In August 1947, helicopter manufacturer Kellett sold his design for the giant XH-17 Sky Crane to Hughes, who commissioned the development of the XH-17 Flying Crane research vehicle.
The KD-1/G-1 was the first practical rotary-wing aircraft used by the United States Army.
Realizing this, the Kellett Autogiro Corporation made a proposal to the USAAF on 11 November 1942 for the development of a twin-rotor helicopter that would obviate the need for a tail rotor and its attendant loss of power.
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