__NOTOC__ The Spratt Controlwing 107 was an unorthodox controlwing

flying boat A flying boat is a type of fixed-winged seaplane with a hull, allowing it to land on water. It differs from a floatplane in that a flying boat's fuselage is purpose-designed for floatation and contains a hull, while floatplanes rely on fusela ...

designed in the United States in the 1960s and marketed for

home building Home construction or residential construction is the process of constructing a house, apartment building, or similar residential building generally referred to as a ' home' when giving consideration to the people who might now or someday reside ...

in the 1970s. The aircraft featured a flat, speedboat-likeSpratt 1962, p.25 hull with a square bow and with tailfins blended into each side.Taylor 1977, p.565Markowski 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.839Markowski 1979, p.380 Rather, each of the two wings could pivot independently to vary their

angle of attack In fluid dynamics, angle of attack (AOA, α, or \alpha) is the angle between a reference line on a body (often the chord line of an airfoil) and the vector representing the relative motion between the body and the fluid through which it is m ...

. 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, and a control wheel that varied their angles of attack in relation to one another. 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)

Notes

References

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External links

AerofilesSpratt "Wingdinghy"
in ''Popular Mechanics'', June 1962 {{Spratt aircraft 1970s United States sport aircraft Flying boats Homebuilt aircraft Spratt aircraft V-tail aircraft Single-engined pusher aircraft Parasol-wing aircraft Aircraft first flown in 1967