Engle helped to flight test the joint NASA-Air Force X-15 rocket airplane.
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Engle test-flew the joint NASA-Air Force X-15 rocket airplane.
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Just 20 days later, on the morning of 27 September, Apt was launched from the B-50 for his first flight in a rocket airplane.
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Yeager's historic flight _ made when a civilian pilot turned down the job because he wouldn't get a cash bonus _ paved the way for today's supersonic fighters and for future rocket airplanes.
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Engle helped to flight test the joint NASA-Air Force X-15 rocket airplane and was one of the first astronauts in the Space Shuttle program, having flight tested the Space Shuttle Enterprise in 1977.
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A fictional account of British national policy in 1939, it tells how Britain's secretary of state tried to keep world peace, even with the Royal Air Force aggressively brandishing rocket airplanes and an atomic bomb.
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His last full study was on the " Orbital Rocket Airplane " which used both tripropellant and ( in some versions ) a plug nozzle, resulting in a spaceship only slightly larger than a Lockheed SR-71, able to operate from traditional runways.
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