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M21 Mortar Motor Carriage
The M21 Mortar Motor Carriage (MMC) was a self-propelled artillery mount on a half-track chassis used by the United States Army during World War II. It was equipped with an 81 mm M1 mortar and an air-cooled M2 Browning machine gun. It was produced by the White Motor Company in 1944. Only 110 examples were produced.
It mainly served on the Western Front in Normandy, and Southern France, and then later in the Ardennes during the Battle of the Bulge. It was deemed to have been outclassed in 1945 when the 81 mm M1 mortar was found to have insufficient power to provide effective artillery support.
== Specifications ==
The specifications for the M21 are similar to the specifications for the M3 Half-track. The vehicle was long, wide, and high〔Ness (2002), p. 207.〕 with a wheelbase of .〔Berndt (1993), p. 152.〕 The suspension for the front wheels were leaf springs and track's suspension used a vertical volute spring. Powered by a White 160AX, , , 6-cylinder petrol engine with a compression ratio of 6.3:1, the M21 could reach up to on a road.〔Norris (2012)〕 The fuel capacity was and the vehicle had a range of . It had a power-to-weight ratio of 15.8 hp/ton〔〔 with the vehicle weighing nine tons.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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