Chengdu next gen combat aircraft (?J-36) thread

AndrewJ

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Key design details from Wang Haifeng's paper:
  1. By simultaneously adopting adaptive variable cycle engines and variable geometry air intake designs, the aircraft can achieve much fewer spill drag under different operating conditions at various flight stages, including takeoff, subsonic cruise, transonic, and supersonic cruise. This allows much better high-speed performance, reduces fuel consumption, and extends range.
  2. Significant rear radar and infrared stealth capabilities can be achieved through integrated intake/engine fan, integrated engine air bleed/cooling, TVC nozzles, integrated afterburner combustion chambers, and S-shaped nozzles. (5th gen has poor rear infrared stealth performance.)
  3. Active infrared suppression measures for end-game countermeasures against infrared-guided missiles are implemented through the injection of cold media on the engine's tailpipe hot surfaces and the use of aerosol jet injection.
  4. Engine design is coordinated with the overall fighter aircraft design during the entire design process, optimizing both thrust and infrared stealth characteristics, with repeated checks at each design phase to ensure infrared stealth targets are met.
  5. A flexible thermal management system to balance thermal peaks and valleys. Duct air has fewer design limitations for heat dissipation systems, allowing for lighter and more compact duct radiators.

His definition about high-performance fighter jets:
  1. More comprehensive flight performance, capable of balancing deep penetration (long-time supersonic cruise) as well as maneuverability at typical combat engagement points.
  2. Enhanced stealth performance, broadening frequency and spatial ranges, including radar and infrared, enabling penetration in high-threat areas.
  3. Larger weapon payload capacity, supporting sustained engagement and fighting against numerically superior enemy forces with fewer resources.
  4. Strong situational awareness and electronic warfare capabilities, allowing for priority evasion of enemy detection and gaining the first-look, first-shot advantage when evasion is not possible.
More pics...

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Jason_

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I have been rereading articles surrounding the 2020 USAF NGAD prototype/demonstrator reveal. It turns out the same USAF official who claimed that an NGAD prototype/demonstrator flew in 2020 was the guy who championed the now canceled “digital century series.”

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In fact, with the information we now have about the NGAD program delays and rework, it seem very likely that the 2020 prototype was a one-off commission to quickly build something that looks good and flys to validate the “digital design process” concept that the USAF want to sell to Congress.

Some examples of the USAF digital design initative includes

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In fact, I suspect the technology that the 2020 demonstrator was demonstrating was “digital engineering/rapid prototyping” instead of any groundbreaking aerodynamics/signature reduction/sensors/power management etc. that we associate with 6th gen. It would explain why LM and Boeing were still in the design phase and why the project could be fundamentally reworked.

If this is the case, it would mean China is even more ahead with the J-36 and SHENGAD.
 

Blitzo

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I have been rereading articles surrounding the 2020 USAF NGAD prototype/demonstrator reveal. It turns out the same USAF official who claimed that an NGAD prototype/demonstrator flew in 2020 was the guy who championed the now canceled “digital century series.”

Please, Log in or Register to view URLs content!

In fact, with the information we now have about the NGAD program delays and rework, it seem very likely that the 2020 prototype was a one-off commission to quickly build something that looks good and flys to validate the “digital design process” concept that the USAF want to sell to Congress.

Some examples of the USAF digital design initative includes

Please, Log in or Register to view URLs content!

Please, Log in or Register to view URLs content!

In fact, I suspect the technology that the 2020 demonstrator was demonstrating was “digital engineering/rapid prototyping” instead of any groundbreaking aerodynamics/signature reduction/sensors/power management etc. that we associate with 6th gen. It would explain why LM and Boeing were still in the design phase and why the project could be fundamentally reworked.

If this is the case, it would mean China is even more ahead with the J-36 and SHENGAD.

I have considered that for a few years as well, especially as some people of note in the industry or the service have alluded that Roper's revelation was not as impressive as he made it out to be.

At any rate, I think we can't rule out the possibility that the NGAD demonstrator flown might have also still incorporated new aerodynamic or signature reduction technologies, and it is also possible it could have been a full scale airframe too.

But I think at this stage the chances of it being a "representative prototype" of an "intended for production design" seems somewhat on the low side, compared to J-36 (and possibly SAC's jet as well).
In terms of solid, concrete evidence, technically both J-36, SAC's jet, and the NGAD demonstrators flown are all "unknown" in terms of how "representative" they are of being for an intended design... but the practical likelihoods are not in the NGAD's favour at this stage.
 

AndrewJ

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Compare to F-35 or J-20, the newer gen jet designers will have a better idea of the future changes (larger engines, bigger radar, laser etc) thus they can plan ahead. Let the designers do their job
Well that's the point. 5th gen fighters have no potential to arm future direct energy weapons. Airframes are not large enough, also energy generation and management systems are not good enough. Then comes 6th gen.
 

sevrent

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AVCE is coming out in 2~3 years.
J36 may not change wing shape(?), but inlet shape. According to the paper from chief designer. I listed some points above.
Do we know what kind of VCE they are working on? the VCE of the YF-120 kind is very very different to the much more complex 3 stream design for XA100 and NGAP. NGAP will be even more advanced than that bringing variable tech to the turbine core. I hope its the latter, if so that will be the most monumental tech leap China will ever make wow..
 

bsdnf

Junior Member
Registered Member
I have been rereading articles surrounding the 2020 USAF NGAD prototype/demonstrator reveal. It turns out the same USAF official who claimed that an NGAD prototype/demonstrator flew in 2020 was the guy who championed the now canceled “digital century series.”

Please, Log in or Register to view URLs content!

In fact, with the information we now have about the NGAD program delays and rework, it seem very likely that the 2020 prototype was a one-off commission to quickly build something that looks good and flys to validate the “digital design process” concept that the USAF want to sell to Congress.

Some examples of the USAF digital design initative includes

Please, Log in or Register to view URLs content!

Please, Log in or Register to view URLs content!

In fact, I suspect the technology that the 2020 demonstrator was demonstrating was “digital engineering/rapid prototyping” instead of any groundbreaking aerodynamics/signature reduction/sensors/power management etc. that we associate with 6th gen. It would explain why LM and Boeing were still in the design phase and why the project could be fundamentally reworked.

If this is the case, it would mean China is even more ahead with the J-36 and SHENGAD.
At that time, many observers believed that this was a "digital test flight". It was hard to imagine that now the US Air Force changed the original NGAD heavy aircraft to NGAD light aircraft + more CCA design, saying that "each proposal is impressive but not good enough", after the so-called "multiple demonstrator test flight". Isn't this equivalent to wasting most of the demonstrator? In any case, this reveals that the project is in trouble, military-industrial complex cannot produce the performance that the US Air Force needs, or even the US Air Force does not know what it needs
 
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AndrewJ

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Do we know what kind of VCE they are working on? the VCE of the YF-120 kind is very very different to the much more complex 3 stream design for XA100 and NGAP. NGAP will be even more advanced than that bringing variable tech to the turbine core. I hope its the latter, if so that will be the most monumental tech leap China will ever make wow..
whatis NGAP:oops:
 

MrGoose

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