Ziegler’s X–2 exploded while still attached to the mother ship, a B–29, killing Skip and a B–29 crewman. The same thing had very nearly happened to Pete Everest in the X–1D—and to Walker himself in the X–IA. Walker was strapped into the X–IA, under the bomb bay of a B–29, at 35,000 feet, seventy seconds from launch, when a fuel tank exploded in the rear of the rocket plane. Walker got out, climbed back up into the B–29, passed out from lack of oxygen, was revived by a “walkaround” oxygen bottle, went back down into the burning X–IA, and tried to jettison the rest of the fuel so as to prevent
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