13 April 1960

X-15 56-6670 with NB-52A 52-003, 13 April 1960. (NASA)
X-15 56-6670 with NB-52A 52-003, 13 April 1960. (NASA)

13 April 1960: Major Robert M. White, USAF, was the first U.S. Air Force test pilot to fly an X-15.

Carried aloft by a Boeing NB-52A Stratofortress, serial number 52-003, the first of three X-15 hypersonic research aircraft, 56-6670, was airdropped at 0915 above Rosamond Dry Lake. Major White ignited the two Reaction Motors XLR-11 rocket engines and with a burn time of 4 minutes, 13.7 seconds, the X-15 accelerated to Mach 1.9 (1,254 miles per hour/2,018 kilometers per hour) and reached 48,000 feet (14,630 meters). Both numbers were slightly short of the planned Mach 2.0 (1,320 miles per hour/2,124 kilometers per hour) and 50,000 feet (15,240 meters).

After 8 minutes, 52.7 seconds, Bob White and the X-15 touched down at Edwards Air Force Base.

This photograph shows the second North American Aviation X-15A, 56-6671, flaring to land on Rogers Dry Lake, Edwards Air Force Base, California The rear skids are just touching down. The white patches on the aircraft's belly is frost from residual cryogenic propellants remaining in its tanks. (U.S. Air Force)
This photograph shows the second North American Aviation X-15A, 56-6671, flaring to land on Rogers Dry Lake, Edwards Air Force Base, California The rear skids are just touching down. The white patches on the aircraft’s belly are frost from residual cryogenic propellants remaining in its tanks. (U.S. Air Force)

Over the next 32 months Bob White made 16 flights in the X-15. He was the first pilot to fly faster than Mach 4, Mach 5 and Mach 6. He flew it to Mach 6.04, 4,093 miles per hour (6,587  kilometers per hour) and 314,750 feet (95,936 meters), setting a Fédération Aéronautique Internationale (FAI) record for an altitude gain of 82,190 meters (269,652 feet).¹

White was one of six pilots ² awarded astronaut wings for his flights in the X-15.

Major Robert M. White exits the cockpit of an X-15 at Edwards AFB. White is wearing a David Clark Co. MC-2 full-pressure suit. (U.S. Air Force)
Major Robert M. White exits the cockpit of an X-15 at Edwards AFB. White is wearing a David Clark Co. MC-2 full-pressure suit. (U.S. Air Force)

¹ FAI Record File Number 9604

² Joe Henry Engle, William J. (“Pete”) Knight, Robert A. Rushworth, Joseph Albert Walker, Robert Michael White, and Michael James Adams (posthumous)

© 2021, Bryan R. Swopes

4 thoughts on “13 April 1960

  1. There are a few other pilots that earned their astronaut wings that you failed to mention in footnote number two. Without researching it I can name two off the top of my head. Robert Rushworth and Pete Knight.

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