Development
The Dragonfly was known as the Dart while in development and was based on the Mark V Douglas and an earlier 500 cc (31 cu in) prototype. Aiming to overcome the outdated image, designers were commissioned from the Reynolds Tube Company to develop a completely new open duplex frame of welded tubing, including a swinging arm with twin Girling dampers (state of the art for the time) with leading link front suspension. The strengthened and streamlined 348 cubic centimetres (21.2 cu in) engine had a modern coil ignition, AC generator and distributor, with bolt-through cast iron cylinders and heads and pushrods made from Duralumin.
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