Skip to content
79,433 pages · 13,741 images · since 1994 Browse A–Z Today in space history
Encyclopedia Astronautica The full story of spaceflight
Encyclopedia entry

X-15 Flight 91

Original archive entry. The text, images and links below are kept as they were written.

X-15 in flight
X-15 in flight
Credit: NASA

Unofficial world altitude record. Maximum Speed - 6105 kph. Maximum Altitude - 107960 m. Second X-15 astronaut flight (FAI definition); fifth astronaut wings flight (USAF definition).

More at: X-15 Flight 91.

Launch Vehicles
X-15