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Spratt Model 107
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The Spratt Controlwing 107 was an unorthodox controlwing flying boat designed in the United States in the 1960s and marketed for home building in the 1970s.〔
The aircraft featured a flat, speedboat-like〔Spratt 1962, p.25〕 hull with a square bow and with tailfins blended into each side.〔Taylor 1977, p.565〕〔Markowski 1979, p.384〕 The fins were angled to form a butterfly tail and included no moving surfaces.〔〔Taylor 1977, p.564〕 The wings were mounted on struts, parasol-style, and also contained no moving surfaces.〔〔〔Taylor 1989, p.839〕〔Markowski 1979, p.380〕 Rather, each of the two wings could pivot independently to vary their angle of attack.〔〔 The pilot and a single passenger sat side by side in an open cockpit with a converted marine outboard motor mounted behind them that drove a pusher propeller.〔〔 The flight controls consisted of a helicopter-style collective that varied the angle of attack of both wings simultaneously,〔〔〔Spratt 1962, p.25–26〕 and a control wheel that varied their angles of attack in relation to one another.〔〔〔Spratt 1962, p.26〕 The hull was constructed from polyurethane foam and covered with fiberglass, and the wing panels were fiberglass throughout.〔
Designer George Spratt claimed that the Model 107 could not stall or spin, and that it was 75% less affected by turbulence than a conventional airplane design.〔 With friend Elliot Dalland, Spratt began construction of the prototype (registered ''N2236'') in 1962.〔 During the 1970s, Spratt marketed plans for the Model 107 to homebuilders.〔〔Gunston 1993, p.290〕
==Specifications (Controlwing 107)==
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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