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This is the sound of an O.S Sirius FR5-300 model engine being run from idle to full throttle. It may seem impossible, but this engine is of only 50cc capacity, sounding like an engine many times as big. It is installed in a 1:5 scale model of the F4U Corsair, a WW2 fighter plane that was used with great success in WW2 and, later on, in the Korean War.