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according to principles that Cierva had worked out for rotor flight, were unsuccessful. To find a solution, Cierva conducted a complete series of tests in the closed-circuit wind tunnel at Cuatro Vientos Aerodrome (designed by Emilio Herrera), at that time the best in Europe. The new, modified aircraft was successfully tested on January 9, 1923, at Getafe Aerodrome, piloted by Lieutenant Alejandro Gómez Spencer. Although this flight consisted only of a 183 m jump, it demonstrated the validity of the concept.

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