/Vehicles/Allies/USA/08-Halftracks/Data/M3A1-75mmGMC.htm | Up-dated:
75 mm (Half-track) Gun Motor Carriage M3A1
GENERAL DATA
Other Designation(s)
-
Type
Tank Destroyer
Radio Equipment
?
Manufacturer(s)
Autocar Co., Diamond T Motor Car Co.
Crew
6
Gun commander
in rear
Gunner
in rear
Driver
in cab left
Assistant driver
in cab right
Loaders
in rear (2)
Production Quantity
1360 converted to M3A1 personnel carriers
Date of first acceptance
August 1941
DIMENSIONS
Combat weight
9071 kg
Height over gun shield
2.50 m
Length
6.23 m
Fire height
2.08 m
over side armor
1.962 m
Ground clearance
0.284 m
Tread
1.64 m (front) - 1.62 m (rear)
Wheelbase
3.442 m
ARMAMENT
Primary Armament
75mm Gun M1897A4 (1)
Ammunition Carried
59
Traverse
40° (19° left and 21° right)
Elevation
+29° to -10° (Manual)
Traverse speed (360°)
Manual
Sight
-
Secondary Armament
.30cal (7.62 mm) M1919A4 MG (2)
Ammunition Carried
?
4 x M1 Carabines (3)
?
grenade (4)
22
Location
1: Mount M2A3, rear - 2: Flexible on pintle mount - 3/4: inside
ARMOR
Assembly
Bolting
Armor Detail
(from the horizontal)
Front
Side
Rear
Top/Bottom
Body
6.4 mm / 66° (Radiator louvres)
13 mm / 65° (Windshield cover)
6.4 mm / 90°
6.4 mm / 90°
6.4 mm / 7° (Hood top) & Open
Gunshield
15.9 mm / 78°
6.4 mm / 90°
Open
6.4 mm / 7°
AUTOMOTIVE
Engine
White 160AX
Type & Displacement
L6
Horsepower (maximum)
147 hp at 3000 rpm
Power/Weight Ratio
16.20 hp / ton
Gearbox
Spicer 3461 constant mesh:
4 forward, 1 reverse
Steering
Cam and lever, front wheels only
Brakes
?
Fuel Capacity
227 L Gasoline (Petrol)
SUSPENSION
Type
Semi-elliptic longitudinal leaf spring (Front)
Vertical volute spring (Rear)
Road wheels
Steel ventilated disc (Front)
1 bogie/track; 4 dual/bogie (rear)
Track return rollers
1 dual/track
Sprocket-Wheels
18-tooth front drive
Idler Sprockets
Adjustable fixed at rear of track
Shock absorbers
On front wheels
Track Type
Center guide band type
Width
300 mm
Pitch
100 mm
Links(shoes)
58
Track ground contact
1.187 m
PERFORMANCES
Maximum Speed
72 km/h on road
Range
280 km on road
Mileage
? L/100 km on road
Maximum grade
31° (from horizontal)
Trench crossing
0.76 m
Vertical obstacles
0.30 m
Maximum fording depth
0.81 m
Minimum turning diameter
18 m
Sources
AFV Database
OnWar.com
Vehicles.com
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File
Gun Motor Carriage