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Williams Helicopter 1907
J Newton Williams first design of a single-rotor helicopter, based on the French Vuitten- Huber, failed to fly with its 8hp Curtiss motor, but further experiments in league with Emile Berliner produced a two-engine, two-bladed (rotor: 18'8") machine weighing 460 lb that lifted the 150-lb Willams off the ground in a tethered flight on 26 June 1909.
Engine: 63hp Adams-Farwell

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