Dr G A Spratt’s first powered airplane with pivoting wings was a single-place, open cockpit biplane, built in 1912, and powered by a 40hp Curtiss V-8 air-cooled engine.

The second controlwing was a single-place open cockpit high-wing monoplane built in 1934, powered by a 25hp Jacobs outboard motor modified to air cooling (now in EAA Museum), and registered N14763. With an empty weight of 180 lb, it was the first controlwing airplane to do any real flying.

The 1939 Controlwing further development of Spratt’s controllable-wing theory was a two place, open cockpit, mid-wing flying boat. A 65hp Lycoming pusher engine was mounted in the bow, driving a prop by a long shaft. The wing is mounted over a twin-tailed, boat-shaped fuselage.

The 1947 version, N3915A, had a 65hp Continental mounted aft of the cockpit. Spratt’s project continued well into the 1970s with several successful flying boats. Plans marketed to home-builders; 80 sets sold by 1982.

The 1973 Controlwing 105 N49888 was a two-place cabin, high-wing monoplane landplane with a 60ci Mercury marine engine. The span was 22’0″ and length 12’6″. Spratt’s continuance of design numbers from his days at Convair sometimes lead to confusion of this plane with Convair-Stinson 106 Skycoach.

The 1964 Controlwing 106 N910Z was a two-place, open cockpit high-wing monoplane flying boat.

Circa 1975 the Controlwing 107 was a two-place, open cockpit high-wing monoplane flying boat, powered by a modified 80hp Mercury marine engine. The span was 24’0″, length 17’0″, and useful load: 500 lb.

Seats: 2