This is the story of how converted Douglas motor cycle engines contributed to the development of private flying from 1923 to 1939. This started with competitions to develop affordable light aircraft, for which the renowned twin-cylinder motorcycle units made by Douglas of Kingswood, Bristol were emminently, if not initially perfectly, suited. Cyril J Pullin, a brilliant designer at Douglas moved to G & K Weir at Cathcart in Glasgow and became a world leader in the development of rotary-winged aircraft, assisted by another ex-Douglas engineer. This is the story of a remarkable ‘family’ of light aero engines, but it also has a good amount of detail on many of the aircraft they powered, and whilst there is an informative text, the drawings of both engines and aircraft will delight the enthusiast. 232 pages. Around 280 drawings and B&W photos. Larger format paperback. Redcliffe Press