65 Years Ago: First Powered Flight of the X-15 Hypersonic Rocket Plane 

The X-15 hypersonic rocket-powered aircraft, built by North American Aviation NAA, greatly expanded our knowledge of flight at speeds exceeding Mach 6 and altitudes above 250,000 feet. A joint project among NASA, the U.S. Air Force, and the U.S. Navy, the X-15s first powered flight took place on Sept. 17, 1959, at the Flight Research 8230;. https://www.nasa.gov/histo...
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