M55 Self Propelled Howitzer
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M55 howitzer in the US Army Ordnance Museum
|Place of origin||United States|
|In service||1970s (Belgium)|
|Used by|| United States
|Manufacturer||Pacific Car and Foundry Co.|
|Weight||44 metric tons|
|Armour||25 mm (maximum)
(Rolled homogeneous armour)
|203.2 mm M47 howitzer
|.50 cal M2HB machine gun
(12 cylinder, 4 cycle, 90° vee gasoline)
810 hp at 2800 rpm (gross)
704 hp at 2800 rpm (net)
(two ranges forward, one reverse)
|160 mi (260 km)|
|Speed||30 mph (48 km/h)|
The M55 was an American fully enclosed and armored self-propelled artillery based on the M53 155 mm assault gun. It had a 203.2 mm howitzer which could traverse 30° left or right, carrying only 10 rounds of ammunition. The gun had a maximum range of 16,916 meters (10.51 miles) with a rate of fire of one round every two minutes. The M55 armor was light, 25 mm maximum, but sufficient to protect the crew from indirect artillery hits or small arms fire.
The M55 used components of the M47 Patton tank, but the automotive aspects were reversed. The engine was mounted in the front and drove through a front-drive sprocket. The driver's cupola is visible on the front left of the turret, and spare track blocks were stored on the turret front. Because the driver's seat was in the turret a special seat was used to keep the driver faceing forward, even when the turret wasn't.
The M55 was used during the Vietnam War, and subsequently withdrawn from service in the US military.