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United States' M3A2 medium tank

Photos

M3A2 Medium Tank:
United States' M3A2 Medium Tank
Aberdeen Tank Museum

Design

All welded hull. Baldwin started production but after 12, a new engine was installed, became M3A3.

Specifications

  M3A2 medium tank, Lee III
Crew Commander, driver, loaders(2), gunners(2).
6
Radio SCR-508
Radio - command SCR-506
Physical Characteristics  
Weight 60,000 lb, 61,780 lb
27,900 kg
27.24 tons
Length 18' 6"
5.64 m
Height 10' 3"
3.12 m
Width 8' 11"
2.72 m
Ground clearance 17 1/8"
Ground contact length 147"
Ground pressure 12.9 psi, 13.25 psi, 13.36 psi
Turret ring diameter 57"
Armament  
Main 75 mm M2
75 mm
75 mm M2, gyrostabilized
OR 75 mm M3
Secondary 37 mm M5
37 mm
OR 37 mm M6
MG 3-4: .30 cal Browning MGs
3: MG
MG - cupola 1: .30 cal M1919A4 MG
1: .30 cal Browning M1919A4 MG
MG - coaxial 1: .30 cal M1919A4 MG
1: .30 cal Browning M1919A4 MG
MG - hull 1: .30 cal Browning M1919A4 MG
2: .30 cal M1919A4 MG
Side arms .45 cal submachine gun
Hand grendades
Quantity  
Main 46
Secondary 178
MG 9,200
Side arms .45 cal: 1,200
Grenades: 12
Armor Thickness (mm) 12, 37
1.5" - 2"
Hull Front, Upper 2", 2"@0°
Hull Front, Lower 1.5"
Hull Sides, Upper 1.5", 1.5"@0°
Hull Sides, Lower 1.5"
Hull Rear 1.5", 1.5"@0°
Hull Top 0.5"
Hull Bottom 0.5" - 1"
Turret Front 2.25", 2.25"@0°
Turret Sides 2.25", 2.25"@0°
Turret Rear 2.25"
Turret Top 7/8"
Engine (Make / Model) Continental R-975-EC2, Continental R-975
OR Continental R-975-C1, Continental R-975-EC1
Cooling Air
Cylinders 9, R-9
Net HP 340, 340@2,400
Transmission (Type) Synchromesh
5 forward, 1 reverse
Steering Controlled differential
Starter  
Electrical system 24 volt
Ignition  
Gear ratio - 1st gear 7.56:1
- 2nd gear 3.11:1
- 3rd gear 1.78:1
- 4th gear 1.11:1
- 5th gear 0.73:1
- Reverse gear 5.65:1
Fuel (Type) Gasoline
Octane 80
OR 92
Capacity 175 gallons
796 liters
Fuel consumption - Road  
Fuel consumption - Cross country  
Power to Weight Ratio  
Performance  
Traverse 37 mm: 360°, power or manual
75 mm: 15° left, 15° right
Speed - Road 25 mph, 26 mph
34 kph, 42 kph
Speed - Cross Country 16 mph
Range - Road 120 miles
193 km
Range - Cross Country  
Turning Radius 37'
18.9 m
Elevation Limits 75 mm: -9° to +20°
37 mm: -7° to +60°
Fording depth 3' 4"
1.02 m
Trench crossing 6.2', 6' 2", 6' 3"
1.91 m
Vertical Obstacle 2'
0.61 m
Climbing ability 30° slope, 60%
Suspension (Type) 3: Vertical Volute bogies
Vertical volute springing
Wheels each side 3 two wheeled bogies
Wheel size 20" x 9"
Wheel size - idler 22" x 9"
Return rollers each side 3
Tracks (Type) Rubber black
Steel blocks with rubber pads, rubber bushed track pins
Length  
Width 16", 16.5"
Number of Links 79
Pitch 6"
Tire Tread  
Track centers/tread 81", 6' 11"

Sources:

  1. The Encyclopedia of Tanks and Armored Fighting Vehicles - The Comprehensive Guide to Over 900 Armored Fighting Vehicles From 1915 to the Present Day, General Editor: Christopher F. Foss, 2002
  2. The American Arsenal, 1996
  3. Tank Data 2, Aberdeen Proving Grounds Series, E. J. Hoffschmidt and W. H. Tantum IV, 1969
  4. British and American Tanks of World War Two, The Complete Illustrated History of British, American, and Commonwealth Tanks 1933-1945, Peter Chamberlain and Chris Ellis, 1969
  5. Tanks of the World, 1915-1945, Peter Chamberlain, Chris Ellis, 1972
  6. The Encyclopedia of Weapons of World War II, Chris Bishop, 1998
  7. AFV 11: M3 Medium (Lee/Grant), Peter Chamberlain and Chris Ellis
  8. Tanks of World War II, Duncan Crow, 1979
20th Century American Military History Crucial Site