The Resistance of Engines: The Story of the Evolution of the Aerofoil‐section Ring applied to Radial Engines, with a Suggestion for its Wider Use

THE work which forms the subject matter of this paper relates to a device for reducing the air resistance of an air‐cooled radial engine. The device is one which can be added to the engine without completely enclosing the cylinders, either singly or collectively, in streamline casings of the conventional type, which usually render the engine inaccessible.