Chengdu J-20 news and analysis Part III

[SUPER=BUG]

 

[snne]

View attachment 742214

This is an ancient photo, pal.

 

[MrPhantomMan]

Are there any authoritative documents on the aerodynamics of the J20? Like best guesses on how well she might perform, etc.

 

[stealthflanker]

Are there any authoritative documents on the aerodynamics of the J20? Like best guesses on how well she might perform, etc.

No, and it is unlikely to be released in public in near term by authoritative figures. You have to make your own estimates and defend it when bring it in public forums.

View attachment 742214

Now replace this with PL-17 or other pods. It's gonna be awesome.

 

[NovaGA]

Are there any amateur calculations of J-20 area-rule based on constructed 3d model?

 

[stealthflanker]

Are there any amateur calculations of J-20 area-rule based on constructed 3d model?

No. I do have however J-20 3D model. Tho i'm not sure how to "slice" the model and do the measurement.

 

[NovaGA]

I guess “slicing” is the hardest part, as I cant imagine any simple way to do it «non-manually», but if you succeed, a comparison with other fifth generation fighters would be appreciated, if you happen to have models for them too.
You might ask Paralay for help, he did arearule calculation for his model of MiG-70.1.

 

[sferrin]

I guess “slicing” is the hardest part, as I cant imagine any simple way to do it «non-manually», but if you succeed, a comparison with other fifth generation fighters would be appreciated, if you happen to have models for them too.
You might ask Paralay for help, he did arearule calculation for his model of MiG-70.1.

If the model was "air tight" you could slice the solid fairly easily in Solidworks. Then you just get the area of the sections and adjust for scale.

 

[aonestudio]

https://twitter.com/x/status/1845966988222648718

View: https://x.com/zhao_dashuai/status/1845966988222648718?t=swRlo057ejNGoQLRklolPA&s=19

 

[siegecrossbow]

Four J-20 from Anshan making their Zhuhai debut.

 

[siegecrossbow]

PL-15 launch from main bay.

 

[Deino]

How real or credible is this?And do they really think the PLAAF - with the WS-10C already long mature & the WS-15 around the corner - will consider it as an engine for the J-20?By the way, what is the 177S? ... the 117S = AL-41F-1S (izd. 117S) is used by the T-50/Su-57!

@

@flateric

And this is clearly a hint, the RuAF will finally purchase a squadron of J-20 & J-35A each!!!

 

[Scorpion82]

How real or credible is this?And do they really think the PLAAF - with the WS-10C already long mature & the WS-15 around the corner - will consider it as an engine for the J-20?By the way, what is the 177S? ... the 117S = AL-41F-1S (izd. 117S) is used by the T-50/Su-57!

@
View attachment 747424
@flateric

And this is clearly a hint, the RuAF will finally purchase a squadron of J-20 & J-35A each!!!

View attachment 747423

The AL-41F1S (117S) is the version used on the Su-35S. The version currently powering the Su-57 is the AL-41F1 (117) without S. 177S could well be a typo, or it's the new AL-41F1 based version with AL-51F tech for the Russian Flanker familiy.

 

[Forest Green]

PL-15 launch from main bay.

View attachment 747401

New Version Of Chinese PL-15 Air-To-Air Missile Tailored For Stealth Fighters Revealed

A folding-fin version of the active-radar-guided missile will equip the J-35 and will likely expand the J-20's internal carriage from four to six. A folding-fin version of the active-radar-guided missile may be key to providing medium-range internal weapons for the J-35 stealth fighter.

www.twz.com

 

[lancer21]

On a more lighthearted note, have you noticed how, just like the Su-57 has it's own characteristic and by now quite famous howl, so does the J-20 has it's own unique howl too? Kinda reminds me of a tie fighter. Pretty awesome from a fanboy perspective.

View: https://www.youtube.com/watch?v=2clH75XcviY

 

[Avimimus]

Wasn't one of the samples for the Tie Fighter actually from a jet fighter? A lightning or a hunter or something along those lines?

 

[Life of Tyo]

J-20A fire PL-10A missile

 

[FighterJock]

Now that is a first Life of Tyo, first time that I have ever seen a J-20 fire of a PL-10A, no doubt that actual video footage of the shot will be made available soonish?

 

[Elysium]

View: https://www.youtube.com/watch?v=n_qHL_HHuBY

Just watched this demo from Zhuhai, and is it just an illusion, or do the J-20s wobble a bit in the roll axis after finishing a manuever? It looks like the controls are a bit under-damped.

 

[FighterJock]

Or has the display been dampened a bit to hide the true manouverability of the J-20? Just a thought.

 

[AGS-1787]

Is the video auto stabilization?

 

[Elysium]

Nah, I'm pretty sure what I'm seeing is real - there's some subtle jerky movements when the pilot stars or exists aggressive manuevers - it's possible that the issue is not with the aircraft but the pilot to some degree. If you start rolling a 20 ton airplane and suddenly ask it to stop, the control system has a hell of a job to figure out. Coming from the Su-57 video it was quite noticeable, but so was the fact that the Su-57 always smoothly transitioned between manuevers. The lack of TVC might also have something to do with it.

 

[TMA1]

Yeah from 40 seconds to 46 seconds. I saw this too. I am out of my depth with a lot of the science and engineering of aircraft weapon systems so I chalked it up to the inherent instability of modern fighters like the J-20 and if there was a problem they can pretty quickly modify the flight logic and fix the issue.

 

[TomcatViP]

It´s still much better than with the J-35.

 

[Blitzo]

Nah, I'm pretty sure what I'm seeing is real - there's some subtle jerky movements when the pilot stars or exists aggressive manuevers - it's possible that the issue is not with the aircraft but the pilot to some degree. If you start rolling a 20 ton airplane and suddenly ask it to stop, the control system has a hell of a job to figure out. Coming from the Su-57 video it was quite noticeable, but so was the fact that the Su-57 always smoothly transitioned between manuevers. The lack of TVC might also have something to do with it.

Yeah from 40 seconds to 46 seconds. I saw this too. I am out of my depth with a lot of the science and engineering of aircraft weapon systems so I chalked it up to the inherent instability of modern fighters like the J-20 and if there was a problem they can pretty quickly modify the flight logic and fix the issue.

It´s still much better than with the J-35.

That specific video is from a person who stabilizes their videos -- on this occasion they have videos for...
-Su-57/T-50: https://www.bilibili.com/video/BV1HHmkY1ENB/?share_source=copy_web
-J-20: https://www.bilibili.com/video/BV1VKmxYQEmb/?share_source=copy_web
-J-35A: https://www.bilibili.com/video/BV14YzAYxEi4/?share_source=copy_web
-and even Y-20: https://www.bilibili.com/video/BV1PPmmYYEPU/?share_source=copy_web

(open the links on a desktop if you haven't navigated bilibili before, it will be more intuitive for you that way)

For all those videos, you see "shakes" on all of those aircraft, including the Y-20 lol, and in the description of their videos they mention the use of stabilization, and one can actually tell quite easily from videographers who have used stabilizations on their videos versus those who have not, it's actually quite jarring.

E.g.: this is a video from Zhuhai this year of J-20s without stabilization, thus not having the weird shakes (with another sign of it lacking stabilization being that the aircraft is not always perfectly "in frame")

View: https://www.youtube.com/watch?v=VjaDRQiSZ-w




I'm surprised anyone would actually see those shakes and think they're actual movements of the aircraft itself.

 

[TomcatViP]

When they come with governs deflections in accordance with them, they are certainly not part of your camera stabilization system... Well unless you bought your own at an Hydra auction.
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