In 1914 Pullin won the Isle of Man TT race. In the 1920's he developed the Ascot car and had various helicopter engine patents.
In 1925 he developed the Powerwheel, a single cylinder rotary engine in the hub of a motorcycle wheel, including clutch and drum brakes. His sister was married to Stephen Leslie Bailey, a then prominent engineer at Douglas Motors, and many of his patents were filed under the name of that company.
Source: Graces Guide
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