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1938 Wittman Buttercup Model W N18268

Steve Wittman designed and built Buttercup in 1938 and, over the years it has featured a variety of innovations including - tapered rod landing gear, variable camber wings with full span leading edge and slotted trailing edge flaps. The slats and flaps allow the pilot to change the shape of the wing to produce more lift at low speeds. They retract during normal flight for higher cruising speeds. This variable camber wing was quite futuristic and is used today on many high performance, commercial and military aircraft. This aircraft served as Steve Wittman’s test bed aircraft for light aircraft design for over fifty years.

Donated by: The Estate of Sylvester J. “Steve” and Paula M. Wittman, Oshkosh, WI


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