The North American P-51 Mustang is the result of a direct request from the British Purchasing Commission to North American Aviation for a single seat, long-range fighter aircraft. First production models were used by the Royal Air Force for tactical reconnaissance and fighter-bombers during WWII. The North American P-51D Mustang is powered by a Rolls Royce Merlin V-1650-7 engine of 1490 hp. The cruise speed at 75% is 239 knots. The empty weight is 7125 lb and the gross weight is 11,600 lb.