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The North American P-51 Mustang is an American single-seat fighter built by North American Aviation. It flew for the United States Army Air Forces and the Royal Air Force1, and once re-engined with the Rolls-Royce Merlin it became the long-range escort that could fly all the way to Berlin and back alongside the heavy bombers it protected. It remains one of the best-known fighters of the Second World War.
Design and development
North American Aviation designed the Mustang in response to a British Purchasing Commission request for a new fighter, built to a tight schedule in 1940. The prototype first flew on 26 October 19401, and the RAF took the early, Allison-engined version into service as a low-level fighter and reconnaissance aircraft, a role suited to that engine’s weak high-altitude performance.
The aircraft’s fortunes changed when British and American engineers fitted it with the Rolls-Royce Merlin1, the same engine that powered the Spitfire. Combined with a low-drag laminar-flow wing and internal fuel capacity built in from the start, the Merlin-powered Mustang gained the high-altitude speed and the range that the original version had lacked, turning it into the long-range escort fighter the Allied bomber campaign needed.
Specifications
The figures below describe the P-51D, the definitive wartime production version. It was 9.83 m long with an 11.28 m wingspan and a maximum take-off weight of 5,490 kg. It carried a single pilot and had a range of about 2,655 km with external drop tanks, the long legs that let it escort bombers deep into occupied Europe and back. Cruising speed was about 583 km/h1.
Power came from a single Packard (Rolls-Royce) V-1650-7 Merlin 12-cylinder liquid-cooled engine rated at 1,490 hp, built under licence in the United States once the Merlin conversion proved its worth. During the war the Army Air Forces paid about $51,000 for a Mustang1, modest next to a heavy bomber but a serious sum for a single-seat fighter at the time.
Variants
North American built Mustangs through several marks as the design matured, from the original Allison-engined low-level version to the Merlin-powered, bubble-canopied P-51D that became the definitive wartime model. Production ran from 1940 into the years after the war, reaching 15,686 aircraft built in total1, one of the largest production runs of any American fighter of the era.
Operators and service
The Mustang served first with the Royal Air Force and then, once re-engined with the Merlin, became a mainstay of the United States Army Air Forces1. Its range made it the fighter that could stay with American bombers all the way to targets deep in Germany, a job earlier escorts could not do, and its arrival over Berlin in strength marked a turning point in the daylight bombing campaign. Allied air forces flew it across the war’s major theatres through to its end.
The type is now retired from military service, with a number kept airworthy as warbirds1. It remains a familiar sight at air shows and in private collections decades after its combat career ended.
Safety record
Wartime loss figures for a combat type flown by multiple air forces across several theatres are not tracked as a single safety record the way a modern airliner’s are, and no consolidated figure of that kind appears in the sourced history of the type.
Similar aircraft
- Supermarine Spitfire: the British fighter that shared the Mustang’s Merlin engine and, in later marks, much of its high-altitude performance.
- Messerschmitt Bf 109: the Luftwaffe’s long-serving single-seat fighter and one of the Mustang’s principal opponents over Germany.
- Republic P-47 Thunderbolt: the other main American long-range escort fighter of the war, heavier and radial-engined where the Mustang was light and liquid-cooled.
