>>12149905The 6.72 Mach record is repeated in a few sources, but 6.70 is repeated by slightly better references, and is the more conservative of the two and therefore the better number to throw out. A small difference but still.
t. have a hyper-autistic knowledge of the X-15, dad is a modelmaker and gave me an old X-15-2 kit he had laying around for years a christmas past
