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US Space Cover X-15 Test Flight 83 Pilot Jack McKay Edwards AFB CA 5/15/1963

NASA USAF NAVY Edwards Air Force Base AFB CA California

Cancellation Type: Hand Cancel

Cachet Style: Rubber stamped Mono-Color Blue Flight Cachet

Wikipedia source:

The North American X-15 was a hypersonic rocket-powered aircraft operated by the United States Air Force and the National Aeronautics and Space Administration as part of the X-plane series of experimental aircraft. The X-15 set speed and altitude records in the 1960s, reaching the edge of outer space and returning with valuable data used in aircraft and spacecraft design. The X-15's official world record for the highest speed ever recorded by a crewed, powered aircraft, set in October 1967 when William J. Knight flew at Mach 6.70 at 102,100 feet (31,120 m), a speed of 4,520 miles per hour (7,274 km/h; 2,021 m/s), has remained unbroken as of 2020.

During the X-15 program, 12 pilots flew a combined 199 flights. Of these, 8 pilots flew a combined 13 flights which met the Air Force spaceflight criterion by exceeding the altitude of 50 miles (80 km), thus qualifying these pilots as being astronauts. The Air Force pilots qualified for military astronaut wings immediately, while the civilian pilots were eventually awarded NASA astronaut wings in 2005, 35 years after the last X-15 flight.

Our extensive United States Space Cover stock spans a long period of time in the history of the US Space program, and we hope to list a large selection over the coming years. We will attempt to provide basic details on the Mission, General Description, Cancellation Location, and Specific Date. But many other details may not fit into the listing title. Please look at the pictures carefully, and click on them to enlarge them, as in many cases the cachet on the cover will provide additional details of the specific cover. If you have any questions, please do not hesitate to ask a question by messaging us.

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