X-15 - "The Record Setter"

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The X-15 was designed to explore hypersonic speeds in excess of Mach 6 and altitudes over 300,000 feet. The aircraft was powered by a rocket engine dubbed "the million horsepower engine". There were three X-15 aircraft built and they were flown from 1959 though 1968. On August 22, 1963, flying the number 3 aircraft, pilot Joe Walker set a new altitude record of 354,000 feet. Such altitudes are considered above Earth's atmosphere. For this reason many of the X-15 pilots were awarded astronaut pins. Sadly, Joe Walker lost his life when the F-104 Starfighter he was flying collided with another high performance aircraft, the XB-70 Valkyrie. Both aircraft were lost.