The X-15A-2 (serial number AF56-6671), was a modified version of the X-15 rocket plane, specifically designed to allow longer engine burn times and to attain hypersonic velocities in the range of 8000 feet per second at an altitude of 100,000 feet. The main modifications were the addition of a 29-inch fuselage section to the center of gravity compartment and two large aluminum external propellant tanks which can be jettisoned and reused. The added propellant permits alonger engine run which results in added velocity.
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