|Mission type||Test flight|
|Operator||US Air Force/NASA|
|Mission duration||11 minutes, 24 seconds|
|Distance travelled||534 kilometers (332 mi)|
|Apogee||106.01 kilometers (65.87 mi)|
|Launch mass||15,195 kilograms (33,499 lb)|
|Landing mass||6,260 kilograms (13,800 lb)|
|Dry mass||6,577 kilograms (14,500 lb)|
|Members||Joseph A. Walker|
|Start of mission|
|Launch date||July 19, 1963, 18:20:05UTC|
|Launch site||Balls 8, Edwards|
Dropped over Smith Ranch Dry Lake
|End of mission|
|Landing date||July 19, 1963, 18:31:29.1UTC|
|Landing site||Rogers Dry Lake, Edwards|
X-15 Flight 90 pilot, Joe Walker
Flight 90 of the North American X-15 was a research flight conducted by NASA and the US Air Force in 1963. It was the first of two X-15 missions that passed the 100-km high Kármán line, the FAI definition of space, along with Flight 91 the next month. The X-15 was flown by Joseph A. Walker, who flew both X-15 spaceflights.
|Pilot||Joseph A. Walker|
First (FAI-recognized) / Second (U.S.-recognized) spaceflight
Maximum Speed - 5,971 km/h. Maximum Altitude - 106,010 m. 80 cm diameter balloon towed on 30 m line to measure air density. First X-15 flight over 100 km (a height known as the Kármán line). This made Walker the first US civilian in space. This was also the first spaceflight of a spaceplane in aviation history. First flight launched over Smith Dry Lake, NV. Experiments: Towed balloon, horizon scanner, photometer, infrared and ultraviolet. Balloon instrumentation failed.
The mission was flown by X-15 #3, serial 56-6672 on its 21st flight.
Launched by: NB-52B #008, Pilots Fulton & Bement. Takeoff: 17:19. UTC Landing: 19:04 UTC.
Chase pilots: Crews, Dana, Rogers, Daniel and Wood.
The X-15 engine burned about 85 seconds. Near the end of the burn, acceleration built up to about 4g (39 m/s²). Weightlessness lasted for 3 to 5 minutes. Re-entry heating warmed the exterior of the X-15 to 650 °C in places. During pull up after re-entry, the acceleration built up to 5g (49 m/s²) for 20 seconds. The entire flight lasted about 12 minutes from launch to landing.