Aircraft. Naval. The Vought-Sikorsky "Corsair" (F4U-1) Navy fighter, is one of the fastest warplanes in existence. Powered by a 2,000 horsepower Pratt and Whitney engine, it has a cruising speed in excess of 425 miles per hour. Its top speed is a military secret. Designed to protect the Navy's big bombers, the Corsair may be based on an aircraft carrier