We understand that ballistic parachutes for GA have not been deployed at high altitudes, only the military have done that, apparently successfully. According to BRS, in thin air there would be a longer free fall until the chute opens. BRS says their parachute typically needs a 2000 ft. fall to fully open.
However, the GFC will be flown at ≥ 4000 feet MSL with generally ≥ 3500 feet AGL most of the course. More.
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