Chengdu J-20 'BLACK EAGLE' - History, Design, Performance & Discussion

It’s not an unpopular opinion.
The current J-20 looks a bit wack mainly because the canopy is quite small.

The J-20A is arguably even better looking than the J-20S (two-seater) though.


(Welcome, prototype 2057 of the J-20A dated December of last year.)

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18 technically. 6 internal PL-15E, 8 external PL-15, 2 internal shoulder bay PL-10 and 2 external PL-10 missiles. PL-15E (the folding wings one, not export one) can give more space for internal storage, so instead of 4 PL-15 you can have 6 PL-15E (this can be seen on the J-35A internal storage). Recent images/videos showed some PL-15 variants being carried, 8 precisely in external pylons. Ofc there is also the PL-10 shoulder bay launcher, but PL-10 pylons were also spotted on the outermost pylon

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So we’re just saying stuff huh

Better TWR, lift coefficient of 2, Li Gang, a chief test pilot has also stated that the J-20’s maneuverability is comparable to the J-10 (most probable B variant).

Most of what I’ve seen compares the F-35A to a clean F-16C/Hornet in BFM. Three pilot anecdotes highlight a general level of performance.

“When I’m down range in Badguyland that’s the configuration I need to have confidence in maneuvering, and that’s where I think the F-35 starts to edge-out an aircraft like the F-16,” Kloos says. The F-35′s acceleration is “very comparable” to a Block 50 F-16. “Again, if you cleaned off an F-16 and wanted to turn and maintain Gs and [turn] rates, then I think a clean F-16 would certainly outperform a loaded F-35,” Kloos says. “But if you compared them at combat loadings, the F-35 I think would probably outperform it.”

“The F-35 actually flies very, very similarly to the Hornet, both classic and Super,” he related. “In fact, it’s probably more like the Super in the way it feels. The alpha (angle of attack performance) and the power is similar to a Super Hornet, although it’s got a little bit more power down low.

“Being this well prepared, I experienced no surprises whatsoever during my first flight. I found it relatively easy to convert from the F-16 to the F-35. Because both are Lockheed Martin products, there are many similarities between the two types. When comparing performance, I would say that the F-35 turns like an F-16 with pylon tanks; but it climbs, descends & accelerates like a clean F-16. The power of the aircraft is really impressive.

Maybe I’ve undersold the F-35A’s performance slightly, but there’s nothing to suggest that it would be outright better than the J-20 in BFM. The J-10B, although slightly gaining weight compared to the J-10A (mitigated somewhat by the DSI intake), also has more thrust (132KN). So if we’re looking at the context of the game, J-20 will be likely a bit superior in regards to flight performance, considering that J-10A loses out to only Gripen, EFT/Rafale, (F-16A under certain circumstances).

what’s thrust to weight of j-20 with it’s ws-15 engines.

IDK. No one knows what WS15 is cause some said originally it was 15 tonnes, but cause WS-10C got 14+ tonnes it was basically pointless to use it so they had to improve it off there. So has to be 16t on bench at least and allows supercruise. I would say given 17-19 t empty and the thrust of ±16 tonnes it would be 1.2-1.3 at normal load.

I don’t believe it’s ever been seen with a pl17, they definitely don’t fit in the internal bay

Not internal bay, but they were allegedly spotted on it externally (idk if its photoshop or not). Also models feature it, but I’m also not sure if its official

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Nothing there that would get them added to the game.

Better T/W at static conditions (allegedly), better alleged lift coefficient, comparing maneuverability to another fighter that we have no concrete data on… let’s just focus on sources usable for the game if we’re going to be making comparisons. Notice how I haven’t made any claims about the performance of the J-20 thus far without some kind of verifiable and legitimate source.

To be honest F35 is a confirmed tw ratio, and if J20 is indeed around 19t it would definitely have better twr since it has at least 24 t of thrust, which would be roughly 1.26 vs 1.24 for F35A. ( both empty)

We don’t know the exact weight of the J-20 though. There are many sources that state an empty weight of 17,000kg but I also kinda doubt that. It’s definitely closer to ~18-19 ton range imo.

There could be a way to kinda calculate it, @Yamahagi did a rough calculation with the J-16 iirc. I’d imagine Gaijin would use some random source they find.

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The F-35 T/W is absolutely not confirmed by any means.
It has a variable bypass turbofan unlike the J-20, which means it can alter the static thrust conditions and provide a better power band for the engine whilst also improving fuel efficiency in that entire range.

I would hazard that the F-35B is certainly worse, however.

Of course this whole discussion is silly about BFM when the J-20 doesn’t utilize a gun, or was that not true? I haven’t seen anything about them being equipped with one.

An internal gun was tested at some point on one of the prototypes, though as of current, no production J-20 has fitted it, mainly to save weight and also a general belief that BFM/WVR combat is becoming increasingly rare so there’s not many scenarios that require it. Up close the J-20 has 2x PL-10s (maybe more with external wing hardpoints, but they’ve only been seen carrying PL-15 on the wings for now.)

Well F35’s TW ratio will not exceed 1.24 at all points, since that is with max thrust, obviously J20 biggest issue is the weight, cause it can be anything from sort of 16-19 tonnes, and I used WS 10B for thrust which will be lower than WS 10C and future Ws15. If we use 19 tonnes and WS10B, then J20’s highest twr will be higher however at lower alt/speed F35 will have the edge. Accounting the optimistic values for J-20 however u could get as much as 1.6 or even 1.8 if we want to go that far to say WS15 does more than 15 tonnes.

Actual maximum thrust is classified, and so is the weight. You have no data to support this so unless you have something to share (permissible for use on the forum), then we can leave it at that. I suppose you could start off with “according to wiki…”

PW’s official chart, although this could just be stating the obvious

You mean this ?

IDK,J-20 should be along the lines of dragon or fagin.

So is that the thrust with the maximum bypass ratio? There are so many more variables as I’ve already stated - it cannot be taken at face value.