Trident said:
I do not wish to prolong this fun but ultimately fruitless debate about similarity too much, but I'll just explain my reasoning in detail this once.
Hardly - the similarity practically ends in fuselage and canopy configuration, both of which resemble the F-22 just as much as the J-20 (which begs the question of why you consider the latter closer than the former?). And a variation of the layout with a wider engine separation more reminiscent of the Su-57 has been shown.
I appreciate your explanation.
I'm not sure which variation with a wider engine separation you speak of, but I'm only talking about the concept shown in the video and the latest poster, whose underside is a flat block like J-20 and F-22 without separated engines and without a pancake.
Vertical tail configuration is very similar to the Su-57, with a markedly lower aspect ratio than the J-20 fins, it lacks ventral strakes and has caret intakes (in both the latter respects it is more like the F-22 and Su-57 than the J-20 which has DSIs). Also, LERX resemblance to the Su-57 goes far beyond the mere presence of LEVCONs, i.e. the compound LE sweep (mildly swept inboard section, sharp sweep angle outboard) and the intakes which (exactly like the Su-57) are set much further back from the LE than on the otherwise similar F-22.
A fair argument, although I would say the LERX and main wing configuration is not too dissimilar to J-20's main wing and LERX as well, the main difference being the presence of canards of course.
Sure, the fuselage configuration dominates visual perception of its shape (appearance and looks, as you put it), but the Su-57-like features go beyond mere aesthetics. At high AoA, the kinked LERX would probably create vortex patterns which are more like those on the Su-57 than the J-20's pure sweep as well as shielding the intakes (with potentially dramatic impact on their performance), also as on the Su-57. I'll grant you that the fuselage will likely dictate a F-22/J-20-style weapons bay arrangement, but otherwise I'd submit the Airbus design is functionally (if not aesthetically) quite a bit more similar to the Su-57.
In terms of control surfaces/wings I think one could argue both J-20 and Su-57 to be equally "similar" to the airbus concept:
-The Airbus concept's wing/lerx/levcon configuration and what looks like all moving V tails, is of course very similar to Su-57's wing/LEVCON and V tails, however the Airbus concept distinctively lacks the Su-57's horizontal tails. So close, but still distinctively different.
-The Airbus concept's wing/lerx configuration also looks quite similar to J-20's main wing+lerx, and J-20 also has all moving V tails but with different geometry/sweep. J-20 also has canards and ventral fins of course, which the Airbus concept does not, so I think the J-20 is not as similar to the airbus concept in terms of control surfaces as Su-57 is, but still not that far.
In terms of fuselage, which imo would dictate a big part of how much one should judge two aircraft's "similarity" (especially for stealth fighters):
-the airbus concept in the video does show an F-22/J-20 esque fuselage like a single "block," rather than having two separate engine/intake nacelles with a space/recess in between them. In that regard, IMO the the fuselage of the airbus concept is very similar to that of F-22 and J-20
-the airbus concept's air intake lip is not that similar to either J-20 or Su-57's air intake lip imo
The rest of the aircraft's nose, canopy, sensor arrangement, which I consider to be not unimportant visually, also looks very much like that of J-20 (or F-35), with a topside nose EO aperture aft to the radome (similar to J-20 and F-35), as well as a chin mounted faceted EO IRST of some kind (also very similar to J-20, F-35). In this aspect, the Su-57 is quite different.
So overall, I can see why Su-57 is considered quite similar to this aircraft, in terms of control surfaces/main wing, but overall, combining the fuselage, control surfaces/main wing, and nose geometry, I think the closest foreign "cousin" is the J-20.
But this is merely a fun thought exercise of course, and we can feel free to agree to disagree.