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Landgraf H-2
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The Landgraf H-2 was an American single-seat twin-rotor helicopter designed by Fred Landgraf and built by the Landgraf Helicopter Company of Los Angeles, California. Although awarded a development contract by the United States Army it was not developed and was overtaken by more advanced designs.
==Design and development==
Fred Landgraf formed the Landgraf Helicopter Company in September 1943 to develop and manufacture the H-2. It had an enclosed structure for one pilot and an 85 hp (63 kW) radial engine driving two rotors, each rotor fitted to a short boom on each side of the fuselage. It had a fixed tricycle landing gear. The H-2 first flew on 2 November 1944 and the company was awarded a development contract by the United States Army. It was not developed or bought and the company ceased operations by the end of the 1940s.
Unlike conventional helicopters, the H-2 used a tension-rod drive system to drive the side-by-side rotors. Control of blade pitch was also unconventional, with the blade shells rotating freely about the spars, controlled by ailerons near the tips.〔(【引用サイトリンク】url=https://sites.google.com/site/stingrayslistofrotorcraft/landgraf-model-h-2 )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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