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Many people considered that no helicopter with real control characteristics could ever be constructed. Other pessimists said that even if you did build a helicopter, no one would need it.” However, the success of Focke and Breguet were silent sirens for the evolution of the helicopter and its future. It was a “wonderful chance to relive one’s own life all over again,” Sikorsky said. “To design a new type of flying machine without knowing how to design it; then build it without really knowing how to build it and then try to test-fly it without ever having flown a helicopter before.
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Daniel Alef (Igor I. Sikorsky: Big Dreams, Big Planes, and the Rise of Helicopters (Titans of Fortune))