Reaching the Edge of Outer Space – the X-15 Rocket Space Plane
On October 3, 1967, the X-15 rocket plane achieved a world record speed of Mach 6.7, which is 7,274 km/h (4,520 mph or over a mile per second) with U.S. Air Force pilot Pete Knight. As by today, this record still holds for the highest speed ever reached by a manned, powered aircraft. Among the notable pilots of the X-15 was also Neil Armstrong,[4] later a NASA astronaut and first man to set…
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