50 caliber (12.7 mm) AN/M2 Browning machine guns. The definitive version, the P-51D, was powered by the Packard V-1650-7, a license-built version of the two-speed, two-stage- supercharged Merlin 66, and was armed with six. Replacing the Allison with a Rolls-Royce Merlin resulted in the P-51B/C (Mustang Mk III) model, and transformed the aircraft's performance at altitudes above 15,000 ft (4,600 m) (without sacrificing range), allowing it to compete with the Luftwaffe 's fighters. The aircraft was first flown operationally by the RAF as a tactical-reconnaissance aircraft and fighter-bomber (Mustang Mk I). The Mustang was designed to use the Allison V-1710 engine, which had limited high-altitude performance in its earlier variants. The prototype NA-73X airframe was rolled out on 9 September 1940, 102 days after the contract was signed, and first flew on 26 October. Rather than build an old design from another company, NAA proposed the design and production of a more modern fighter. The commission approached NAA to build Curtiss P-40 fighters under license for the Royal Air Force (RAF). Kindelberger of North American Aviation (NAA) in response to a requirement of the British Purchasing Commission. The Mustang was designed in April 1940 by a team headed by James H. The North American Aviation P-51 Mustang is an American long-range, single-seat fighter and fighter-bomber used during World War II and the Korean War, among other conflicts. Still used in air racing by civilians and as warbirds. Retired from military service 1984 (Dominican Air Force).
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