot to this, when it's only in the last decade China was a strong advanced manufacture player, and turbines are the kind of project that you probably wouldn't expect to go much faster than that regardless of the demand.
- Exactly. Advanced turbine manufacturing is largely a chemistry and metallurgy problem. The Great Leap Forward and Cultural Revolution killed off China's intellectual capital so they had to start from scratch in 1976, and only really got moving in 1992. They've been way behind but will catch up eventually.
- Because repression is a thing of the past in China? They continue to persecute investors and business executives who get too successful and to repress academic work they find politically objectionable. The communist party continues to exercise control over all intellectual endeavors.
And don't think it doesn't matter for jet engines. This article gets into how the open acknowledgment and dissection of engine failure in the West promotes quality and that China has clearly not adopted this culture. Of course not.
They'll catch up in the same way the Soviet Union used to - at unsustainable cost and on the way to falling behind yet again.
- Boom Supersonic is entering the turbine engine market using private funding (they have received some limited government contracts and tax incentives). It seems like the free market is responding pretty well, although they still might fail.
https://aviationweek.com/air-transport/aircraft-propulsion/b...
- That was my thought too. You can absolutely enter the industry, and big players do as the industry becomes profitable enough to sustain more competitors, it's just not available to the average person in the same way the average person can easily compete in the todo app industry.
- > I think a lot of the jet engine manufacturers are seeing this same corporate rot process, the number of high profile scandals across the industry and reports of insiders on how the number crunchers are taking over the business are strangely reminiscent of what we heard out of Boeing and Intel.
And there's the opening for China. The 90s and early 2000s saw alot of innovation by engine manufacturers. Boeing and Airbus built their planes around the next generation of engines coming out. But over the past 10 or so years all the major engine manufacturers decided to stop investing in new civilian engines and maximize their dividends on existing models. That's what killed the A380--the A380 engines are 90's tech, and all the engine manufacturers declined to build a new engine for an upgraded A380, not even one that utilized the current tech, and not even if Airbus backstopped potential losses.
So now is probably the best time since the 1980s for China to play catch-up. But the biggest problem is as you pointed out--engines and airframes are developed together, and both Airbus and Boeing also decided to stop new aircraft development and instead coast and reap dividends for the next decade or two, so there's no market for China to break into. There's still development happening in the defense space, but that's not a market open to China, either. Their only potential market is primarily domestic, and it's not capable of incentivizing and demanding dogged innovation in the same way the international market could.
- Modern high bypass jet engines are already pretty close to maximum possible thermodynamic efficiency, given realistic constraints such as weight, wing clearance, noise, and so on.
Even if all constraints were relaxed, the absolute limit might be another halving of fuel consumption. (with trillions of R&D)
And beyond that, there literally can never be jet engines significantly more efficient, until the end of the universe.
- There is still the potential for significant efficiency improvements with open rotor ultra-high bypass propfan designs.
https://www.geaerospace.com/news/articles/shape-things-come-...
And for short flights, battery electric or hybrid power could boost efficiency even further. Although that will depend on developing batteries with better safety and power density characteristics.
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- The A380 was killed for lack of demand as the airline industry changed. Boeing made the right bet.
In addition even if had been engine-centric there is no way there was enough market to dedicate R&D for a new engine for this limited market.
- Yes and no. Had there been more demand it would still be around, of course. But one of the reasons (albeit a lesser reason) there wasn't much demand was because of the antiquated engine tech. The poor A380 fuel efficiency competitiveness had less to do with it having 4 engines than that those engines were 1990s tech, same generation as on the 777, despite the first delivery of the A380 being more than 10 years after the 777. The 787 and A350 were favored by the industry not only because of point-to-point, but because their engines had far better fuel efficiency. (Even at the same generation, ETOPS aircraft would have slightly better fuel efficiency, but maintenance and overall operational cost is significantly higher because of the power envelop and reliability margins required, keeping the quadjet A380 cost competitive.)
Both Airbus and Emirates were willing to keep the A380 alive. Emirates was making money on it, and Airbus believed the market would eventually turn as airports reached takeoff/landing capacity. But Emirates wanted upgraded engines, so for several years there were negotiations between Emirates & Airbus on the one hand, and the big 3 engine makers on the other. IIRC, circa 2018 Emirates & Airbus were very close to a binding agreement with Rolls-Royce for an upgraded engine, but then Rolls-Royce faced costly issues with its existing programs. At the same time, prospective investment in the engine industry had already started winding down, and Rolls-Royce didn't want to be spending cash on a new program while GE and Pratt & Whitney were passing through profits to shareholders. So in 2019 Rolls-Royce walked away, and shortly thereafter (weeks if not days), Airbus and Emirates agreed to terminate the A380.
It's difficult to find non-paywalled sources, but see, e.g., https://www.forbes.com/sites/michaelgoldstein/2018/10/16/is-...
- ≥jet engines have a market structure that's uniquely terrible for traditional free market societies.
A lot of the theoretical concepts behind this... They need updating to account for the last generation of experience. For the most part, the concepts were developed in the context of the industrial revolution(s) and manufacturing.
We are talking about manufacturing here, but the US economy in the last generation is a story about software, services, non-manufacturing firms and manufacturing firms the side step (as best they can) the core paradigm of manufacturing economics.
Competitive pricing, substitutes and alternatives, a strategic paradigm governed by market prices, marginal costs, and manufacturing quality... This is relatively marginal paradigm in the US economy, certainly in terms of market cap. In china, it is their bread and butter.
Low margin, highly competitive components manufacturing... Is that really a forte a free market societies in 2026? We outsource the "commodity value add" parts of the process. We certainly do not put them at the center of corporate strategy.
I agree about "corporate rot." I don't think anyone has a good answer to this either. China included. In practice, the best solution appears to be young vibrant companies. VW or Ford vs Tesla & BYD. VW and Ford exist because of history. Tesla & BYD exist because they perform well.
Schumpeter's free market solution was creative destruction... But, we've never really had a system for promoting this.
Part of the problem is that in a global market, allowing a company to fail creates room in the market for renewal, but there's no guarantee that your country will fill it. If Germany had come down hard on VW after the turbo diesel scandal... They probably would have just ceded market share to Korea or China or the US or something.
- That said, we're still running heavy presses:
https://en.wikipedia.org/wiki/Alcoa_50,000-ton_forging_press
(which has made parts for pretty much every U.S. produced jet aircraft since the '60s)
Interestingly, Tesla has invested in some largish presses:
https://en.wikipedia.org/wiki/Giga_Press
which makes for a large reduction in the quantity of parts (but also complicates repairs https://www.northwestautocollision.com/the-most-common-tesla...)
- > The free market fundamentally doesn't have a good response to this problem, excess capital is taken out of these companies during good times and then they run to governments seeking bailouts during bad times
This isn't a free market problem. Companies move money out to avoid corporation tax, and government bailouts are what stop the free market from operating as it should.
- I'd expect the competition for these companies to come in not from someone using the same technology, but a different technology that serves the same purpose. Eg. what happened to Kodak and Nokia.
For jet engines, the only thing that comes to mind is electric aircraft. No single-crystal turbine blades needed at all.
I may have picked a bad example, but the principle stands.
EDIT: China has an extensive high-speed rail network. While those don't quite cover intercontinental flight, it is the sort of paradigm shift I mean.
- The problem with fully electric airliners is physics: to achieve useful range you either need batteries with energy density that seems unfeasible or some sort of power beaming infrastructure which has its own set of enormous challenges. So if Western turbofan manufacturers' moat lasts until electric aviation is ubiquitous, they can be very, very happy.
(Now sure, you can substitute electric aircraft with open rotor jet engines which require different institutional knowledge to modern high bypass turbofans, but they're still really sensitive to how the blades are manufactured)
- > I may have picked a bad example, but the principle stands.
I know electric aircraft are not quite feasible on the same scale as airlines.
On the other hand, China has an extensive high-speed rail network for inland travel. OI have no idea how often the Chine fly inside the country vs how often they use aircraft, but this is the sort of different technology for the same purpose I mean.
- Serious electric aircraft are really gated behind major advancements in battery technology or some alternative power storage tech. The energy density of batteries is an order of magnitude less than fossil fuels, and you have to carry the heavy batteries with you the entire trip (vs burning off fuel as you fly).
- > governments don't know how to mandate good corporate governance.
The correct answer to this is to break up consolidated markets with antitrust. Are there only two airframe manufacturers left? Then chop them into smaller pieces so there are more. Reduce vertical integration so that it gets easier for new entrants to compete at any given part of the supply chain without needing to duplicate the entire thing themselves. Let each of the spin offs start with a non-exclusive license to the no longer existent parent company's technology so they all have the chance to iterate on it and compete for providing it.
And don't let them buy each other again.
- Problem with antitrust hammers is that once you've chopped Boeing into bits you don't end up with a competitive market with lots of new aircraft designs, you end up with a global Airbus monopoly on aircraft over 150 seats and the few surviving bits of Boeing competing to sell into its supply chain...
Airframers really aren't that vertically integrated as companies go. But it turns out the business of designing, certifying and selling an aircraft (and managing complex multinational supply chains) is hard, and airlines don't want 6 competing types of narrowbody in their fleet, they want one type of narrowbody in their fleet with an abundance of type-rated pilots, multiple maintenance options and a robust aftermarket.
- > The free market fundamentally doesn't have a good response to this problem, excess capital is taken out of these companies during good times and then they run to governments seeking bailouts during bad times but governments don't know how to mandate good corporate governance.
Sounds like the free market hasn't been tried, a key plank of the free market on the supply side is that incompetent managers have to go bankrupt and lose their capital or otherwise get squeezed out. If the government is going to bail people out then obviously the companies will take adopt a ridiculously risky management strategy because they get the upside and dodge the downside, so they just have to maximise the potential upside at any cost. No surprise if after getting a bailout people do exactly what they did that led to the bailout until they need another bailout. Why change?
The trick to "mandating" of good corporate governance is not to bail them out. Then at least the corporations will be governed in a way that they aren't likely to go bankrupt. Maybe even make things people want and sell them at a profit.
> here's a few industries where structurally, companies can only exit the market but it's almost impossible for a new company to enter. Airframes, jet engines, CPU manufacturing, lithography etc.
Is there actual evidence for this, or are the companies involved just doing a good enough job that the market doesn't see a need for new entrants? Because it actually seems a bit implausible that these technologies could just disappear or even become less available under a free market. What we actually see is the likes of NVidia or ASML, where other players can't catch up because the market leader is just pushing the cutting edge forward too quickly (spare a thought for Intel, who was the unbeatable colossus once).
- The free market works fine - the problem is at that scale, we can only afford a few key players, they're strategic so they end up having subsidies other considerations.
Put differently: if the population of the earth were 50 Billion people instead of 8 Billion - then we'd have markets with enough competition to allow free market dynamics.
In that context, then we'd have 'Space companies' being subsidized.
We'd have a hotel on the Moon and we'd easily be on Mars already.
Those aircraft are on the 'edge of our resource capabilities' - huge companies at the top of the pyramid.
If we had a massively bigger economic pyramid, they would be more like car companies.
- So you think U.S. would be better at airplane manufacturing had Boeing gone bankrupt at some point in the past?
It's a pretty strong claim and I would like to see some theoretical justification, other than belief in the magical free market.
In my country, IIRC, we let Aero Vodochody to crash and be bought by Boeing. We are not better at making airplanes, honestly probably the worst than at any other point in history.
- > All the money and talent in the world...
One nitpick, all the money in the world would be able to achieve the goal by simply giving rides away for free.
Overall, I agree that any industry that is extremely optimized requiring ultra high precision+knowledge in multiple verticals makes the barrier to entry beyond difficult. It just requires too much up front cash.
- > ...governments don't know how to mandate good corporate governance...
For a very brief moment, under the existential crisis condition of total war in WW2, the US government was somehow able to corral corporate governance towards a semblance of common purpose (survival). As I understand it from historians malfeasance was still widespread, but we arguably maybe got a good enough outcome?
This is the corporate equivalent of the shirtsleeves to shirtsleeves in three generations problem. And if that corollary is true, then I suspect the remedy is similarly not entirely amenable to deterministic antiseptic metrics and processes; they're necessary but not sufficient conditions.
- Massive stimulus spending, everyone in the country highly motivated and oriented around a communitarian / natonalist goal.
You can see it in ukraine right now - they are making drones in their basements in ways that no other country is.
These are hard things to factor into economics just as they are very real.
Undoubtedly some competition would help.
- > All the money and talent in the world can't replicate real users generating real data that you can use to improve
Basically, China excellence in EVs and Solar was driven by the market being new. It's hard (almost impossible?) to outrank an incumbent very entrenched in a big market. You need a paradigm shift (ie: iphone vs nokia) to make the change.
- > You need a paradigm shift (ie: iphone vs nokia) to make the change.
I imagine the manufacturing breakthrough for high temperature jet turbine blades could be additive manufacturing where you grow the crystalline structure layer by layer instead of casting and carefully nurturing it. Mature markets with few incumbents focus on local maxima and have difficulty to move from one maxima to another, while a new manufacturer can start from a different position and search for other maxima.
- Directional solidification is a kind of additive manufacturing? You're carefully adding to macroscopic crystalline structure at a propagating melt/solid interface.
- It kind of is, but it happens within the molten part, so it's harder to control (and, considering how hard, I'd say the science behind it is still poorly understood).
- They get perfect enough single crystal superalloy blades every time ... after throwing out the half that fail. The science is well understood, even if it's fiendishly hard [0]
0 - https://www.asme.org/wwwasmeorg/media/resourcefiles/aboutasm...
- Or good spies who steal the secrets + few years of subsidies to give runway for the new companies
- You mean like when the NSA is spying on Airbus for Boeing? :)
https://www.bbc.com/news/world-europe-32542140
(it's particularly hilarious (in the bad way), that German secret services were participating in spying as well)
Thankfully some countries (here: Brazil) have some spine to react to it: https://www.reuters.com/article/business/saab-wins-brazil-je...
- When I was at uni in the 90s I remember hearing one of our lecturers tell stories about visitors to British Aerospace being caught wearing shoes with sticky soles to try and capture small amounts of swarf for industrial espionage.
So yes, that does happen.
- You can steal ‘know’ but you can’t so easily steal ‘knowhow’. I could easily find all the information that I theoretically need to make a wooden chair. But to actually make it successfully would require years of practice at carpentry. At first, I can expect results comparable to Homer Simpson’s spice rack.
- There may be a fraction of this, but the great thing about science is that it is verifiable.
- > The free market fundamentally doesn't have a good response to this problem
Free markets don't exist.
The problem isn't what you think it is. It's Dunning-Kruger effect and 99% of the population is living it loud and proud.
- I work in the aviation industry. This was a good read. The article hinted at the oligopolies that exist in aviation and in practice the industry is incredibly conservative and slow to change (particularly commercial aviation). While new technology is developed all the time, the extreme regulatory oversight combined with so much of the industry relying on long-standing relationships makes it difficult for any new entrant to come into the market. There is also a lot of domain specific knowledge that seems difficult to easily transfer.
- Honestly this is a good thing. I can endure buggy software but I don’t want to deal with buggy planes. Regulatory pressure is a market force and a useful one too. There’s a huge difference between ship fast and ship right - the latter one requires deep pockets and willingness to commit to ongoing risk. People always say big Pharma and aviation and such are oligopolies, and that’s bad, but they rarely see the capital intensiveness of the whole process. Some things are slow and deliberate and restricted to big corporate only for good reasons
- > Regulatory pressure is a market force and a useful one too.
That's assuming the regulations are competent. But if you let the market consolidate then the incumbent has enough money to buy off the government. Or it happens the other way around and the government is kind enough to set out regulations that only a megacorp can satisfy, thereby destroying the competition and awarding the last company standing the vaunted "too big to fail" get out of jail free card.
Which in turn gets you the 737 MAX sort of problems where the regulations both cause a problem (recertification is prohibitively expensive) and then fail to impede the incumbent's efforts to shirk it because you can't be damaging the business of your only domestic producer.
- I agree partially with this. America is a special circumstance because of the way the industrial complex and government contracts are linked, and there’s a lot of blatant corruption. If you look at the European regulation framework I believe it works rather well. You have multiple big companies delivering components for different parts of the airplanes from different countries which are all individually big but not too big to fail because no government is solely reliant on them.. as it should be
- I agree that regulatory pressure is a market force (I wish more people understood this), but I disagree that capital intensive things that must be done right can only be done by big organizations - quite the opposite. If the regulatory environment is strong and effective, small organizations can thrive even in pharma and aviation. If an industry is comprised solely of huge organizations, then when one becomes corrupted (like Boeing has, see the 737 MAX debacle) it becomes impossible to terminate that organization. Organizations that are too big to fail are too big to be regulated.
- There is an old saying in the engineering world: “Regulations are written in blood.
- They had an immense amount of blood on tap to utilize when they penned out the PATRIOT Act and I think the results speak for themselves.
I know your comment was likely made as a knee jerk reaction to the above comment but I implore the reader to actually consider the process and incentives by which rules and regulations are created and how an assumption of good faith negatively affects the rules and laws we get.
- > I can endure buggy software but I don’t want to deal with buggy planes
A plane built for resilience against defective engine components would be very different from the airliners we fly today. I would assume more engines for redundancy, better protection against catastrophic failure, different designs to allow engines to function even if parts flew out, and so on. It’s an interesting design exercise to build from radically different expectations from the fundamental parts.
Alternatively, a far less radical redesign would be turbines running at a much more forgiving regime feeding electric motors.
- The philosophy in aerospace is more to build a better engine rather than to have more engines, and this extends to every aspect of aircraft design. Engines are already built to contain catastrophic failure, and the planes themselves remain functional for all but the most extreme situations. We're at the point where essentially every lost aircraft is a compound failure, with significant human factors contributing to the event. It's likely that we're on the pareto front of what engineering can reasonably accomplish, and the only gains in safety either barely nudge the needle of what we would notice (better materials, say), or difficult for the market to accept (removing pilots altogether).
Aerospace RND has been looking into hybrid propulsion systems for a long time. If there's one thing they aren't shy about pushing, it's the ability to go higher, faster, more efficiently. Such systems aren't used because they aren't yet good enough.
- There's no reason think that removing pilots altogether would enhance safety. Military experience has shown that mishap rates for unmanned aircraft are significantly higher than similar crewed aircraft. Routine flight operations can be automated pretty well now but where human pilots really earn their pay is with handling emergencies and other unexpected situations. The variety of potential emergencies is effectively infinite so it's simply impossible to write and test code to handle them in advance. Instead pilots have to improvise in real time based on intuition and first principles logic. Current AI technology still isn't capable of that.
- Lol.
Do you think todays aircraft are not designed with the idea that the engine can fail?
And if you have unreliable components do you think redundancy is going to save you?
And lets be real - there already exist a aerospace arena where you have a higher number of CAT-events - it's called the military. And they deal with it by having a parachute for each passenger..
No - in effect building jet-engines (that are commercially viable i.e. fuel and efficeny) is not a easy to disrupt business. And the cost of entering it would be - high. And the benefit, well less obvious.
- > Do you think todays aircraft are not designed with the idea that the engine can fail?
Of course they are - but the engines are also designed to be extremely reliable, and that's why you get away with two engines on long flights over water, something previously only available for planes with four engines.
> No - in effect building jet-engines (that are commercially viable i.e. fuel and efficeny) is not a easy to disrupt business.
That's true. My point being that building a better jet engine might be the hardest way to disrupt the business - making a better propulsion system, which might or not include a jet engine, is a less difficult approach. If you have an electric plane with two motors, a big APU-like turbine charging a battery and powering the motors, you might get away with a cheaper turbine, running in less extreme regimes, and still have a more fuel efficient plane requiring less maintenance than a pure turboprop would.
You don't win a stacked game by playing it by the rules. You win by changing the game to another one you can actually win. China did that with cars already.
- Aerospace as a discipline has tried just about every propulsion system under the sun. What you're proposing has already been flight tested on an unmanned vehicle, albeit with many smaller props for a larger effective prop disk than the two you're proposing. This is actually better, because electric motors want to use rpm control, so you need to keep the moment of inertia of the propellers low. The efficiency penalty of smaller props is overcome by having many of them arranged closely together to create a large effective prop disk.
For a hybrid system to be worth it, you need to claw back more efficiency than you lose in going from mechanical energy to electrical energy, and then back again. For cars, this is generally the case, because they're always accelerating and decelerating. Their wide operating band means that the engine will always be a game of compromises, which is why sticking a motor and battery in the loop and decoupling the engine from the wheels is beneficial. But planes aren't like that; they go from setpoint to setpoint, and they stay in a given configuration for long periods of time. They have very narrow, highly optimized operating bands, so hybridization just isn't as effective.
- > For a hybrid system to be worth it, you need to claw back more efficiency than you lose in going from mechanical energy to electrical energy, and then back again.
For short-haul you spend a lot of time climbing and descending in relation to long flights, so the plane spends less time at the optimum the engines were designed for (cruise), so, if the power unit can be at the peak efficiency throughout the flight, with extra energy being supplied by the onboard battery for take-off and the power unit be shut down for descent, we might get to a point where it's economically viable, depending on battery operating costs and weight.
You are right to point out the aerospace industry has tried everything conceivable to see what sticks, but technology evolution sometimes throws us a curveball.
- > If you have an electric plane with two motors, a big APU-like turbine charging a battery and powering the motors, you might get away with a cheaper turbine, running in less extreme regimes, and still have a more fuel efficient plane r
This works for hybrid cars because the power demand when driving varies widely, as does the output speed. The 'hybrid' bit gets huge gains by always running the engine at optimal rpm+throttle, and using the battery to cover peaks and absorb troughs (regen).
A plane cruises for many hours at a fairly constant speed and throttle, which is designed to hit peak efficiency of all components. The 'hybrid' design therefore falls far behind on weight, efficiency and cost.
- That's correct to an extent. It could never work for long haul flights due to the weight penalty but there is potential for regional flights. Current airliner turbine engines are sized to deliver enough thrust to safely take off and climb even if one engine fails. In theory the necessary excess thrust could be delivered by a hybrid system during critical phases of flight. We might see that for flights like SFO to LAX in a few decades.
- Is aviation encumbered with patents like software development is?
- For aerospace it's more like asking if Google, Meta, and Apple are encumbered by patents, because they're all big players. The smaller players tend to do one hyper-specific thing for a big player.
Also for aerospace the patents are more legitimate. Software is encumbered by stupid patents <obvious idea> but on a computer! whereas aerospace patents are more legitimately about hardware that indeed took years and millions to develop and optimize.
- > ...whereas aerospace patents are more legitimately about hardware that indeed took years and millions to develop and optimize.
Something that leaps out at me reading through semiconductor and aerospace patents is a noticeable fraction of them are basically saying, "hey, <non-obvious process understanding that pushes our limits of comprehension of physics required> to achieve some desired effect was found to be useful, but it consumed <years and millions to develop and optimize> because it was such a convoluted journey filled with zillions of dead ends, so we want a patent on that because the end result only looks obvious in hindsight". I don't see as much of this in software at this time, though I suspect it may change in the future.
- Jet Engines Aren’t “Made In China” because companies are not allowed to outsource jet engines manufacturing to China. Gas turbine engines and associated equipment are seen as military technology, which is subject export controls by International Traffic in Arms Regulations (ITAR) of U.S. Department of State.
https://precisionam.com/articles/precision-machining/itar-re...
https://aircraft.zone/navigating-the-rules-a-guide-to-u-s-ex...
- This plus subsidizing R&D via military contracts is how jet engines for passenger aircraft remain a US and European pursuit.
Will jet engines never be made in China? Don't bet against them. There's no guarantee that the legacy of the Cold War technology race will continue to subsidize western jet engine development.
There are reasons to think this subsidized moat will hold for a while: geared turbofan engines will deliver another increment in efficiency that passenger airlines can't ignore. Until that technology step is commoditized, the incumbent jet engine makers are relatively safe.
- I would not bet against China. All the R&D done in US and Europe could be done also in China, but R&D takes time.
Lot technological development in China in the last two decades was result of US and European companies outsourcing manufacturing to China and most importantly, sharing know-how with Chinese companies.
I recommend the book "How China Captured Apple" by Patrick McGee
https://www.thewirechina.com/2025/05/25/patrick-mcgee-on-how...
This outsourcing development path for jet engines in China is not possible because ITAR.
- The good news for China is we fired or reassigned most of the counterespionage agents to chase gardeners, so lots of technology transfer is happening.
- This is a strange article. I did not find anything that is a blocker for China. China is a relative new comer to jet engines and this technology is tightly guarded by incumbents and needs time to mature.
If China can master nuclear, space, chips, it seems a bit stretch to say they it is the Jer engines where they fail.
- Material engineering is the well known blocker for China, same with semiconductors. They basically have to replicate 50 years of trial and error that is well kept under lock in key in the west.
China hasn’t mastered chips either yet in the same way it hasn’t mastered jet turbines: they can do cheap (high yields, low maintenance costs per hour of use), they can do high performance, they can’t do both yet at the same time.
- CJ1000A is being certified by 2028. It is equivalent to LEAP engines on fuel burn. WS15 and WS19 are all shipping today and have thrust to weight ratio above 10. CJ2000 is a 35-ton trust, genx fuel burn class engine, on track for 2030.
- Like all of high performance Chinese engines, the CJ1000A won’t be commercially viable if it has to be overhauled for every 100 hours of flight time. There is a reason China still imports most of the jet turbines it uses.
Once China figures out how to have both at the same time, they will basically take over the worldwide market, let alone their domestic market.
- So like...bone china then?
- “ well kept under lock in key in the west”
You’re joking. These have been put on network drives since early 2000s and CCP has hacked and exfil them
- the people who do a good chunk of materials science research have last names like wang, li , zhang
you don't exactly need to hack a network drive when you can just hire the guy who came up with it
- > have last names like wang, li , zhang
It's not clear to me whether you already knew that those three names in particular are idiomatic in China as the names of 'random' people. 张三，李四，王五.
(Traditionally 李 was the most common surname in China. Last I heard it had been overtaken by 王.)
I don't know who random guys One and Two are.
- Then where are the jet engines?
- Turns out knowledge alone isn't enough. I mean the knowledge of how to build a nuke, a microprocessor, or a rocket that can go to Mars is public information, yet building them remains elusive for a lot of countries.
- It's not actually public knowledge how to build modern, small still capable microprocessors, afaik.
- It turns out that they’ve really been able to keep the material sciences data under wraps. It is also really hard to reverse engineer from end products. Same with the C919.
- >"50 years of trial and error that is well kept under lock in key in the west."
Bollocks. Russia does that as well, single crystal turbine blades in particular so the west is not the sole gatekeeper here. Given the circumstances Russia might as well share the tech for some things in return
- I doubt that very much. 20ish years ago I read about the Indians being very upset that the engines in the Sukhoi fighters they bought weren't even making it to the promised (very modest) 300 operating hours between overhauls. That's far less than Western engines routinely achieve. And with the hollowing out of the Russian industrial base that's occurred since then, I'd be surprised if it's gotten any better in the intervening years.
- Cheap AND high performance. There is a reason Russian passenger jets are often engined with western jet turbines even though Russia makes their own.
- One more factor: Similar to how this works in semiconductors, some things are just too expensive to build without having an economy of scale.
- Russia is a backwards mongol empire. This is the official narrative on HN, don't you dare suggesting otherwise.
- I even thought that the example of automobiles proved the jet engine analogy wrong.
Sure, automobiles aren’t as complex as a jet engine, but they’re still complex, especially the internal combustion variants.
Something like 10 years ago we were laughing at videos of Chinese cars spectacularly failing crash tests, and now China is selling to very heavily regulated markets.
Same deal with things like high speed rail.
- HSR is just a willingness to say "fuck you" to people who want to hold up progress by refusing to sell land for any price, or who sue to stop a more environmentally-friendly transportation on the grounds of... <checks notes>... environmental impact.
Say what you will, but I don't consider eminent domain to be some kind of mystical technology that only wizards possess.
For automobiles, China didn't compete with the West on its own turf in heavily regulated markets. They embraced EVs from the beginning. Complex auto regulations can't save Europe because EVs are an end-run around all of the complexity of building an economical, low-polluting engine.
Indeed, Europe is talking about relaxing some of its environmental regulations for petrol cars, now that those regulations are more of a barrier to home companies than foreign ones.
- China is winning contracts to build out HSR in other countries. It’s not just about land sovereignty within China. CRRC has won construction contracts in multiple countries in Europe and Asia. When you build more high speed rail miles than the rest of the world combined, you tend to know what you’re doing.
I will point out, the #3 top selling vehicle in the UK is a Chinese SUV with a gasoline engine (Jaecoo 7).
I think the idea that China just can’t make a reasonably competitive ICE vehicle is another outdated notion about China.
- Very surprisingly it's never mentioned that car turbos have very similar requirements - spin at 10K+ RPM at 10000K+ for or tens of thousands of hours with little expected maintenance.
They are often made of superalloys, yet regular cars, down to econoboxes costing 20-30k or less have them, and are made by the millions.
- If you figure a way for airplane to stop on a cloud in mid flight to wait for a tow vehicle I have a Nobel award for you in whatever field you want.
- I agree. They built the J-20, including the engines with several variants. When you look at the whole landscape, it is clearly deliberate and strategic prioritization and sequencing that was the limiting factor.
It doesn’t even take a lot to understand that. It’s the same tried method they’ve been applying for decades now; information gathering, rapid prototyping cycles, quality threshold goals, led by overcapacity dominance. It’s really not much different than agile and “hyperscaling”, accepting massive losses for a long period because the objective is shifting core dynamics.
Ironically, in the US it was used to crush competition and innovation and parasitize the society while on the global scale, China is increasing competition and/or breaking up the monopoly of the parasitic cabal that controls the West and long the world.
- > but they’re still complex, especially the internal combustion variants.
I'm not sure China is known for their ICE designs. Like Korea, I suspect China partially pushed hard for EV specifically because the complexity in a battery + motor system is meaningfully simpler than the ICE equivalent and there's relatively little overlap in many facets outside of some first principles.
Jet engines are like ICE, but with a very reliability threshold. ICE is already complicated, but OEMs will accept a certain deviation on reliability if they need to because occurence might be low and severity is manageable. Not so in jet engine design. A single failure is a big deal.
- Chinese automakers do (or did) make ICE and hybrid cars, too.
I suspect it's wouldn't have been good strategy to try to build those cars for the US, CA or EU markets. An ICE engine is relatively straightforward, but hitting emissions and fuel efficiency targets is complex. [1] And the future of ICE cars, especially in those markets, is limited... why build out emissions expertise, when you can get your foot in the door with EVs?
[1] I recently bought a 1981 VW Vanagon which I try to maintain. That's a perfect time period to see how emissions control forces engine design. My engine has fuel injection and EGR, but a few years back has the same engine block with a carburetor; california emissions uses the same engine, but adds electronic ignition and an o2 sensor in the exhaust for closed loop injection control. A couple years later and they added water cooling. Every so often emissions and efficiency standards got harder to meet and you have to do more stuff.
- The Jaecoo 7 is the #3 top selling car in the UK right now and it has an ICE powertrain.
Low reliability and safety issues kills car brands. Consumers really don’t like it.
Sure, jet engines are on a very different level of reliability standards, but it seems to me that the concepts are all the same: highly regulated market of low-margin complex heavy machinery where it’s difficult to be a new entrant in the market.
- High speed rail technology is not a secret. We in the US just don’t have the will. Auto technology in China was acquired via tech transfers. In order to open mfg in China foreign concerns were forced into partnerships with local companies; moreover there was an effort to obtain foreign trade secrets. Metallurgy for jet fans isn’t one of the technologies the west has tried to partner with China. At this time the UK, the US and Russia hold the lead in that technology -maybe France has some too.
- Tech transfers caught China up, but they then innovated on top of that. They are certainly capable of doing so, they just don't see the need when they can simply use someone else's tech.
- It seems the author started from a desiserd conclusion, and strung together fact(oid)s to support it without any understanding of them, sometimes making huge mistakes.
For example the monocrystalline blades, which are touted as some holy grain, were in production engines on both sides of the iron curtain by the 70s. China has mastered this technology by the 2010s at the latest.
As for airliner engines, I looked up both the LEAP and the PW1000 and their 'hot' part - the turbines - have fairly conservative specs, roughly on par with these aforementioned 70s US/Soviet fighter engines. This is the technology tha's more or less shared between military and civilian engines.
The big Western advantage comes from manufacturing the bypass fan - the composite blades and the high-speed gearbox connecting them to the jet 'core' are technologies that the West has a huge lead on and that's why the reason comparable Russian and Chinese engines don't exist.
But strictly speaking, that's not really directly related to the tech in the turbine 'cores' which most people refer to when speaking about jets and not a peep is made about this in the article.
- Material sciences needed for modern jet engine blades are a closely guarded secret, and thanks to not manufacturing them in china, those secrets have managed to remain not stolen.
Fun story: it is not just jet engines - it is only recently that china was able to actually make indigenous ballpoint pens https://www.bbc.com/news/business-38566114
- It is not the pen, it is the pen tip. Ballpoint pen tips are microscopic tungsten carbide ball held inside ultra-thin steel sockets. So you need cutting tolerances precise to 0.001 millimeters. If the socket is a fraction of a micron too loose, the ink leaks. Too tight, and the pen won't write.
Source from al-Arabiya: https://english.alarabiya.net/variety/2017/01/14/At-last-Chi...
The point (no pun intended) is that China was beginning to crack the processes for making the precision machine tools that make machine tools.
- The ballpoint pen was invented in 1938. It doesn't rely on any arcane manufacturing technology.
- I am 47 and ballpoint pens have visibly improved since the 1990s, at least the cheap ones (never had an expensive one). The risk of accidental staining is by now basically zero, it used to be high enough that you avoided putting a pen into your shirt pocket even for an hour.
- Hence the fading away of the "nerd with pocket protector" stereotype...
- They are not microscopic! I can easily see the balls in the tips of ballpoint pens.
- The BBC article even mentions that they are milliscopic, not microscopic.
> 2.3-millimetre
- China's ballpoint pen quality as a reflection of manufacturing quality:
" China's inability to produce a complete, high-quality ballpoint pen came to widespread attention in 2015, when Prime Minister Li Keqiang singled out the products at a seminar in Beijing, noting that his writing was "rough" when he used Chinese-made ballpoint pens. For Li, China's failure to manufacture a complete ballpoint pen was indicative of the Chinese economy's weaknesses. "That's the real situation facing us," Li said at the time. "We cannot make ballpoint pens with a smooth writing function." "
https://www.smh.com.au/world/finally-china-manufactures-a-ba...
- You fell for a meme that was tired years ago already (your link is from 2017, after all). The article itself notes, “Relatively low-value items, like ballpoint pens, have not been a priority”, so obviously this says little about higher-priority military and industrial areas to which the CCP devotes greater effort.
- Ball point pens are surprisingly high precision items. Making a good ball point pen is not easy.
- is it really a tired meme?
its a clear prioritzation choice from the government, and that prioritization is itself a technology
notably this same prioritization mode resulted in the soviet union failing to produce quality of life improvements for its citizens.
the failure is that the CCP is unable to prioritize making simple useful stuff
- Have you been to urban China anytime after that 2017 article? The country is now as developed as anywhere else, indeed it feels like it is gradually overtaking other developed countries. The comparison to the Soviet Union feels ridiculous to anyone with a firsthand experience of the country.
- The political push in the US to cling to legacy fossil fuel technologies feels to me more Soviet-like if anything.
- Not really, the Soviets pushed all sorts of new transportation and energy generation ideas, not to mention nuclear.
- What country do you live in, and are they currently capable of making ballpoints?
- It's not even that. You can have all the designs you need, but you also need a bunch of downstream tech to get from drawings to production. This is something that centrally planned economies struggle with. You can't 5-year-plan your way to jet-engines if you haven't previously 5-year-planned for all the auxiliary infrastructure needed to support that.
We already know this was an issue with the soviets, back when they had the plans for us jet engines (for fighter planes), but couldn't replicate them. Same for stealth, hell even some of their rocketry. And the soviets had plenty of auxiliary systems already in place, during the cold war. As someone said above, they could do quantity, they could do limited high-quality, but couldn't do both at the same time.
There are things that work with 5-year plans: railroads, road infra, buildings, etc. And there are things that are not that easy, and take multiple decades from when the order comes to having it realised. Something that's not immediately obvious for western folks is that when you mix central planning with authoritarian governments, you will get a huge number of pain points along the way, where orders come downwards towards the ones executing them, and overreporting/missrepresentations/lies go upwards. It's like the longest game of telephone, where you start from the top, demanding x y z, get reports that you're on your way of getting 3x, 3y, 3z and in reality you have some of x, none of y, and z looks like z but it's actually three x's in a trench coat.
- This is of course exemplified by the joke - what's the famous Soviet machine that cuts wood into two pieces? One that cuts wood into three pieces.
- Isn't China currently among the leaders of material science with lots of top 10 universities located in China? [0] (in rankings that do not incorporate prestige but actual scientific output)
[0] https://scholars-stage.org/china-and-the-future-of-science/
- its difficult to see from the lens of software and information technology, and open source academia, but physical science is often discovered via experimentation and cant just be brute forced. usually it disseminates as it is adopted into industrial process and is then copied. a lot of scientific discoveries are made due to impulsive-creative intuition
for example: - until the end of ww1 the haber bosch process was confined to germany
- jet engine turbine blades today
- most historically: https://en.wikipedia.org/wiki/Greek_fire , medieval napalm that nobody has been able to replicate even now
- Quantity isn't quality.
- Isn't having universities in global top10 actual quality?
- Where are the jet engines?
- In the making I'm sure. It's really naive to think that jet engine is challenge that won't be overcome.
- All I know is that they produce a lot of engineers, while the US produces a lot gender studies majors. I rarely say it, but I do not foresee much that they won't be leaving us sharply behind on soon, other than poverty and homelessness, which we have pretty well covered.
- I think your understanding of the numbers is multiple orders of magnitude off. Looking at a recent year (2024) in the US, the total number of "Area, Ethnic, Cultural, Gender, and Group Studies" majors graduated 11961, whereas "Engineering" was 193,458 and "Engineering/Engineering-related Technologies/Technicians" was 83,665.
From: https://nces.ed.gov/ipeds/SummaryTables/report/360?templateI...
- There are about as many gender study majors in the U.S. per year as there are aviation engineering majors. That is one small niche of engineering majors that includes all of gender study.
- That's actually pretty bad. The rest of the world is very willing to spend money on American aerospace products and services.
Is it willing to buy gender theory from you for similar amounts of money? If not, the production of specialized majors should not be 1:1.
- Even in our "productivity at any cost" society, sometimes people still study things that they find interesting. That's probably a good thing, in the long run.
- Scale matters, and there are aftereffects on the society as a whole.
Historically, societies which produced a lot of ideologically minded professionals (such as clergy), tended towards implementing that ideology top-down. I am on board with Turchin's theory of elite overproduction here, and gender studies is modern equivalent of catechism.
To choose a less ideological example: personally, I love Egyptology, but I would be a strict opponent of producing as many Egyptologists as aerospace engineers. Chances are that the superfluous graduates would push for an Egyptocentric department in every public institution and half of private ones.
- There are three times as many religion and philosophy majors as ethnic and gender studies majors. If you are worried about ideologically minded professionals, there are bigger fish to fry.
- Oh, sure, I would fry them all together.
- > Chances are that the superfluous graduates would push for an Egyptocentric department in every public institution and half of private ones.
Better that than, say, the business school.
- Do you think its zero sum? We could just put all the gender studies students into engineering and expect them to thrive there?
- I guess I can relax and stop worrying that we're falling behind a bit. But I do wonder what the numbers really are, and just how many engineers we produce compared to China, of course, without qualifying everyone that learned Visual Basic as an engineer, unless, of course, that's where they're actually getting their own numbers from.
- Seems they have figured out the single crystal blade tech https://interestingengineering.com/innovation/china-crystal-...
- From the article:
> DD6 is a second-generation nickel-based single-crystal superalloy developed by the institute with fully independent intellectual property. Its chief engineer, Li Jiarong, said the alloy’s performance matches or exceeds that of comparable second-generation superalloys used in Europe and the United States, at a lower production cost.
US manufacturers have already developed sixth-generation SC superalloys and most Western airlines are on engines with third- and fourth-generation materials.
The technology behind single crystal superalloys is relatively well understood, the problem is getting the process reliable enough to be economical in an industry that requires tens if not hundreds of billions of dollars to develop through trial and error. The TFA's point is that unlike EVs or semiconductors, the turbofan industry is between a rock and a hard place that China's other successful industries weren't.
- TFA = The Featured Article/The F**ing Article
- The word is "fucking". We’re grown-ups, we can use grown-up words.
- Can Chinese companies order just the blades from RR or P&W?
I've watched their manufacturing video recently and shocked how much of it was hand labour - it's not something I'd associate with precision. My partner said they must know better tho lol.
- The RR video showing manual assembly of wax molds is a low volume development line. It isn't their main production process.
- I've seen that video. Guaranteed they wouldn't have put the slightest bit of information in there if they thought would help the competition.
- They can order engines from RR or P&W
But those companies have no commercial interest in supporting a Chinese manufacturer that just wants the blades even without export controls, when they can make much higher margins selling whole engines that must be maintained using their parts (in practice variants of the engines destined for COMAC also omit some of the IP that finds its way onto Airbus and Boeing because you can help a customer too much...)
- recently? and you posted an almost 10yo article?
- yes, compared to the length of time ballpoint pens have existed (88 years -- since 1938), this is very recent - only 9 years ago
- > It may be surprising, then, that in jet engines, China remains at least a full decade behind the West
Do they need to be at the same level as the West?
For civilian aircraft a decade or two behind seems like it would be good enough.
For military aircraft that could be a significant disadvantage, but from what the net is telling me they have excellent air defenses so it seems unlikely someone with superior planes is going to be able to go in and bomb them into submission. And they have a lot of nuclear missiles to further discourage anyone from trying.
- > they have excellent air defenses so it seems unlikely someone with superior planes is going to be able to go in and bomb them into submission.
You seem to believe that China's military ambitions are purely defensive, but that is not the case. They have grandiose expansionist ambitions which include basically the entire South China Sea - which in spite of its name is shared by many countries. Not to mention their explicit goal of eventually conquering Taiwan. Their military doctrine is fundamentally offensive and does require air power.
- But interestingly their ambitions are "local". This has a large impact on the machines and materials required.
In other words, let's says the Chinese military jet engine is 15 years behind is say fuel economy. Which reduces range. If the conflict is local that doesn't matter overmuch.
Equally operating from land, not carriers, reduces reach, but if what you want to reach is local then that doesn't matter.
If China has military ambitions (and despite the sabre rattling there's no overt indication of that), they are all in a specific area.
By contrast the US likes to participate in, or instigate, actions far from home. Moving planes means long open-ocean ferry flights. Single-engine reliability, range, effeciency and so on is paramout.
Equally the US relies on friendly local countries to provide support bases, logistics, fuel and so on. As evidenced just this year, that support can be withdrawn. Will Japan or Korea want to be dragged into a US / China conflict over Taiwan?
So if the Chinese are operating engines later than the first gulf War, and on par with the second, I'm not sure that's a defining difference.
The US doctrine of air-defence suppression followed by air superiority may not be possible in a space near the Chinese mainland.
- In a military context, the main technological gaps relating to jet engines are supercruise and maintenance hours. Both are potentially quite relevant in a ‘local’ conflict.
- I'm not sure about maintenance hours. That matters as a function of proximity to maintenance staff, parts, new supply and so on. Flying from home bases, with no shortage of skilled labor can cover that.
Supercruise also matters a bit less when the distance to combat is shorter. Less fuel expended on "getting there" is more fuel for "on station". Plus, assuming more-or-less unlimited supply of machines and pilots means more flight hours on station.
So while the engines play a part in a hypothetical conflict, supply lines (and the length thereof) play (I think) a larger part.
- I think you vastly underestimate how maintenance requirements impact how rapidly you can bring forces to the fight and how long you can keep them there. While that is exacerbated by long supply lines, it is an extremely important factor in any combat scenario.
- It matters for combat readiness.
The F-35, which was optimized for congressional district employment, has an effective 25% readiness rate (another 25% can fly but not fight), which is half of the 40 year old F-15C and 1/3 the newer F-15s.
- Supercruise matters directly for BVR combat. It means that you can get high and fast to launch your missiles with the best parameters without burning half your fuel via afterburners. (Many fighter jets would burn through all their fuel in under 10 minutes at full afterburner.)
Maintenance hours are sure to matter in a real war where equipment is getting destroyed and supply lines are being disrupted.
- Given a generous enough definition of "defensive", maybe
- If you want to sell commercial jets to anyone who isn’t Chinese, 20Y old engines aren’t good enough because modern engines are slightly more fuel efficient.
The difference isn’t huge (I think it’s 10-20% or something), but when fuel is your main cost that’s enough to make older engines undesirable
- The GEnx which powers the 787 is a 20 year-old engine design. There are thousands of jets flying around with 40+ year-old engine designs, especially in operations like charter and cargo where the aircraft spends more time on the ground than in the air. At the right price a 20 year-old design would be quite viable. Which indicates China is much more than a decade behind.
- I mean, the "right price" for a 15 year old 787 (with a fresh new set of life limited parts and maintenance checks) is around a third of the cost of a new one and they're now starting to be parted out for their components (newer 787s have updated GEnx engines with better fuel economy, which is a big part of their higher value). And Boeing reckoned they needed to sell 1100 units to break even on the programme, which is a lot aircraft to sell if your design is only competitive with 15 year old aircraft airlines are trying to get rid of. People are already starting to breaking up old 787s for scrap because there are more buyers for spares than old 787s...
China may or may not be much more than a decade behind in their engine technology, but there's no commercial case for designing a new aircraft with engine variants so outdated they wipe >$100m off the sticker price of the aircraft....
- > The difference isn’t huge (I think it’s 10-20% or something)
A 10-20% reduction in fuel burn is actually considered pretty huge...
- What from I understand the issue is mainly service frequency rather than fuel efficiency.
Also, the domestic commercial jet market is still sizable, so excluding the domestic market from analyses is kinda weird.
Finally, lots of countries are spooked by arbitrary US sanctions and want to diversify.
- Yes I think eventually they will catch up because the Chinese domestic market is big enough to give them a market while they iterate.
With petrol/diesel engines they just gave up and went straight to electric, but there's no viable alternative to jet engines for planes, so they'll put in the work (plus the military incentive running in parallel)
- > no viable alternative to jet engines for planes
No, but regional aviation can be well served by electrification - a jet engine needs to run at a speed it pushed enough air through itself to propel the plane forward, but a turbine feeding a generator that powers a couple electric motors can run at a far more forgiving regime.
As pointed out elsewhere, all it might take is a paradigm shift to unseat the current incumbents.
- This is the part I don't understand about chip export restrictions; the argument used is that high-end chips would be used for high-tech weaponry, but most weapons don't need high-end chips, 2-5 generations old chips are good enough for most smart weapons. I mean the Tomahawk is from '83, the HIMARS from the late 90's, etc. I don't believe that high end, small process chips are used in any weapons right now.
The only use case is modern day AI workloads, but that's used more in planning than in the field. I can imagine a use case for e.g. image recognition, but again, that tech or the level required is not new at all and doesn't need state of the art chip tech.
- Weapons systems like the Tomahawk and HIMARS are continually evolved, especially the electronic systems like navigation and command+control. The iteration isn't nearly as fast as in other industries, but the modern incarnations are not 30+ years old, AFAIU, old stockpile notwithstanding.
That's also why they're so damned expensive, and why it's difficult for upstarts to break into the market with cheaper alternatives. Like any tech company, once they get the customer locked into a platform they're constantly pushing upgrades to both stay technologically competitive and, more importantly, keep their margins high.
- They do spying to understand the capabilities of allies and adversary weapons. The goal is to maintain supremacy and slow down development. The US had a spy in the Soviet era that provided the entire Soviet radar roadmap into the 1990s, and technology was deployed (or not) based on that.
That’s one of the reasons drones are so disruptive. The development cycle is tuned by state of the art missile and stuff, and isn’t tooled for some dude strapping a mortar round to a little drone.
- It's kinda opposite in a way. More countries make military engines than commercial engines because military engines don't have to worry as much about efficiency, pollution, sound, and most importantly cost.
But unless you massively subsidize a company "cough Rolls Royce cough" then you can't compete at all with a generation or two behind commercial jet engine tech.
- >they have excellent air defenses
in which conflicts have those air defenses proven themselves?
- For cruise missiles couple hour blade operating life is also a non problem.
- > And jet engines do not have any lower-tier market with underserved demand
They actually do. The segment of small jet-powered (military) drones is rapidly growing and isn't served by the big jet engine manufacturers.
- If there was ever a sector where the Chinese ability to cost effectively churn out good enough then drone applications are it.
Getting a handle on how nations are doing for jet powered drone is a bit tricky because of limited data available for what is primarily a military application. But, if we take model aircraft applications as proxy, then my understanding is that the Chinese company Swiwin (est. 2013) is already undercutting everyone else.
- Veritasium made an episode not long ago describing the design and manufacture of turbine blades:
- While I think the scale of American decline is overstated, I think there is a degree of Hemingway's law of motion.
A desired task that requires the most skilled makes those skilled people in demand. If a power has significantly more resources then they have more to offer those most skilled people.
It isn't at all disputed that there are a huge number of scientific discoveries that have occurred in The USA by people born outside the USA. That shows the draw of that power, but it is a relative draw. As the ratio becomes smaller the draw is less.
Advances like this are a feedback mechanism, being ahead gives you more resources to stay ahead.
If you consider the average contribution of advances to be a relatively steady force advancing a nation, yet a nation is in decline, it stands to reason that the decline is in another area and is being mitigated by the advances.
If the force propping things up goes somewhere else the change can be quite swift because the force of the decline becomes suddenly much more apparent.
I don't see the world going full Mad Max, but I can certainly see a sudden shift to the USA being considered no different to the UK,Japan, or Germany.
- “America is in decline” is the consensus view. America dominating on all fronts is the contrarian view. I expect these views to swing like a pendulum in public discussion until something meaningful happens or until it’s clear in the rearview that America is in fact is more like UK, Japan, or Germany.
- Certainly that's the consensus view. However, I have yet to see any evidence that people within the consensus actually have done any analysis to find the truth. They just have sort of feeling which is driven by the press which presents a story.
- I think it's less that America is declining and more that China is rising. And really, most of the world is getting richer.
- Just to add, the primary failure mode of critical jet engine components is fatigue. To see, and thus learn, from fatigue failures in the field you need thousands of components flying thousands of hours, this takes years or decades. And to learn from this in a way that let's you improve design you first have to get past manufacturing and maintenance induced issues. Which is to say, it takes time to get good at jet engines, on the order of decades when you are talking about the tightest margin sector of the field (big commercial engines).
- You can read about China's modern carrier-based, stealth fighter here: https://en.wikipedia.org/wiki/Shenyang_J-35
There is a section about its engines: https://en.wikipedia.org/wiki/Shenyang_J-35#Engines
The first engine they used for the J-35 was the RD-33 (designed/built in Russia): https://en.wikipedia.org/wiki/Klimov_RD-33#RD-93 - It was not efficient enough for the J-35 and generated black smoke trails. China decided to design & build a China-based engine.
This is the engine for the early J-35 prototype, WS-13 built in China: https://en.wikipedia.org/wiki/Guizhou_WS-13
This is the production engine for J-35, the WS-19: https://en.wikipedia.org/wiki/Guizhou_WS-19
China has built 50+ J-35 aircraft, and is scaling up production to support their domestic military, and also export orders to other militaries (including Pakistan, and possibly Russia).
Interesting: This is China's latest aircraft carrier, which has electromagnetic catapults, instead of steam-based: https://en.wikipedia.org/wiki/Chinese_aircraft_carrier_Fujia...
You can see videos of the J-35 aircraft here: https://www.youtube.com/watch?v=oLdCNAUjuRI
- In fact, after the RD-33 switched to electronic controls, it no longer produced black smoke (roughly 20 years ago).
- I think part of it comes down to trust. GE can trust that metal alloy from its supplier will not be substituted, etc. They still have to manage quality but they don't have to vertically integrate just to get the level of quality they need.
- A key question in assessing China’s development of indigenous turbofan engines for commercial aviation is the addressable market.
In the near term, it is highly unlikely that Chinese-made engines would be adopted by Boeing or Airbus, given certification barriers, supply chain integration challenges, and broader geopolitical considerations. As a result, the primary initial market would be China’s domestic commercial aircraft programs.
However, the scale and timing of that demand remain uncertain. Early production volumes for programs such as the C919 are relatively limited, and initial fleet sizes alone may not be sufficient to amortize the substantial research and development costs associated with modern turbofan engines. This raises questions about the commercial viability of such programs in the absence of broader international adoption.
China’s civil aviation industry is still in a relatively early stage of development. The C919, its first domestically developed narrow-body jet, has completed test flights and entered initial service with Chinese airlines. At present, it relies on engines supplied by GE. A critical milestone for the program is obtaining international airworthiness certification, particularly from U.S. and European regulators, which would enable broader global operations and improve export prospects.
If such certifications are achieved, potential demand may emerge from developing markets, including Southeast Asia and parts of Africa. Nevertheless, penetration into North American and European airline fleets would likely remain limited for the foreseeable future, even if existing Western-supplied engines continue to be used.
Recent export control measures—such as U.S. restrictions on the sale of certain engine technologies—highlight the extent to which geopolitical factors can influence supply chains in the aerospace sector. These constraints have, at times, affected delivery schedules for aircraft programs like the C919.
In this context, China’s push to develop indigenous engine capabilities can be understood as a strategic response to external dependencies. Similar dynamics have been observed in other high-technology sectors, including semiconductors and advanced computing hardware, where supply chain resilience and technological self-sufficiency have become increasingly important policy objectives.
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- > The USSR, now Russia, entered in the 1950s, when the technology was still new and the Western advantage was much smaller, and they still, over their entire history, did not produce a civil or military engine that had parity with West.
Interesting reading. Sadly, once I encountered this, I realized the article was extremely biased. The USSR successfully achieved this several times.
I suspect this article will age badly after WS-15 goes live. China has significantly narrowed the gap.
- Do you mean WS-19? It gives 2023 as the production date for WS-15, which is in the past.
- By going live, I meant when WS-15 is integrated with J-20 rolled-out in a fully-operational and mature manner. This is expected to substantially close the gap with top U.S. fighters in raw propulsion performance.
- This is also why China has heavily invested in high-speed rail. Even today, many people who are influenced by persistent misinformation and years of criticism toward China continue to question its high-speed rail system, asking why China doesn’t follow the U.S. model of relying on cars and airplanes instead. But China’s limited ability to rapidly scale commercial aviation means it would have to purchase large numbers of aircraft at high prices to meet domestic passenger demand, while also keeping ticket prices low. That is fundamentally not feasible. In this sense, high-speed rail is China’s only viable solution. Even though many lines are not profitable on a strict accounting basis, the enormous social and systemic benefits make the investment worthwhile.
This is somewhat similar to the camera industry. It is a shrinking market, while iterative improvements in smartphone cameras are where the real economic returns are. This is why the traditional camera industry remains dominated by Japan, while China has gradually captured adjacent markets such as smartphones and products like DJI. Of course, the barriers to entry in traditional cameras are not as deep.
As the article suggests, China is mainly “late” in certain areas. The industries are not always large, the profit pools are limited, and compliance requirements can be cumbersome. In this sense, the Chinese government does not seem to have made any major strategic mistake here. The current pattern of catching up and lagging behind is largely predictable. Unlike in high-end semiconductors, I do think China has made significant mistakes here. In state-led industrial programs of this kind, a lack of market discipline and episodes of corruption scandals have repeatedly slowed progress and led the government to become more cautious. However, given that China already holds a dominant position in mid-to-low-end semiconductors, the overall outlook may still be optimistic.
Since it is currently World Cup season, Chinese football is another example of a similar structural issue. The system is simply deeply broken and incapable of properly identifying and cultivating top talent.
- China has invested into high-speed rail for the same reason that Japan, France and Spain did: the big cities tend to be in the "sweet spot" distance of 250-750 km from one another, which is very comfortable to ride in a high-speed train.
Distances over 1000 km are already favorable for passenger jets. Even in today's Western Europe, there just aren't that many really long distance trains (by which I mean something like Amsterdam-Barcelona or Copenhagen-Milan).
- Beijing - Shanghai is about 1200 km. HSR has a 70% market share. The trip takes 4.5 hours.
The only real reason you would fly this route would be as a connecting flight. But if you just want to travel from Beijing to Shanghai, HSR is the obvious choice. It probably takes less time overall, and it's way more comfortable. You can even order takeout from restaurants along the way, delivered to your seat.
- that's the result, not the reason
- Can you expand your argument?
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- Furthermore we should thank the amount of fossil fuel and CO2 reduction that HSR has given, or the planet will be really in trouble.
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- There is a lot of black art stuff in jet engine manufacturing, but if this article is supposed to be reassuring to Americans, it's not to me. They're saying that China was 21 years behind on the previous generation of engines, and they're going to be 7 years behind on the next one. That sounds like they're catching up pretty fast.
I don't know where they're at in terms of civil engines, but each new generation of engines eeks out less and less additional performance. If China comes out with something like the CFM LEAP at a good price, I'd imagine they could sell that for many years to come.
- Jet engines are far more high-tech than most people imagine, but I'm not convinced this is evidence of some inherent Chinese weakness. The obvious explanation is that China started much later in an insanely difficult field.
They are narrowing a gap measured in decades. The article explains the difficulty well, but it doesn't convince me that China can't eventually (again, given enough time) build good engines, especially for domestic military use.
Same for semi-conductors, IMHO.
- I know it's not the point of the article but wow I learned a lot about metallurgy and kind of fell down a rabbit hole. Great stuff
- Outdated copium TBH. PRC engine programs going smooth last 10 years, doing their on variable bypass programs as well.
Turbojet/fan core programs bottle neck isn't technical, its political / organizational, assuming some base pop scale, i.e. need to sustain specialized aerospace workforce of a few 100k which most countries can not - and EU has to as bloc - but trivial for PRC. What's hard is building the entire process / development pipeline etcs. Tremendously expensive and takes political will to sustain, with little expectation of returns, over 10-20 years. This was last piece PRC was building out post 00s, which basically caught up ~50 years in ~10 years for military hot section... aka one should expect rapid catchup in civil aviation if PRC serious. As if PRC not good at parallel iterations and tacit knowledge buildup at PRC scale. But IMO civil aviation not PRC serious/priority, nothing that increase reliance on fossil is.
The other caveat is commercial aviation is deeply geopolitical, PRC can very well have competitive engines and still have difficulty commercializing because west currently has chokehold on regulatory/certification. Half the reason COMAC went with western components is due to ease of certification, really if PRC wanted right now, they can plug Y20 avionics / components into domestic narrow/wide body (turbojet not 1:1 price/perf swamp with turbofan) but the point is PRC at point where if they wanted completely indigenize domestic civil aviation with eye on medium/long term global expansion, they could.
Other thing to consider is "commercial" viability of jet engines is pegged to oil price, i.e. aviation fuel opex at current prices means marginally more performant engines (5-10% better fuel efficiency) will economically pay themselves off over lifespan at recent fuel prices. If aviation fuels dips to historically precedented lows, PRC ability to involute component prices to commodity levels can become competitive, i.e. the economics of spares/maintenance of having lower priced hulls > fuel price.
But ultimately, formula for frontier capabilities is basically having industrial policy that can eat a lot of losses during incubation while generating/coordinating the required talent.
- Assuming China has spent 50 years already on jet engines, yeah. All these article just write off China.
Rote learning, no democracy. Proper jet engines WILL come out of China soon. lol. Just watch this space.
- This may be a stupid question - but can't China just buy some airbus/boeing planes, take the engine apart and then manufacture each part as is?
- Alegedlly they tried, but Airbus didn't fall for it. Search for "Ghost plane Airbus A320 C919" if you want to expand. It is a case of "we have no proof, but we have no doubt": China buys a bunch of A320, one of them disappears and never flies. After some time, a A320 clone C919 appears on their market.
- Well at least they bought and didn't rent for 6 weeks, dismantle, reassemble and return....
https://qz.com/1146259/mercedes-got-caught-trashing-a-rental...
- Chinese firms already manufacture parts of Rolls Royce engine. I think Wuxi Turbine is one example
- No. They do this of course, but with jet turbines the materials science and processes aren't deducible from the work product.
- The manufacturing is really deeply gnarly. Like crazy materials you'd have to reverse engineer the production process for, then reverse engineer how to form the blades so they'll survive insane loads for thousands of hours of operation without failure under extreme temperatures. It's like saying you can make a MacBook chassis because you have a block of aluminum, some hand files, and an Adderall prescription.
- Minor nitpick: Rolls-Royce military jet engines are made at Bristol (ex-Bristol Aerospace), but civilian turbines like the Trent series are made in Derby.
- For as long as the article is, surprised that it neglected to mention that the WS-10 started as an unlicensed copy of the CFM-56.
- If they can build rocket engines they can build jet engines.
- meta: isn't there a long history of such retrospective analysis where when a country does well economically, it's due to something in their culture?
- this interview also talked a bit about the reasons its hard for get turbines to be manufactured in China, but coming at it from the gas power generation side. https://www.decouple.media/p/the-gas-turbine-the-final-revel...
- There are 200 Chinese industrial engineers, 8 Chinese bankers, and 1 Goldman Sachs disciple of Hank Paulson, reading this right now thinking of ways to chip away at sentence in this paper.
- Probably the most head in the sand mil-tech article I've read in long time. There are very few explicit claims the author makes about Chinese capability that can be addressed, most of it just gesturing at anecdotes or vibes.
The author does not notice that the F-35 is a single engine jet rated for VSTOL flight characteristics. The F135 is required to produce that much thrust by itself to support that profile. The J-20 is a twin-engine fighter. Why, pray tell, does the engine designed for a twin engine, land based fighter designed for carrying large payloads of air to air munitions need to beat the thrust of the F135? The comparison is worse than stupid.
The Chinese Flanker fleet is being built out and maintained at scale with WS-10s, it's industries churn out 100-120 J-20s per year, all with twin WS-15s. This is a mature jet engine capability, at massive scale. "Not made in China"???
The author makes a passing comment that the WS-15 is "outdated" compared to NATO forces. They are clearly blissfully unaware that the F-18 Super Hornet standard runs the F414 powerplant, as old as the WS-15, itself an upgrade on the F404 powerplant, 50 years old now. The F-18F is the USN's mainline pacific theatre fighter.
I honestly believe anyone who considers the Chinese jet engine program to have been a failure to have perhaps lost some marbles along the way. It demonstrably is not, unless you think the PLAAF is about to collapse midair, a notion their daily ADIZ violations and interceptions over the SCS and the Taiwan straits should thoroughly disabuse. My prediction is by 2037 the entirety of Chinese domestic civil aviation will be running the C919 and they'll be a serious competitive threat to Airbus and Boeing.
- Counterpoint: modern fighters need higher-performance engines not just for thrust but also to run and cool more and more electronics. Arguably both are underpowered from where they need to be.
- Russia has just finally declared achieving full "import substitution" for Superjet-100, a regional jet so badly needed in Russia and the first Russian plane to be produced in decades. With domestically sourced parts the plane is now several tons heavier, and with Russian jet engines it has range of only half of the original non-import-substituted plane, and that makes it borderline unusable as a regional jet for Russia.
"Technological sovereignty" sounds like something smart and glorious ... well, in the 6th grade history classes it was called "natural economy" of the feudalism.
China is 10x of Russia, and thus can build higher technological pyramid - the modern technology in my view is like a pyramid where the complexity of achievable technology at the top is defined by how broad is your foundation. The base of China's pyramid is growing by including more and more of its society into modern technological economy, yet it is still smaller than the Western world's pyramid. The original article exactly describes that the China's pyramid is still of not sufficient height/width for such a complex product like modern jet engine.
- Very informative but there's some key potentialities left unexplored. For example what if a simpler jet engine could be produced based on a future electric battery powered plane. After all the article emphasizes that China exploited the simplification of a new market in the waning internal combustion engine era
- > Each of these companies relies on a deep network of suppliers
Isn’t this by design? ie each country customer has an important stage in the supply chain so that if the primary country fails to deliver, a supply countries can choke global orders
- ... They are making Jet engines. Lots of them.
This article is full of laymen's inaccuracy that indicates the author is not anywhere close to the depth of the field.
> China’s first fifth-generation fighter, the Chengdu J-20B, relied on a thirty-year old Russian AL-31 for a full decade until its domestic WS-15 program, which was started in the 1990s, was deemed ready for production.
There is no J-20B J-20 has been using WS-10C for at least 3-5 years
> China has excelled in industries with legible technological targets, well-known manufacturing processes, and fast iteration cycles.
I cannot believe people still think an advancing manufacturing economy just stops at certain threshold. That's plainly illogical.
Jet engine has legible technology targets. Well-known manufacturing processes. Not-so-fast-in-common-sense iteration cycles.
If I am poor, of cuz I am not have time to make a beautiful suit for myself. I need to first make the house, a shabby one as well. Until one day I started make the suit. That has nothing to do with the suit being less clear targets, processes, or whatever.
> Additionally, there was existing synergy China could exploit. Chinese EV success was predicated on earlier successes in battery manufacturing.
Yes, of cuz, battery manufacturing was considered beyond China's capability before ...
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- I think we all know why nobody risks that. It's because of a terrible quality. But saying so is somehow "holy wars". It is not.
- Cherry-picking individual technologies (such as jet engines) doesn't really say much. You could argue that companies like ASML and Rolls-Royce (jet engines) are evidence that Europe knows how to innovate and the US doesn't. That Airbus overtaking Boeing in a market once completely dominated by Boeing shows the US has lost its edge. That the European-designed ARM architecture winning the mobile phone wars shows the US has lost its chip design advantage. And so on.
But there are obvious counterarguments if you cherry-pick technologies where the US currently leads — Google Search, AI, and so on.
So I would be really careful extracting any kind of simple "truth" from examples like these. Different countries have different advantages, and those advantages shift over time. That's it.
- The framing here is sensationalist.
Going from near zero 40 years ago to being just 10 years behind the state of the art now is actually pretty rapid convergence. Calling that a "failure" is strange.
- Meta. Horizontal/vertical integration/scaling. Terms used throughout the article.
I hate these terms. They always seem so meaningless. Normally those kind of terms grow out of some kind of useful analogy that helps you picture what they mean. I don't find that at all. MBA speak
- This is a fascinating read. I have 3 thoughts.
First, the certification process in aviation absolutely is a massive issue. This was in large part the undoing of Bombardier. Well, that and Boeing successfully getting the US government to put 300% tariffs on them. But one of their go-to-market delays was that they simply weren't set up for FAA's processes and that was a mistake.
Second, I think there's a difference between the China of now and the China of the 1970s. It seems like Deng Xiaoping did kind of throw money at problems. I don't think that's true anymore. Or at least it's far more integrated and thoughtful that it might've once been. The example I'm thinking of is EUV. Go back 2-3 years and you'll probably find a lot of people who would say China won't replicate EUV for similar reasons about the supply chain, interdependence and vertical integration. But we're only a few years away from that now. The author is correct to raise an important factor: local demand. This was the mistake (IMHO) of US bans on exporting the best chips to China: it created a captive local market for Huawei chips.
Third, if I was in charge of bootstrapping a jet engine ecosystem (that's really what it is) given all the very real problems the author raised, how would I do it? I'd to bootstrap the materials side and manufacturing in other industries that don't have the stringent testing and regulation requirements of commercial aviation. Gas turbines, medical equipment, orthopedics, that sort of thing.
- At the start of WW2, the UK was struggling to make enough planes the hand-crafted, coach built way. A deal was done for US automotive concerns, notably Ford, to make British planes under license, en-masse.
Note that this was to be done without Weingarten and other German presses, which were the EUV machines of the era. This was also to be done without the 'Black Country', which was the British industrial heartland centred around Birmingham.
A big problem turned out to be the British blueprints, which were ill-suited to precision mass manufacturing, where fettling is not allowed. Everything had to be redesigned for mass manufacturing.
This redesign for mass manufacturing was evidently outside of the competencies of the Brits but an easy task for the guys at Ford.
Until 2014, China and Russia have genuinely sought trade and cooperation with the West. The deal was hydrocarbons and labour in exchange for luxury goodies, specialist machine tools, avionics and much else, including jet engines. It was win-win, mostly.
However, in 2022 the gloves truly came off. Economic cooperation between Russia and China became necessary. Thus far, there is no evidence of Chinese war material on the front line, other than dual use items seen on both sides such as the ubiquitous DJI Mavic drones. However, there is a deeper partnership going on between the two nations, with aerospace being extremely important.
Already Rolls Royce are making gas turbines in China, for non-plane things. Naturally they hold back the true trade secrets, and the US government absolutely makes sure that is the case. However, you know it is only a matter of time before there are several Shenzhens for aerospace growing like mushrooms in China, blueprints from Russia, re-engineered for mass production.
- > A failure in these blades would be catastrophic, resulting in the destruction of the engine, likely followed by the plane itself.
Aaaaand the author just lost any credibility with me whatsoever. This is someone who knows big words, maybe did some research and ChatGPTing, and doesn't actually know shit about aircraft or their engines.
On passenger aircraft because passengers sit directly inline with the path a blade with insane levels of kinetic energy will probably go, the nacelle is designed to contain it.
The engine must be able to contain a "blade off" event where a blade snaps during full rated thrust. Two videos:
https://www.youtube.com/watch?v=j973645y5AA
https://www.youtube.com/watch?v=wcALjMJbAvU
The aircraft will not be "destroyed."
The blade could fail during takeoff climb and the plane would still be able to climb because all twin engine passenger jet aircraft must be able to conduct all phases of flight on one engine.
SWA 1380 had a passenger fatality not because of the blade hitting them, but because part of the cowling disintegrated, broke the window, and she was partially sucked out of the aircraft, which killed her.
If she'd been wearing her seatbelt, she would likely be alive today. As would several other passengers who, over the years, have been killed by debris breaking the window and them being sucked out.
The blade itself did not leave the engine.
https://en.wikipedia.org/wiki/Southwest_Airlines_Flight_1380
That article lists a number of incidents, in roughly half of which the blade was contained. All the flights made it back to an airport...
- > If she'd been wearing her seatbelt, she would likely be alive today.
The passenger's seatbelt was buckled.
https://libraryonline.erau.edu/online-full-text/ntsb/aircraf...
"When flight attendant C reached row 14, she saw that the head, upper torso, and arms of the passenger seated in 14A had been pulled outside the airplane through the window. The passenger’s seat belt was buckled. Flight attendant C grabbed onto the passenger and, with assistance from flight attendant A, tried to bring the passenger back into the airplane, but flight attendant A reported that they could not get the passenger back into the airplane by themselves because of the pressure and the altitude. Two male passengers (in seats 8D and 13D) offered to help; they were able to pull the passenger back into the airplane and laid the injured passenger across seats 14ABC."
RIP Jennifer Riordan.
- As with all design on aircraft, weight is a key part of the specification. A nacelle that could contain all possible failure modes would be too heavy to fly.
Losing a fan blade, as demonstrated in your two youtube links, is both a more likely event to occur and low enough energy to be able to contain with a reasonable structure.
However consider the situation in [0] where a turbine disk became detached from its shaft. The disk is still taking power from the exhaust gas, but rather using the energy to power the compressor or rotate the fan it is now just increasing its own kinetic energy. This continues until the incredibly strong turbine disk rotates itself apart. From the linked article:
> For engineering purposes, disk fragments are assumed to have infinite energy at the moment of release; they will cut through any reasonable material and cannot be contained
You can see from photographs of the aftermath, the nacelle is missing where this happened
[0] https://admiralcloudberg.medium.com/a-matter-of-millimeters-...
- This is not my understanding by reading the article. The blade failure will destroy the plane if developed independently of the rest. So modern nacelles will contain the blast as you say but they have decades of integration testing together with the blades in all kind of conditions.
if you develop everything anew there will be mismatches in tolerances and thousands of potential individual failure risks that can be combined in interesting, unexpected and fatal ways.
- Shrapnel is an issue, and depends what it takes out.
Take this incident for example:
https://admiralcloudberg.medium.com/a-matter-of-millimeters-...
- Nacelle is designed to contain blades, but a failed blade can break downstream parts and nothing can stop high-pressure turbine disk parts from flying where they want
- A lot of claims in the article.
IDK if the WS-15 failed or is "two decades" behind. I think we just don't know, but we do know that it is that they have achieved the ability to deliver, in mass, third-generation single-crystal nickel-based superalloys. That's a strong proof point.
As for commercial, China can/has grant a sizable portion of the C919 to domestic engine producers ( I think AECC has this contract ) that allows for a lot of capital and practice.
I would not be shocked if China demonstrates highly competitive engines in the late 2020, maybe with a few setbacks and iterations. I would also not be shocked if they started demonstrating engines with some characteristics slightly better than the Western manufactures in that time period (or maybe a little later).
- WS 15 is already shipping with latest J20, its trust to weight ratio is above 10.
- The OP is trying to summarize a 1.4Bn country failure to achieve jet engine in: if you do these couple tricks; or because of these two things.
If you're a small country, sure, that kind of strategy might make sense. Pick your battles, run the country like a startup (i.e. bet on one or two industries). China's strategy is the opposite of that: just make production costs low across the board (transport, energy, housing, etc.) and let everything else follow. With 1.4 billion people, something somewhere is bound to pop off.
People are reading way too much into the 5-year plans. It basically boils down to "do science across the board, but lean a bit more into these areas."
- Almost everyone at the top of the CCP has an engineering background.
So yeah their five year plans are indeed often “Invest in science/engineering”, they are an interesting country.
- Is that really that interesting? Imagine giving a bunch of tech nerds some funds and freedom to do whatever. The end result will be software/tech (whether the product is useful is actually another story).
- wow, this was a fantastic, fascinating read
- the structural disadvantages that the article points to, long iteration times, weird inside baseball materials science and tacit knowledge in manufacturing are real but the author is wrong to dismiss the scale.
Scale doesn't help them much in getting the engines up to quality but it does give them the ability to run dozens of experiments and companies at the same time. And they only need to have a handful of breakthroughs once.
That's a pattern that's already repeated it a few times, China has had trouble catching up in the car market for a long time, on semiconductors. On the first they're now on their way to capture the market, on chips they're catching up, and on military engines you can already see the gap closing. I predict the title of the post will age badly, within 5-10 years there'll be competitive commercial planes in China.
- > When it takes months to determine whether a single change has produced a positive impact, directional intuition is critical to faster development, and that lives entirely as tacit knowledge amongst generations of aerospace, materials, and mechanical engineers.
... and implied by that is that no one who holds that knowledge is going to be braindead enough and go and help China to destroy their industry just like they did with everyone else.
- ..Yet.
- another reason why China can't build jet engines: the jet engine manufacturers never relocated their manufacturing to China, which therefore prevented the Chinese from getting their hands on their IP.
it's well known that the way China dominated in solar panels was by "transferring" (aka stealing) the IP from US solar panel makers who had foolishly set up shop in China to reduce costs, and ended up going out of business once Chinese companies got the IP and was able to use their resources or gov subsidies to undercut on price.
I'm not saying that this is always been the reason for China's ability to quickly catch up but it is definitely a factor. Anyone who has worked in China (as I did for a number of years) knows that IP is not safe there (it's not just foreign companies who experience this, Chinese companies find their IP copied by other Chinese companies), and the courts provide almost no help to foreign companies (this may have changed as of 2017, when I left China, up until that point no foreign company had won a significant court case against a Chinese company in a Chinese court).
- Chinese solar technology is multiple generations ahead of US companies. First solar panels have a conversion rate of 17% while longi is 24.8% and demonstrating 26%. First solar should be out of the market without US government subsidies and protectionism.
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- Can you please make your substantive points without breaking the site guidelines? You broke quite a few of them with this post.
You're welcome to express your views thoughtfully, but not aggressively. If you wouldn't mind reviewing https://news.ycombinator.com/newsguidelines.html and taking the intended spirit of the site more to heart, we'd be grateful.
- the one thing that this article leaves out is very obvious and simple: culture
when you don't have an environment where truthful valid opinions or facts are allowed to freely be tested and communicated you simply can't build anything complex that requires strong individual integrity and honesty.
jets aren't the only stuff that China cannot make. Semiconductors are also a great example.
- China has an incredible engineering culture. If you think their meteoric rise is accomplished without being able to share opinions or facts you’re very much mistaken.
To imply they lack “individual integrity and honesty” is misinformed, deluded, and likely racist.
- reaching for racism over what is an obvious gap in cultural and political environment is just lazy
if China has such incredible engineering culture where are the jet engines? semiconductors ?
