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For a Mig-31, I think to break the sound barrier she will need to go for after burners and after burners are not known to be used for prolonged duration it is also not fuel efficient, after burners are for short shots usually for added power and thrust at the cost of fuel inefficiency.It seems the F-22's speed is either governed or simply hidden. AFAIK, greater than Mach 2 speed is actually a self imposed restriction. F-15s had major restrictions as well.
It is more draggy than F-15 and will require greater power to move as fast. But I think less draggy if weapons stores are added on the teen.
There is no doubt the F-22 can manage Mach 1.6 for 40 minutes using supercruise, according to requirements. I think they mentioned something about a 200-400Km supercruise range with a combination of subsonic speeds for 1000Km.
Comparatively I think Mig-31 can do Mach 2.35 for a 700Km range.
The reason I am asking this question is that afaik non variable geometry inlet arrangement jet fighter generally have a maximum speed of M 1.8 while fighters crossing that mark implement modified inlet arrangement to tackle shock waves required to cross 1.8-2.0 mark. All known M1.8+ jet fighters have variable geometry inlets as like F-15, Mig-31/25,Su-27/30,Mig-29 and Mirage 2000( with its movable cone) while fixed geometry inlet fighters like Rafale, Su-34 and other comparable even including the DSI designed F-35 fighter jets are not known to exceed M 1.8-2.0. Note the difference between Mirage 2000 and Rafale where the later one is later produced and can do super cruise but have a lower top speed, and also su-27/30 and su-34 while both share an almost similar design but the later do not include a variable geometry inlet arrangement and top speed drops to M1.8 mark. I also wonder if the J-20 could cross the M 1.8 mark with her fixed geometry DSI inlet design.
F-22 is know to have a fixed geometry inlet design.
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