J-20 5th Generation Fighter VII
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Hi what can be the 26 in the cockpit can be number of assembled fighters if possible to answerA clearer glimpse of the cockpit. A previous version was much grainier.
thank you
Pardon, but this in pure fiction!
Neither does the Chinese press - and especially no official one - confirmed any numbers nor do we have any confirmed planned and actual numbers. So to assume there is a lag in production of 37% is pure fiction.
Eh, topwar.ru does not seem to be all that reliable with regards to PLA watching.
I did read that rumor that the WS-15 engine prototypes had performance loss at high temperature before though.
"Russian sources report the WS-15 experiences “a sharp drop in thrust when the temperature of the turbine section approaches the maximum operating parameters. The engine experiences this fall-off when the temperature exceeds 1350 degrees Celsius with this drop in initial versions of the engine reaching as high as a 25 per cent.” A catastrophic performance flaw for a pilot in the middle of a fight.
The Chinese design team has reportedly tried different alloys for blades used in the engine’s hot sections, but have managed to reduce the drop in thrust to only 18 per cent, which is still unacceptable. The same Russian sources also state that when the afterburner is engaged fuel accumulates in the engine and does not ignite properly. (This assertion appears to be confirmed by a long-range photo taken of a J-20 on the ground at Chengdu dumping fuel from the exhaust nozzle section.)"
But that article at breakingdefense.com also has its fair amount of errors. Like stating that Motor Sich is the only engine designer who can develop a new engine front-to-back on their own from the former USSR space. Which is patent BS. How did Russia design the AL-41 and the PD-14 then?
I did read that rumor that the WS-15 engine prototypes had performance loss at high temperature before though.
"Russian sources report the WS-15 experiences “a sharp drop in thrust when the temperature of the turbine section approaches the maximum operating parameters. The engine experiences this fall-off when the temperature exceeds 1350 degrees Celsius with this drop in initial versions of the engine reaching as high as a 25 per cent.” A catastrophic performance flaw for a pilot in the middle of a fight.
The Chinese design team has reportedly tried different alloys for blades used in the engine’s hot sections, but have managed to reduce the drop in thrust to only 18 per cent, which is still unacceptable. The same Russian sources also state that when the afterburner is engaged fuel accumulates in the engine and does not ignite properly. (This assertion appears to be confirmed by a long-range photo taken of a J-20 on the ground at Chengdu dumping fuel from the exhaust nozzle section.)"
But that article at breakingdefense.com also has its fair amount of errors. Like stating that Motor Sich is the only engine designer who can develop a new engine front-to-back on their own from the former USSR space. Which is patent BS. How did Russia design the AL-41 and the PD-14 then?
manqiangrexue
Brigadier
Why would a Russian source know these things?
Isn't this problem easily solved by calibrating the fuel injector to inject less fuel? And this claim also would mean that WS-15 has already been mounted onto a J-20, which I believe definitely would not happen if it was still having these issues on the lab tests. Not even for taxiing tests but turning on the wet thrust means it was surely in the air. It would be crazy to flight test these engines on a J-20 if the problems were so glaring.
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Maybe they quoted an unverified Indian source.
If it is even a Russian source to begin with. I just posted that here because it seemed relevant.
Also it seemed awfully specific so if it isn't true or it is old information, which might also be the case, it would be easier to cross check.
For what it's worth you don't need to be in the air to test the afterburner. Just think about it. You can turn on the afterburner at takeoff.
You have to see that the article, like any article, is a mishmash of facts, rumors, and inferences by the reporter in question. That is why I was kind of selective with the quote I made. For example the article also states the Chinese were interested in purchasing the Izd. 30 as a result.
"The PLAAF, having run out of options to utilise an indigenous engine, are now exploring possibilities to purchase some of the Russian-made Izdeliye-30 engines. This design is in flight test now with the Sukhoi Su-57 5th-generation fighter programme and a Chinese team has reportedly been promised a demonstration of this new Russian design."
I have read other rumors though which state that the Izd. 30 engine has issues with the welds not lasting long enough at high operating temperatures and that (other) article corroborated this by mentioning the engine manufacturer was searching for welding specialists.
Now, I find this really strange to say the least because the Russian aerospace industry seems to be able to weld rocket engines just fine and those operate at much, much higher temperatures than any jet engine would. But who knows.
This just smacks of self-gratification which is why I didn't quote this bit first.
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