Design
Although a new power plant corrected the mobility and reliability problems of the M26 Pershing, the subsequently renamed M46 was considered a stopgap solution that would be replaced later by the T42 medium tank. However, after fighting erupted in Korea, the Army decided it needed the new tank earlier than planned. It was deemed that there was not enough time to finish the development of the T42 and fix various problems that were likely to emerge in a new design. The final decision was to produce another interim solution, with the turret of the T42 mounted on the familiar hull of the M46. The composite tank, developed by the Detroit Arsenal, was named M47 Patton and entered production in 1951. Its main gun was the M36 90 mm gun with an M12 optical rangefinder fitted. The secondary armament consisted of two .30cal Browning machine guns, one in the bow of the hull and one coaxial machine gun in the turret, and a .50cal Browning M2 on a pintle mount on the turret roof. The M47 was the last American designed tank to include a bow machine gun. The T42 turret had a larger turret ring than the M26/M46 turret, and featured a needle-nose design which improved armor protection of the turret front (similar to the M60A1 tank of 1962), an elongated turret bustle and storage bin which protruded halfway across the engine deck, and the turret sides were sloped to further improve ballistic protection; this gave the turret a decidedly lozenge-shaped profile. It also featured the M12 stereoscopic rangefinder, which was designed to improve first-round hit probability but proved difficult to use; the rangefinder protruded from both sides of the upper turret front, which would be a feature of American tanks until the advent of the M1 Abrams in 1980.
Production began at the Detroit Tank Arsenal in June 1951 before the M47 was standardized for production. Delays in shipment of the M12 rangefinder and other problems due to the rushed production schedule caused a protracted testing period, and the first M47s were not fielded to the 1st and 2nd Armored Divisions until summer 1952. Standardized in May 1952, the M47 Patton's production ran until November 1953; Detroit built 5,481 tanks, and American Locomotive Company (Alco) produced 3,095, for a total production run of more 9.000 M47 Pattons.
Read more about this topic: M47 Patton
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