The Gee Bee Sportster was a family of sports aircraft built in the United States in the early 1930s by the Granville Brothers. They were low-wing strut- and wire-braced monoplanes of conventional, if short-coupled, design, with open cockpits and fixed, tailskid undercarriage.

History

The prototype of the small series, designated Model X was built to compete in the 1930 All-American Flying Derby sponsored by the Cirrus Engine Company. The Model X, piloted by

Lowell Bayles Lowell Richard Bayles (January 24, 1900 - December 5, 1931) was an American air race and stunt pilot from the "Golden Age of Air Racing." He was the winner of the 1931 Thompson Trophy flying the Gee Bee Model Z. He was killed during an attempt ...

placed second in the race from

Detroit Detroit ( , ) is the List of municipalities in Michigan, most populous city in the U.S. state of Michigan. It is situated on the bank of the Detroit River across from Windsor, Ontario. It had a population of 639,111 at the 2020 United State ...

San Francisco San Francisco, officially the City and County of San Francisco, is a commercial, Financial District, San Francisco, financial, and Culture of San Francisco, cultural center of Northern California. With a population of 827,526 residents as of ...

and back, averaging 116.4 mph (186.7 km/h) over the 5,541 mile (8,887 km) distance. Bayles used his share of the $7,000 prize money to purchase the aircraft. The same year, two generally similar aircraft were built, one Model B and one Model C. These differed from the Model X by having landing gear that incorporated shock absorbers, as opposed to the Model X's rigid landing gear that relied on its tires for shock absorption; but while the Model B had a similar Cirrus engine to the Model X, the Model C was fitted with a Menasco B-4. The Models X, A, and B were granted only restricted registrations by the

Department of Commerce The United States Department of Commerce (DOC) is an United States federal executive departments, executive department of the Federal government of the United States, U.S. federal government. It is responsible for gathering data for business ...

, meaning that they could be flown under very specific conditions and only in specific places. In order to obtain unrestricted certification, Granville Brothers produced a revised version called the Model D, the most significant difference being a redesigned and larger tail fin. A similar fin was later fitted to the Model C, enabling it to also gain an unrestricted registration. The sole example of the Model D built was flown in competition at the Cleveland air races of 1931, where Bob Hall won the Williams Trophy with it, and Mary Haizlip placed second in two of the women's events. The definitive member of the Sportster family was the Model E, which was fitted with a

Warner Scarab The Warner Scarab is an American seven-cylinder radial engine, radial aircraft engine, that was manufactured by the Warner Aircraft Corporation of Detroit, Michigan in 1928 through to the early 1940s. In military service the engine was designate ...

radial engine in place of the inline engines used on the previous models. Four of these aircraft were built, and it was in one of them that Zantford Granville was killed in February 1934, attempting to land after an engine failure while avoiding people working on the runway below.

Variants

* Model X - ACE Ensign engine, rigid main undercarriage (one built) * Model B - ACE Ensign engine, shock absorbers (one built) * Model C - Menasco B-4 engine (one built) * Model D - Menasco C-4 engine, larger fin (one built) * Model E -

engine (four built) * Model F - Model X re-engined with a Fairchild 6-390 (one converted)

Specifications (Model E)

References

*
Holcomb's Aerodrome

{{Granville Brothers aircraft 1930s United States sport aircraft Granville Brothers aircraft Low-wing aircraft Single-engined tractor aircraft Aircraft first flown in 1930