Chief Oshkosh Buster is a homebuilt racing plane designed to compete in the 1931 American Cirrus Races. 
Development.
Steve Wittman started air racing in 1926 in various aircraft. In March 1931, he designed his own purpose built aircraft in Oshkosh, Wisconsin, "Chief Oshkosh". He was racing in Cleveland by August of the same year. His goal was to keep the plane light so that he could be the first to round a pylon and establish position.
Design.
The "Chief Oshkosh" racer was a mid-winged taildragger with undersized wheels and tires without brakes. The original was powered by an American Cirrus engine, the 1932 racer was outfitted with a 349 Cubic inch Cirrus Hermes. In 1934, a smaller wing was fitted to the plane. In 1936 the plane was fitted with a Menasco CS-4 363 cubic inch engine and multiple leaf spring gear. The wing was also reduced again to . In 1937, a single piece steel landing gear was used, becoming the standard on Cessna aircraft of the future.
In 1947 "Chief Oshkosh" was rebuilt with Wittman Flying Service pilot Bill Brennand to meet the new Professional Race Pilots Association midget racing standards. A Continental C-85 engine was installed and the cockpit was moved up one bay for balance. To meet rules, brakes were installed, but they were non-functional. The aircraft also had to be demonstrated in turns up to 9 gs. Brennand used Wittman's trick of tapping the accelerometer with his knuckles to get the desired reading. The first event was the Goodyear trophy races. "Chief Oshkosh" was renamed after a cartoon character "Buster".
Operational history.
After the July 4 race, Buster was given to the Smithsonian.
Aircraft on display.
"Buster" a.k.a. "Chief Oshkosh" resides in the National Air and Space Museum in Washington, D.C.
Specifications (Wittman "Chief Oshkosh").
"Data from" Sport AviationGeneral characteristics* Capacity: 1* Aspect ratio: * Propellers: -bladed
Performance* Endurance: * g limits: * Roll rate: 
References.
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