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— Igor Sikorsky"This machine was a failure to the extent that it could not fly. In other respects it was a very important and necessary stepping stone."
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"If you look at the river in that fashion you will be likely to bathe in it soon," cried Rozier. "Some fire, my dear friend, some fire!"
— Francois Laurent d'Arlandes
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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.
— Chuck Yeager
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