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“Although the helmets appeared to be properly configured, each helmet had multiple failures, likely caused by windblast during the ejection sequence.”

He suffered broken bones and detached retinas, but out of these wild rides - by December 1954, Stapp had volunteered for 29 rocket sled deceleration and windblast experiments - came improved helmets, arm and leg restraints, better aircraft seats, stronger safety harnesses and techniques for positioning the body to help absorb powerful forces.