Contemporary photograph of a M21 Mortar Motor Carriage.
Type
Self-propelled artillery
Place of origin
United States
Service history
In service
1944–45
Used by
United States
Wars
World War II
Production history
Designer
Ordnance department
Designed
1942–43
Manufacturer
White Motor Company
Produced
1944
No. built
110
Specifications
Mass
9 tons
Length
20 ft 9 in (6.32 m)
Width
7 ft 3 in (2.22 m)
Height
7 ft 5 in (2.26 m)
Armor
Rolled face-hardened steel,
between 6–13 mm (0.24–0.51 in) thick
Main armament
81 mm M1 mortar
Secondary armament
0.5 inch (12.7 mm) M2 machine gun
Engine
White 160AX, 6,330 cc (386 in3) 6-cylinder, gasoline (petrol) compression ratio 6.3:1 128 hp (95 kW)
Power/weight
15.8 hp/ton
Suspension
tracks: Vertical volute springs; front leaf spring
Fuel capacity
60 US gal (230 L)
Operational range
150 mi (240 km)
Maximum speed
45 mph (72 km/h)
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.
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