9th Day of January

1923 – The first autogyro flight

Juan de la Cierva y Codorníu, 1st Count of la Cierva (Spanish pronunciation: 21 September 1895 in Murcia, Spain – 9 December 1936 in Croydon, United Kingdom) was a Spanish civil engineer, pilot and aeronautical engineer.

His most famous accomplishment was the invention in 1920 of the first helicopter called Autogiro, a single-rotor type of aircraft that came to be called autogyro in the English language.

1923 – The first autogyro flight

On 9th January, 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.

Extra Note: De la Cierva’s work on rotor dynamics and control made possible the modern helicopter, whose development as a practical means of flight had been prevented by these problems.

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https://en.wikipedia.org/wiki/Juan_de_la_Cierva

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