The aircraft featured a flat, speedboat-like[3] hull with a square bow and with tailfins blended into each side.[4][5] The fins were angled to form a butterfly tail and included no moving surfaces.[5][6] The wings were mounted on struts, parasol-style, and also contained no moving surfaces.[3][6][7][8] Rather, each of the two wings could pivot independently to vary their angle of attack.[6][8] 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.[3][6] The flight controls consisted of a helicopter-style collective that varied the angle of attack of both wings simultaneously,[6][8][9] and a control wheel that varied their angles of attack in relation to one another.[6][8][10] The hull was constructed from polyurethane foam and covered with fiberglass, and the wing panels were fiberglass throughout.[6]
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.[2] With friend Elliot Dalland, Spratt began construction of the prototype (registered N2236) in 1962.[3] During the 1970s, Spratt marketed plans for the Model 107 to homebuilders.[2][11]
