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Project Excelsior
Project Excelsior was a series of parachute jumps made by Colonel (then Captain) Joseph Kittinger of the United States Air Force in 1959 and 1960 from helium balloons in the stratosphere. The purpose was to test the Beaupre multi-stage parachute system intended to be used by pilots ejecting from high altitude. In one of these jumps Kittinger set world records for the highest parachute jump, the longest parachute drogue fall and the fastest speed by a human through the atmosphere. The record for fastest speed by a human through the atmosphere is now held by Felix Baumgartner of the Red Bull Stratos project.
==Background==
As jet planes flew higher and faster in the 1950s, the Air Force became increasingly worried about the safety of flight crews who had to eject at high altitude. Tests in Operation High Dive with dummies had shown that a body in free-fall at high altitude would often go into a flat spin at a rate of up to 200 revolutions per minute. This would be potentially fatal.
Project Excelsior was initiated in 1958 to design a parachute system that would allow a safe, controlled descent after a high-altitude ejection. Francis Beaupre, a technician at Wright-Patterson AFB, Ohio, devised a multi-stage parachute system to facilitate manned tests. This consisted of a small stabilizer or "drogue" parachute, designed to prevent uncontrolled spinning at high altitudes, and a main parachute that deployed at a lower altitude. The system included timers and altitude sensors that automatically deployed both parachutes at the correct points in the descent, even if the parachutist were unconscious or disabled.
To test the parachute system, staff at Wright Field built a high helium balloon with a capacity of nearly that could lift an open gondola and test pilot into the stratosphere. Kittinger, who was test director for the project, made three ascents and test jumps. As the gondola was unpressurized, Kittinger had to wear a full pressure suit during these tests, plus additional layers of clothing to protect him from the extreme cold at high altitude. Together with the parachute system, this almost doubled his weight.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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