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Release of the X-15 from NB-52A took place at an altitude of about 8.5 miles (13.7 km) (45,000 feet) and a speed of about 500 miles per hour (805 km/h). [8] The X-15 fuselage was long and cylindrical, with rear fairings that flattened its appearance, and thick, dorsal
The external tanks were jettisoned 67.4 seconds after launch at a speed of Mach 2.0 and 70,000 feet. The total engine burn time during the flight was 141.4 seconds. After Flight 188, 11 more X-15 flights were made before the program was retired. The X-15 program data was used in the planning of future aircraft and spacecraft designs.
Twelve pilots flew the X-15 over the course of its career. Scott Crossfield and William Dana flew the X-15 on its first and last free flights, respectively. Joseph Walker set the program's top two altitude records on its 90th and 91st free flights (347,800 and 354,200 feet, respectively), becoming the only pilot to fly past the Kármán line, the 100 kilometer, FAI-recognized boundary of outer ...
On October 3, 1967, Knight piloted X-15 Flight 188, the program's fastest flight. Flying at a maximum Mach of 6.7 and a maximum speed of 4,520 mph (7,274 km/h), he set a speed record for flight in a winged, powered aircraft. [1] The flight was made in the X-15A-2, the second of three planes in the X-15 fleet.
The X-15, at Mach 6.72, is one of the fastest manned aircraft. Cooled nickel-titanium skin; highly integrated (due to domination of interference effects: non-linear behaviour means that superposition of results for separate components is invalid), small wings, such as those on the Mach 5 X-51A Waverider. High-hypersonic 10.0–25.0 6,615–16,537
On this flight, Joe Walker became the first person to enter space twice. He had a maximum speed of 3,794 mph (6,106 km/h) and a maximum altitude of 354,200 feet. Second and final X-15 flight over 67 miles. [1] Unofficial altitude record set for class. Highest altitude achieved by X-15. [1] Last flight for Walker in X-15 program.
In February 1961, White unofficially set a new air speed record when he flew the X-15 at a speed of 2,275 mph (3,661 km/h), following the installation of a 57,000 lbf (250 kN) thrust XLR-99 engine. White was the first human to fly an aircraft at Mach 4 and later Mach 5 over the next eight months.
In this instance, NASA claims that Mach 6.7 equals 7 274 km/h. You won't find that conversion from ANY conversion tool available online today. Not even Google can come-up with it. The argument that both altitude and temperature affect Mach speed is correct. These same conditions affect just the same speed measured in km/h.