M12 155 mm Gun Motor Carriage
| GENERAL DATA | |||
| Other Designation(s) | - |
||
| Type | Self-Propelled Gun (Indirect Fire) |
Radio Equipment | ? |
| Manufacturer(s) | Pressed Steel
Car Co. |
||
| Crew | 6 |
Commander, driver, gun crew (4) * | |
| Production Quantity | 100 |
Production Period | April 1942 - March 1944 |
(*) 2 gun crewmen travelled in another vehicle
| DIMENSIONS | |||
| Combat weight | 29464 kg |
Ground pressure | 0.849 kg/cm² |
| Length /hull | 6.731 m |
Length w/Gun | 6.769 m |
| Barrel Overhang | 0.038 m |
Height over over gun shield | 2.883 m |
| Width | 2.675 m |
Ground clearance | 0.43 m |
| Fire height (75 mm gun) | 2.20 m |
Turret ring diameter | - |
| ARMAMENT | |||
| Primary Armament | 155mm Gun M1919, M1917A1, or M1918M1
on M4 mount (1) |
Ammunition Carried | 10 |
| Traverse | 28° (14° left and right) |
Elevation | +30° to -5° |
| Traverse speed (360°) | Manual |
Sight | ? |
| Secondary Armament | - |
Ammunition Carried | - |
| Location | 1: rear of chassis |
||
| ARMOR | ||||
| Assembly | Riveting & Cast
|
|||
| Armor Detail | Front |
Side |
Rear |
Top/Bottom |
| Hull | 51 mm / round |
19 mm / 90° |
19 mm / 80-90° |
13 mm / 0° |
| Superstructure | 38 mm /
37° (lower) 25 mm / 60° (upper) |
15.9 mm
/ 90° |
Open |
13 mm /
0° or Open |
| Gunshield | 19 mm / 90° |
- |
- |
- |
| AUTOMOTIVE | |||
| Engine | Continental R975 C1 |
Type & Displacement | R9, 15.9 liters |
| Horsepower (maximum) | 350-400 hp at 2400 rpm |
Power/Weight Ratio | 17.4 hp / ton |
| Gearbox | Synchromesh: 5 forward, 1 reverse |
Steering | Controlled differential & Steering levers |
| Brakes | Mechanical, external contracting |
Fuel Capacity | 757 L Gasoline (Petrol) |
| SUSPENSION | |||
| Type | Vertical volute spring suspension
(VVSS) |
Road wheels | 3 bogies, 2 road wheels/bogie |
| Track return rollers | 1 on top of each bogie |
Sprocket-Wheels | 13 tooth, front |
| Idler Sprockets | Adjustable, rear |
Shock absorbers | - |
| Track Type | T48, outside guides, double pin, chevron, rubber | ||
| Width | 406 or 420.6 mm |
Pitch | 150 mm |
| Links(shoes) | 79 |
Track ground contact | 3.73 m |
| Track Type | T49, outside guides, double pin, parallel bars, steel | ||
| Width | 406 or 420.6 mm |
Pitch | 150 mm |
| Links(shoes) | 79 |
Track ground contact | 3.73 m |
| Track Type | T51, outside guides, double pin, smooth, rubber | ||
| Width | 406 or 420.6 mm |
Pitch | 150 mm |
| Links(shoes) | 79 |
Track ground contact | 3.73 m |
| Track Type | T54E1, outside guides, double pin, chevron, steel | ||
| Width | 406 or 420.6 mm |
Pitch | 150 mm |
| Links(shoes) | 79 |
Track ground contact | 3.73 m |
| PERFORMANCES | |||
| Maximum Speed | 34-39 km/h on road 18 km/h off road |
Range | 230 km on road |
| Mileage | 412 L/100 km on road |
Maximum grade | 22° (from horizontal) |
| Trench crossing | 2.30 m |
Vertical obstacles | 0.61 m |
| Maximum fording depth | 1.00 m |
Minimum turning diameter | 19 m |
| Sources | |||
| AFV Database | Vehicles.com | - |
|
Drawings |
File |
/USA/Models/5-SPG/M12/Bt-off.jpg)
