1944 North American XP-82 Twin Mustang

The North American XP-82 Twin Mustang was an American long-range fighter aircraft built to a United States Army Air Forces requirement issued in April 1944. The XP-82 was a twin-engined development of the P-51 Mustang, designed to provide improved high-altitude performance and range. It was the last piston-engined fighter ordered into production by the USAAF.
The XP-82 was powered by two Packard V-1650-23 liquid-cooled Merlin engines, each producing 1,695hp (1,267kW). It was equipped with an armament of six .50 caliber machine guns. The aircraft had an estimated top speed of 466mph (750km/h), and a range of 1,940 miles (3,120km).
The XP-82 was developed in parallel with the P-82B, which was a single-engine variant of the same aircraft. The P-82B was ordered into production in 1945. The XP-82 prototype was completed in August 1945, but further development was cancelled following the end of World War II. The aircraft never entered production or saw service.