The Kellett Autogiro Corporation was an American aircraft manufacturer from 1929 based in Philadelphia, named after founder W. Wallace Kellett.
History The Kellett Aircraft was formed by W. Wallace Kellett and C. Townsend Ludington and their brothers, Rodney Kellett and Nicholas Ludington. In 1931, Kellett Autogiro licensed, from the Autogiro Company of America, Juan de la Cierva's and Harold Pitcairn's patents for rotary-wing aircraft. The first three designed were all typical Cierva designs and the more advanced KD-1 was similar to the contemporary Cierva C.30. The KD-1/G-1 was the first practical rotary-wing aircraft used by the United States Army. The company stopped building autogyros in the late 1940s and switched to the design of helicopters. In the 1950s it built some ultra-light helicopters the RH-1 to test some rotor features and its last design the K-25 was an experimental convertiplane using tilt-rotors.
Aircraft Model name First flight Number built Type Kellett K-2 1931 12 Utility autogyro Kellett K-3 4-6 Re-engined version of K-2 Kellett K-4 1 Re-engined version of K-2 Kellett KD-1 1934 Utility autogyro Kellett XR-8 1944 2 Single engine intermeshing rotor prototype military helicopter Kellett XR-10 1947 2 Twin engine intermeshing rotor prototype military helicopter Kellett KH-15"Known as Stable Mable" FLIGHT, 2 November 1956, p. 727 1954 Flying platform Kellett K-25"Projected Convertiplane" FLIGHT, 21 March 1958, p. 397. Twin engine convertiplane
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