- Jan 12, 2020
good jokeJ-20 World Ranking
J-20 (Mach 2.5+)> F-22 ( Mach 2.25)> Su-57 (Mach 2)> F-35 (Mach 1.6)
However you should read more, the DSI intake is fixed thus the multi shocks needed will be ingested by the intake damaging the engine blades, in fact losing more than 10% of pressure recovery means more than 15% of engine uninstalled thrust will be lost.
Mach 2.5 while potentially is very unlikely, even with ws-15 will reduce so much thrust that the aircraft will suffer in acceleration, in few words at high altitude with fixed intake of DSI type the J-20 will deplete its fuel to say it will reduce its fuel reserves to a few minutes flight, so all what you wrote do not amount to real facts the J-20 is a Mach 1.6 or Mach 1.7 aircraft where the fixed intake can keep 94% pressure recovery, beyond that at Mach 2.5 it is not realistic it will deplete its fuel reserves in few minutes and will damage the engines.
So honestly read more to have speed of Mach 2.5 it needs variable geometry intakes with the ability to position the shocks outside intake lips and bleed the excess mass flow out of the engine, otherwise most of what you say is pure fantasy, not with even mixed compression with external and internal compression can achieve it without bleeding system and Variable geometry intakes