First flown in 1940, the prototype Vought F4U Corsair instantly became the fastest fighter in the world and the fastest US aircraft of any description. Powered by a huge 18-cylinder Pratt and Whitney Double Wasp engine driving an enormous 13 feet 4 inch propeller, the first Corsairs were capable of 417mph. This figure would rise to nearly 450mph in later versions despite the fact that fuel load and overall weight was increased.