Juan de la Cierva
From Graces Guide
Juan de la Cierva (21 September 1895 – 9 December 1936) was a Spanish civil engineer, pilot and a self taught aeronautical engineer. His most famous accomplishment was the invention in 1920 of a rotorcraft called Autogiro, a single-rotor type of aircraft that came to be called autogyro in the English language. In 1923, after four years of experimentation, De la Cierva developed the articulated rotor, which resulted in the world's first successful flight of a stable rotary-wing aircraft, with his C.4 prototype.
Also see Cierva
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