F4U-4 CorsairF4U Corsair airplane model. The first F4U 4 Corsair was delivered to the US Navy on 31 October 1944. The F4U 4 was powered by C series Double Wasp engine. The installed model was the R 2800 18W, later replaced by the R 2800 42W. It had a war emergency power of 2760hp. A four bladed propeller replaced the three bladed one of the F4U 1. A chin scoop was added to the underside of the engine cowling. The F4U 4 could reach a speed of 726km h. The F4U 4