| http://www.w3.org/ns/prov#value | - He reached a top altitude of 207,500 ft (63.2 km) in the X-15-3, and a top speed of Mach 5.74 (4,000 mph or 6,615 km/h) in the X-15-1, and he left the Dryden Flight Research Center with a total of 2,450 flying hours in more than 50 types of aircraft.
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