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X-15

1959 experimental aircraft model by North American Aviation and NASA

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About X-15

The North American X-15 is a hypersonic rocket-powered aircraft built by North American Aviation, formerly operated by the United States Air Force and the National Aeronautics and Space Administration (NASA) as part of the X-plane series of experimental aircraft. The X-15 set speed and altitude records in the 1960s, crossing the edge of outer space and returning with valuable data used in aircraft and spacecraft design. The X-15's highest speed, 4,520 miles per hour, was achieved on 3 October 1967, when William J. Knight flew at Mach 6.7 at an altitude of 102,100 feet (31,120 m), or 19.34 miles. This set the official world record for the highest speed ever recorded by a crewed, powered aircraft and remains unbroken.

Facts from Wikidata (CC0). Image by NASA via Wikimedia Commons (Public domain).

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