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That Time An X-15 Rocket Plane Entered Hypersonic Spin At Mach 5 And Broke Apart Killing USAF Test Pilot.
U.S. Air Force test pilot Maj. Michael J. Adams was killed during X-15 Flight 191 on Nov. 15, 1967. The North American X-15 was a hypersonic rocket-powered aircraft 50 ft long with a wingspan of […]