J-20... The New Generation Fighter

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SampanViking

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This is largely repeating myself from previous posts, but this has a bit more flesh on the bones of the thinking.

Ok, so people are getting hung up about what we cannot say about this Plane based simply on a few taxi way photos. Actually, I agree but I also think there is a lot more that can be given a pretty good shot at, by simply looking at the bigger picture.

First off, I would not be disparaging about any major aircraft manufacturer and can only acknowledge their respective mastery of their craft. Each is I am sure competent and produces aircraft capable of performing the tasks required of them.

That being said, they are different companies and will therefore approach problems differently, in accordance with their past experience and their innate strengths and weaknesses. There are; no doubt, deep differences in doctrine between the Governments that these companies serve. In the US we get the impression that the aircraft must have required capability at any cost, while in China, this is more nuanced and cost control is given a higher priority even at the expense of capability.

One thing I have learned from dealing with Chinese companies in general is that they look at problems differently than do most Western companies. I doubt very much if Chinese Aircraft Manufacturers think in terms of “generation” when they come to design capability at the right price, but rather look at a range of technologies and capabilities that they wish to counter, neutralise and/or defeat. Part of this of course is a function of catch up, which means that the Chinese already have a target to aim for, while the US companies seem to be putting together the latest technologies and seeing what they get. The Chinese by contrast will not disregard a technology that is effective and cost efficient simply because it is not of “this generation”.

I would also be wary of looking at the design function purely through the prism of Western eyes. As others have mentioned Stealth is an amalgamation of different technologies and techniques and the Chengdu are likely to have strengths and weaknesses across the spectrum of these. In addition, given the level of innovation shown recently by Chinese companies in many industrial areas, where they now define the cutting edge, you should not discount that Chengdu have their own areas of innovation ahead of the rest. I would also add that the characteristic of completing projects ahead of time and under budget is a general Chinese strength not to be underestimated.

All of this adds up to the Chinese being likely to have produced an aircraft with a very particular objective in mind, rather a general technology demonstrator.

So, what have we got?
We have a large twin engine jet that is appears designed to monopolise on Stealth and range. It looks rather expensive compared to other Chinese planes and so I think it is a fair assumption that it would not be used for roles that would compromise the Stealth Advantage.

But what would that be?

I think the best answer is to look at the current and anticipated PLAAF inventory and see where it is most likely to best fit in.

The next thing to do is to look at the PLAAF planes that are top of the queue for withdrawal and replacement.

These are:
J-7 and J-8 Interceptors
Q5 – Ground Attack
H6 - Bombers

The new Aircraft seems a poor fit for any of these niches – wasted as a fast defender interceptor and losing its stealth advantage carrying externally mounted Ground Attack Munitions and with nothing like the carrying potential of the H6

Is then the new plane intended to replace something in or compliment the current front line tactical line up?

China’s front line is largely made up of highly capable aircraft from the Flanker and J-10 families, most are still new, effective multi strike and multi role aircraft capable of carrying significantly higher weapon payloads than that which can be carried in the internal bay of a Stealth Fighter. While some of the older Flankers may start to be rotated down from front line to replace older defenders, there is still no obvious fit for the J-20 to replace an existing niche currently occupied by these planes.

So, it looks like a new niche, but what is it?

As previously stated, the current front line of J-10’s and Flankers are very capable aircraft capable of carrying out the vast majority of China’s air defence needs, with one notable exception - having to penetrate enemy territory defended by Stealth Fighters.

To fill this gap, China would need a long distance, long endurance Air Superiority Fighter which capitalised on Stealth to ride shotgun for the Strike Aircraft, hunt the hunters and carry primarily Air to Air Munitions.
I believe that the J-20 is indeed that plane. I would further deduce that given the likely cost of the aircraft and its very particular mission, that numbers intended for service will be in the very low hundreds if indeed barely breaking into triple figures.

I also suspect that “Stealth” is not going to be a fundamental requirement of all new Chinese Aircraft, not at least until the cost of the technology is considerably reduced.
 

KYli

Brigadier
Pinkov is in Chengdu.

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加拿大漢和防務評論月刊將在數日之內公開J20照片

漢和防務評論最新一月號將在本月18日公開首批J20照片,這是西方媒體首次獲得的J20圖片。並且進行詳細分析。

漢和編輯部敬啟
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推薦:漢和成都快訊:J20進行第二次滑跑實驗

漢和防務評論成都特快專電:漢和防務評論記者確認公元2011年1月5日下午北京時間2:00開始,J20隱形戰鬥機在成都黃天巴(音讀)機場進行了第二次滑跑實驗。國產發動機的轟鳴聲震耳欲聾!這是首個西方媒體在第一線確認J20的存在。

漢和發言人平可夫表示:滑跑實驗是成功的。試飛已經進入倒數計時。

Kanwa Defense Review: Kanwa Defense Review journalists confirmed that at January 5, 2011 2:00 pm Beijing time, J20 stealth fighter in Chengdu Huang ba Airport conducts high speed taxi experiment for the second time. Domestic engine is loud! This is the first Western media in the first line to confirm the presence of J20.

Kanwa spokesman Andrei Chang said: roll experiment is successful. Test has entered the countdown.
 

MwRYum

Major
Pinkov is in Chengdu.

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加拿大漢和防務評論月刊將在數日之內公開J20照片

漢和防務評論最新一月號將在本月18日公開首批J20照片,這是西方媒體首次獲得的J20圖片。並且進行詳細分析。

漢和編輯部敬啟

Yeah, like Kanwa get pics that ain't from the China's BBS sites...
 

KYli

Brigadier
Pinkov has been copying and pasting stuffs from the Chinese BBS sites and CDF ever since i can remember. No need to point out what is so obvious.
 

Martian

Senior Member
K-8 chase plane

txq9e.jpg


K-8 will be the chase plane for J-20's first flight. Keep track of January 6th; 2:30PM China time. The rumor of a flight test could be true. Also, CCTV just had a talk show on 4G/(5G) jet on 5th January night, possibly as a prelude.

Note: Thank you to Icloo for the post.
 

cloyce

Junior Member
Re: K-8 chase plane

txq9e.jpg


K-8 will be the chase plane for J-20's first flight. Keep track of January 6th; 2:30PM China time. The rumor of a flight test could be true. Also, CCTV just had a talk show on 4G/(5G) jet on 5th January night, possibly as a prelude.

Note: Thank you to Icloo for the post.

Could you link us the CCTV talk show, please?
 

danielchin

Junior Member
Re: K-8 chase plane

Could you link us the CCTV talk show, please?

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I found this one, nothing you don't know:
"5th generation fighter is a must-have, not a luxury, for China"
"5th generation got plenty funding from central bank and won't be interrupted, so can't use J-8 as an example to predict the development cycle time"
......
 

Roger604

Senior Member
Can someone well versed in aerodynamics explain to me the canards that are a good part in the same level as the wings, or not very much higher than the wings.
The following is quoted from an expert from another forum:

1) This thing may have big (-10%Mac) negative static margin for transonic speeds. this also should help out with L/D at supercruise speeds.

2) for close coupled big canards/LEX/DeltaWing combo, 1+1+1 > 3. thus on the planeform side you may will see over all a smaller lifting surface (higher onpaper wing loading) than the other two.

3), comment 1)+2) should tells you bit about what the idea is for this design. longitudinal wise: try to get good nose pointing ability, good energy turns, and good cruise drag, at same time and affordable price.

4) On T-50: T-50's wing-body design relies on channel flow between two big engine booms. not entirely with out problems, imho. draggy. the name of the game is always L/D and LEVCON is not necessarily better get your a better L/D. and it does have its drawbacks. and LEVCON certainly can not beat canards at high AOA nose down pitching moment generation.

5) DSI may not be that bad with supersonic pressure recovery, all depends on how you design it and where your critical speeds are.

6) This thing may well turn out to have distributed hydraulic/ EHAS.

7) ah those dreaded ventral fins. my guess is lateral stability at high aoa ( and high mach) may be border line with the two smallish VT when they did their tunnel and cfd studies. and the canards are naturally handicapped at providing enough rolling moment (main wing aileron is long gone) at extreme aoas. (see F-22's famous paddle walk), thus they are out of options. now unless flight test turns out that that's not critical or they are really going to get some good TVCs, fins are staying.

which are not necessarily excruciatingly good RCS reflectors.... certainly the much smaller all moving smaller VT helped balanced out the total side RCS budget.


over-all very nice job Mr. Yang Wei and Mr. Song. and all the hardworking folks at 611 and 132, hats off to you guys, merry christmas happy new year.

Now let's see WS-15 is really what it touts itself to be.

I don't see such long and heavy aircraft to be in the same class as F-22 and T-50 in terms of maneuverability. Also it will need monster engines to SC, but even then DSI intakes will put its limits.

I think you may be surprised. you still hasn't see its actual weight class. human eyes are deceptive.
 
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