Talk:AIF/@comment-25453078-20150209161203/@comment-27797576-20150209165656

and the XF/LB-1000 used a Sabre rocket engine to reach mach 10(it's a jet engine that can turn into a rocket engine, look it up), and the new model 1500's(I say that because now I have to make a new one for air combat) use high thrust engines(impulse drives, fusion powered rocket engines, something like that). normal jet engines simply can't have that performance without losing effectiveness for power output.

and yes that is true, but that's called super cruise engines, they are not normal, and no fighter jet IRL(or even RP) has ever gone mach 3 without a ram jet or scram jet, or something that has effectively no moving parts at high speed(fans, gears, etc).