-=Rk=-
RK-12 fighter interceptor
Mach 5
Who needs to be maneuverable or stealthy when they can't even hope their missiles will gain ground on you?
https://kerbalx.com/He_162/Rk12
Mach 4! (Don't go to mach 5 unless you are above 14,500m, have the radiator enabled, and have a kerbal who is less than 100% stupid.
*warranty void if kerbal surpasses mach 5 whilst in the cockpit below 16,000m.
*warranty void if vehicle surpasses mach 5.15
*warranty void if training wheels detonated below mach 1 or before craft leaves runway