that is only because the early on FC-31 was advertised to international customers, SAC must show how advanced they are. J-20 is not for sale, PLAF won't allow anything of it being revealed except the outer look.
J-20 5th Generation Fighter VII
- Thread starter siegecrossbow
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Nah, I think very much that the J20 can surpass mach 2.0 for topspeed, but it's not 2.8 (although it could be anywhere from 2.1 to 2.7).
And like others have said, the SU-57 most likely arent better than the J20 in topspeed.
It was a fc-31 prototype from about ten years ago that had some 3D printed bulkheads. There was even a photograph of it with engineers posing with one of the bulkhead pieces. Maybe someone still has that photo saved somewhere to share.
J-20 may or may not have made use of 3D printing structural components. They don't say anything about the frame of in service frontline fighters and certainly won't be revealing much.
Fc-31 prototype was the first aircraft to make use of 3D printed structural sections back then literature and suggestions implied weight saving by going with additive manufacturing although this is unknown whether true and if so, how true on weight savings vs structural performance compromises if any.
J-20 may or may not have made use of 3D printing structural components. They don't say anything about the frame of in service frontline fighters and certainly won't be revealing much.
Fc-31 prototype was the first aircraft to make use of 3D printed structural sections back then literature and suggestions implied weight saving by going with additive manufacturing although this is unknown whether true and if so, how true on weight savings vs structural performance compromises if any.
How will top speed be mach 2.8 with the current engines.
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You are mistaken in the relationship between speed and engine thrust.
Thrust is to accelerate and then counter the drag (air friction). Aircraft with a weak engine can reach very high speed so long as it can counter the drag at that speed. The drag is a product of the shape. A sleek body generates less drag therefor can reach high speed. The only difference between stronger and weaker engine on an specific air-frame is the former can reach that given speed faster.
Example is J-8 whose top speed is mach 2.3 even though its thrust to weight ratio is far lower than many later aircraft including J-20. J-20 has a body shape that is better suited for high speed than Su-57 and F-22. It is longer than its width in proportion similar to J-8. Even if its current engines are weaker, it is very likely to reach mach 2.3 or higher.
Engine thrust is NOT the only factor determine the top speed. Air-frame shape is more important factor. This subject has been discussed to death in this forum.
J-8's top speed is mach 2.3 much much faster than F35. J-8's engine is much much weaker than J-20 or F35.
The reason is air-frame design, F35 is not designed for high speed, J-20 is. Put it simply, no matter how powerful your engine is you can not make a house fly supersonic.
Y-20 was the first cargo aircraft to use 3D printing technology to speed up its development and to lower its manufacturing cost. MBD is also used, and it's the third aircraft to utilize MBD technology in the world, after A380 (2000) and Boeing 787(2005). In addition to 3D printing, the Y-20 is also the first aircraft in China adopting associative design technology (ADT) in its development.
after all these developments, don't you think, the most prestigious aviation project in modern history of PRC, they didn't implement these latest manufacturing methods on J-20. its obvious.
all units of J-20 from 2019 onward have made with these latest technologies.
Might also be why we have seen bigger production of the J20 from around the 2019ish.
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