I wonder how hard it really is? Lockheed X-7A3, a ramjet demonstrator flew at mach 4.5 in the fifties already, and ASALM flew at mach 5.5 around 1980 before can

I wonder how hard it really is? Lockheed X-7A3, a ramjet demonstrator flew at mach 4.5 in the fifties already, and ASALM flew at mach 5.5 around 1980 before cancellation in favor of subsonic cruise missiles. http://www.designation-systems.net/dusrm/m-60.html http://www.designation-systems.net/dusrm/m-60.html http://www.designation-systems.net/dusrm/app4/asalm.html http://www.designation-systems.net/dusrm/app4/asalm.html