This Le Rhone aero engine was made in 1917 by W.M. Allen & Co Ltd. It was mounted on an Avro 504 two-seat training aircraft. It is shown mounted on a frame supporting the nose section of the Avro 504 and is cutaway to give an impression of how a rotary engine works.
The nine-cylinder 110-horsepower engine has a capacity of 15 litres. The cylinders and crankcase rotate around a fixed crankshaft with the propeller fixed to the engine, an arrangement which permits rapid cooling of the cylinders. The unit is linked to an electric motor to turn the engine.
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