Grant Mark I

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Grant Mark I

GENERAL DATA
Other Designation(s)	M3 Medium Tank (US Army)
Type	Cruiser Tank	Radio Equipment	N°19
Manufacturer(s)	Rock Island Arsenal, Detroit Tank Arsenal; American Locomotive Works
Crew	7	Commander: Turret - Rear-left corner 37 mm Gunner: Turret - Rear-left corner 37 mm Loader: Turret - Right-center 75 mm Gunner: Hull - Front-left corner 75 mm Loader: Hull - Right-center Driver: Hull - Front-center Assistant driver: Hull - Center
Production Quantity	242	Production Period	1941-1942

DIMENSIONS
Combat weight with T48 or T51 tracks	28100 kg	Ground pressure	0.885 kg/cm²
Length /hull	5.64 m	Length w/Gun	5.64 m (M2 Gun) or 6.12 m (M3 Gun)
Barrel Overhang	0 m (M2 Gun) or 0.48 m (M3 Gun)	Height	3.02 m
Width with side doors	2.72 m	Ground clearance	0.43 m
Fire height (75 mm gun)	1.75 m	Turret ring diameter	1.38 m

ARMAMENT
Primary Armament	75 mm Gun M2 or M3 on M1 mount (1)	Ammunition Carried	65
	37 mm Gun M5 or M6 on M24 mount (2)		128
Traverse	75mm: 30° (15° Left or Right)	Elevation	75mm: -9° to +20° (stabilizer)
	37 mm: 360° (manual or hydraulic)		37mm: -7° to +60° (stabilizer)
Traverse speed (360°)	75 mm: Manual	Sight	?
	37mm: 18°/sec.		?
Secondary Armament	3 x .30 caliber MG M1919A4 (7.62 mm) (3)	Ammunition Carried	4084
Location	1: hull right - 2: turret - 3: bow (2), coaxial - 4: turret inside

ARMOR
Assembly	Riveting & Cast
Armor Detail (from the horizontal)	Front	Side	Rear	Top/Bottom
Hull	51 mm / round	38 mm / 90°	38 mm / 80-90°	25 mm / 0°(front) 13 mm / 0°(rear)
Superstructure	38 mm / 37° (lower) 51 mm / 60° (upper)	38 mm / 90°	38 mm / 80°	13 mm / 0-7°
Turret	76 mm / 43° & round	51 mm / 85° & round	51 mm / 90° & round	32 mm / 0&9°
Mantlet	?	-	-	-

AUTOMOTIVE
Engine	Continental R975 C1	Type & Displacement	R9, 15.9 liters
Horsepower (maximum)	350-400 hp at 2400 rpm	Power/Weight Ratio	14.3 hp / ton
Gearbox	Synchromesh: 5 forward, 1 reverse	Steering	Controlled differential & Steering levers
Brakes	Mechanical, external contracting	Fuel Capacity	796 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	193 km on road
Mileage	412L/100km on road	Maximum grade	31° (from horizontal)
Trench crossing	2.30 m	Vertical obstacles	0.61 m
Maximum fording depth	1.00 m	Minimum turning diameter	19 m

Sources
OnWar.com	Vehicles.com	TNT Hors-Série n°6	-

Drawings

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