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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.1,3,8 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).4
62,3,4,5,6,7
Radio SCR-5082
Radio - command SCR-5062
Physical Characteristics  
Weight 60,000 lb2,5,7, 61,780 lb3
27,900 kg
27.24 tons6
Length 18' 6"2,3,4,5,6,7
5.64 m6
Height 10' 3"2,3,4,5,6,7
3.12 m6
Width 8' 11"2,3,4,5,6,7
2.72 m6
Ground clearance 17 1/8"2,3,7
Ground contact length 147"2,3,7
Ground pressure 12.9 psi, 13.25 psi3, 13.36 psi2,7
Turret ring diameter 57"2,7
Armament  
Main 75 mm M22,4
75 mm5
75 mm M2, gyrostabilized3
OR 75 mm M32,4
Secondary 37 mm M52,4
37 mm 5
OR 37 mm M62,3,4
MG 3-4: .30 cal Browning MGs4
3: MG5
MG - cupola 1: .30 cal M1919A4 MG3
1: .30 cal Browning M1919A4 MG2
MG - coaxial 1: .30 cal M1919A4 MG3
1: .30 cal Browning M1919A4 MG2
MG - hull 1: .30 cal Browning M1919A4 MG2
2: .30 cal M1919A4 MG3
Side arms .45 cal submachine gun2
Hand grendades2,3
Quantity  
Main 462,3,4
Secondary 1782,3,4
MG 9,2002,3,4
Side arms .45 cal: 1,2002
Grenades: 122,3
Armor Thickness (mm) 124, 374
1.5" - 2"5
Hull Front, Upper 2"2, 2"@0°3
Hull Front, Lower 1.5"2
Hull Sides, Upper 1.5"2, 1.5"@0°3
Hull Sides, Lower 1.5"2
Hull Rear 1.5"2, 1.5"@0°3
Hull Top 0.5"2
Hull Bottom 0.5" - 1"2
Turret Front 2.25"2, 2.25"@0°3
Turret Sides 2.25"2, 2.25"@0°3
Turret Rear 2.25"2
Turret Top 7/8"2
Engine (Make / Model) Continental R-975-EC22,3,6,7, Continental R-9755
OR Continental R-975-C17, Continental R-975-EC12
Cooling Air2,3,7
Cylinders 95,7, R-92,3
Net HP 3403,5,6, 340@2,4002,7
Transmission (Type) Synchromesh2,3
5 forward, 1 reverse2,3
Steering Controlled differential3
Starter  
Electrical system 24 volt2
Ignition  
Gear ratio - 1st gear 7.56:12
- 2nd gear 3.11:12
- 3rd gear 1.78:12
- 4th gear 1.11:12
- 5th gear 0.73:12
- Reverse gear 5.65:12
Fuel (Type) Gasoline2,3,6,7
Octane 802,7
OR 922,7
Capacity 175 gallons2,3,7
796 liters
Fuel consumption - Road  
Fuel consumption - Cross country  
Power to Weight Ratio  
Performance  
Traverse 37 mm: 360°2,3,4, power or manual3
75 mm: 15° left, 15° right2,3,4
Speed - Road 25 mph3, 26 mph2,4,5,6,7
34 kph, 42 kph6
Speed - Cross Country 16 mph4
Range - Road 120 miles2,3,4,6,7
193 km6
Range - Cross Country  
Turning Radius 37'2,7
18.9 m
Elevation Limits 75 mm: -9° to +20°2,3,4
37 mm: -7° to +60°2,3,4
Fording depth 3' 4"2,3,4,6,7
1.02 m6
Trench crossing 6.2'2, 6' 2"3,7, 6' 3"4,6
1.91 m6
Vertical Obstacle 2'2,3,4,6,7
0.61 m6
Climbing ability 30° slope3, 60%2
Suspension (Type) 3: Vertical Volute bogies8
Vertical volute springing3
Wheels each side 3 two wheeled bogies3
Wheel size 20" x 9"2
Wheel size - idler 22" x 9"2
Return rollers each side 33
Tracks (Type) Rubber black2
Steel blocks with rubber pads, rubber bushed track pins3
Length  
Width 16"3, 16.5"4
Number of Links 792,3
Pitch 6"2,3
Tire Tread  
Track centers/tread 81"3, 6' 11"2,4,7

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