Critical Mach versus Altitude...
I'm trying to determine what happens to Critical Mach in relation to altitude. I cannot find any sources and I've tried reading thru High Speed Aerodymics in Aerodynamics for Naval Aviators but haven't had much luck. I know in some aircraft VMO/MMO goes up slightly with altitude and then comes down. Is it dependant on the design of the aircraft or can it be plotted as it relates to mach speed?