In 1954 USAF Colonel John P. Stapp rode this rocket sled to a speed of 632 mph on the test track at Holloman Air Force Base in New Mexico. Even more astounding is the fact that he accelerated to this speed from a dead stop in five seconds, enduring a staggering 20 Gs (G-forces) in the process. But wait, it gets more amazing still. After enduring the 20Gs of acceleration, he then decelerated from 632 mph to zero in 1.4 seconds, exposing Stapp to an astonishing 46.2 Gs.
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