History
The RL10 was first tested on the ground in 1959, at the Florida Research and Development Center in West Palm Beach, Florida (SSFL) of Pratt and Whitney. It was first flown in 1962 in an unsuccessful suborbital test; the first successful flight took place on November 27, 1963. For that launch, two RL10A-3 engines powered the Centaur upper stage of an Atlas launch vehicle. The launch was used to conduct a heavily instrumented performance and structural integrity test of the vehicle.
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