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Nothing will ever equal that moment of exhilaration which filled my whole being when I felt myself flying away from the earth. It was not mere pleasure; it was perfect bliss...
-- Prof. Jacques Alexandre Cesare Charles, first free flight in a manned hydrogen balloon,
December 1, 1783
For the first time I was flying by jet propulsion. No engine vibrations. No torque and no lashing sound of the propeller. Accompanied by a whistling sound, my jet shot through the air. Later when asked what it felt like, I said, "It felt as though angels were pushing".
-- Generalleutnant Adolf Galland, first flight of a jet.
Leveling off at 42,000 feet, I had thirty percent of my fuel, so I turned on rocket chamber three and immediately reached .96 Mach. I noticed that the faster I got, the smoother the ride. Suddenly the Mach needle began to fluctuate. It went up to .965 Mach -- then tipped right off the scale . . . We were flying supersonic. And it was a smooth as a baby's bottom; Grandma could be sitting up there sipping lemonade.
-- General Charles 'Chuck' Yeager, first supersonic flight.
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