J-20 5th Generation Fighter VII

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siegecrossbow

siegecrossbow

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by78 said:
An academic paper that appears to show J-20's fatigue testing setup. I don't have access to the full paper.

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Ventral strakes are not factored in? They are important for maintaining stability in high AOA regime since J-20 has small all moving vertical slabs. I’d assume that they’d be major load bearing surfaces.
 
BoraTas

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Atomicfrog said:
Or like the F-35 that is not ready even if it's in full production, they are retiring older batch already and it didn't achive the capabilities it supposed to have yet.

If NGAD is signed in 2024, and the program goes well like the F-35, we can see them in small batch production of empty shell without capabilities from 2030.

We can see them build in increment of capabilities for about 10 years, before being somewhat working correctly in 2040 but with still half of promised subsystems not working properly but they will decide to go without most of them in 2045.

2044 is the planified end of production of f-35, it would fit well.
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NGAD will almost certainly go better than the F-35. The F-35 became the quagmire it was because of the F-35B and 8 partner countries. They also added many technologies that were certainly not mature yet. Sensor fusion, auto data analysis and networking, lower maintenance stealth were not mature back then. NGAD is a less ambitious project with a clearly defined goal.
 
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Atomicfrog

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BoraTas said:
NGAD will almost certainly go better than the F-35. The F-35 became the quagmire it was because of the F-35B and 8 partner countries. They also added many technologies that were certainly not mature yet. Sensor fusion, auto data analysis and networking, lower maintenance stealth were not mature back then. NGAD is a less ambitious project with a clearly defined goal.
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Wanting to go beyond F-35 capabilities when they are not even able to achieve them already... it's quite hard to be optimistic.

J-20 evolution with new engines is clearly showing steps going forward. We cannot say the same with F-35 and F-22 have one feet in retirement already.

Pretty sure that J-20 replacement is already in the pipeline and will be able to met NGAD in time.
 
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Michaelsinodef

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Atomicfrog said:
Wanting to go beyond F-35 capabilities when they are not even able to achieve them already... it's quite hard to be optimistic.

J-20 evolution with new engines is clearly showing steps going forward. We cannot say the same with F-35 and F-22 have one feet in retirement already.

Pretty sure that J-20 replacement is already in the pipeline and will be able to met NGAD in time.
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We already got told that the chinese 6th gen fighter will come out ~2030, what state? I would bet atmost be limited production by then, but still, I don't think the NGAD would be much better.
 
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hundredyears

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by78 said:
An academic paper that appears to show J-20's fatigue testing setup. I don't have access to the full paper.

52910902471_0d13af3a50_k.jpg
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is a copy of the paper.

A few other takeaways besides the curious seemingly-J-20 related diagrams:
- The authors assesses current capabilities of China's full-aircraft fatigue testing programs to have attained generally comparable levels vis-à-vis western counterparts after decades of development, although notable shortfalls remain in various domains, including modular tests, overall planning, tech implementations, damage treatments, etc. (the above is based on a notional translation of the excerpt: 我国在强度试验领域经过了近半个世纪的发展，建立了较完整的试验体系......与欧美等国的全机疲劳试验技术相比，试验整体技术已经相当，但在个别方面还存在一定差距，主要体现在试验积木式验证、总体规划、部分实施技术以及试验损伤处置等方面。)
- After incorporation of latest aircraft fatigue testing technologies, testing speeds for a new generation fighter aircraft (presumably J-20) improved considerably over a legacy 3rd generation fighter aircraft (presumably some variant of J-10).
1684672949863.png
The specific measure provided for testing speed nearly doubled (# of bands/day, 9742 vs 5067, +92%) for the newer fighter despite greater testing complexities with being a larger platform.

It might be interesting to compare this indicator with what one can find for USAF/USN aircrafts, with the usual apple/orange caveats in mind.
 
by78

by78

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hundredyears said:
Please, Log in or Register to view URLs content!
is a copy of the paper.

A few other takeaways besides the curious seemingly-J-20 related diagrams:
- The authors assesses current capabilities of China's full-aircraft fatigue testing programs to have attained generally comparable levels vis-à-vis western counterparts after decades of development, although notable shortfalls remain in various domains, including modular tests, overall planning, tech implementations, damage treatments, etc. (the above is based on a notional translation of the excerpt: 我国在强度试验领域经过了近半个世纪的发展，建立了较完整的试验体系......与欧美等国的全机疲劳试验技术相比，试验整体技术已经相当，但在个别方面还存在一定差距，主要体现在试验积木式验证、总体规划、部分实施技术以及试验损伤处置等方面。)
- After incorporation of latest aircraft fatigue testing technologies, testing speeds for a new generation fighter aircraft (presumably J-20) improved considerably over a legacy 3rd generation fighter aircraft (presumably some variant of J-10).
View attachment 113069
The specific measure provided for testing speed nearly doubled (# of bands/day, 9742 vs 5067, +92%) for the newer fighter despite greater testing complexities with being a larger platform.

It might be interesting to compare this indicator with what one can find for USAF/USN aircrafts, with the usual apple/orange caveats in mind.
Click to expand...

Thank you!
 
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test1979

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Papers in Acta Aeronautica Sinica
It is mentioned that the j-20 has both air cooling and liquid cooling systems in terms of refrigeration.
usually
Air forced cooling is adopted for key core electronic equipment,
For high-power equipment such as radars, electronic warfare systems, etc., a liquid cooling system that distributes heat into the onboard fuel is used.
If some systems fail, they can be converted to each other
j-20u2.pngj-20u3.png
 
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