Aerodynamic heating at Mach 6.72 (4,534 mph) almost melted the airframe. On Oct. 3 1967 the North American X-15A-2 serial number 56-6671 hypersonic rocket-powered research aircraft achieved a maximum Mach 6.72 piloted by Major Pete Knight. Operated by the United States Air Force and the National Aeronautics and Space Administration as part of the X-plane […] http://ift.tt/2zVn0tH
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