The Granvilles simply streamlined a Pratt and Whitney Wasp Sr engine and added just enough wing and tail control surface area to barely keep it airborne and moving at a record speed of almost 300 mph. All this in 1932.

With the success of the Model X under their belts, the Granville brothers set out to produce and market a new line of aircraft in the Sportster series. They were billed as "The fastest and most maneuverable licensed airplane for its horsepower in the United States" - and they were all that and more. The Gee Bee Sportsters were frequently shown off at airshows by their owners, attracting much attention wherever they appeared. The prototype models for the D and E were retained by the Granville brothers for a time, and were very successful in production class racing...

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