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United States' M3A4 medium tank

Photos

M3A4 Medium Tank:
United States' M3A4 Medium Tank
Aberdeen Tank Museum

Design

Riveted hull.1,3 Side doors eliminated. Due to shortage of tank engines Chrysler combined 5 car engines together to provide power.1 These were nicknamed "The Eggbeater".9 The hull was lengthened and the bogie wheels spread to accommodate the 5 engines.1

Then engines were placed in a star configuration.7

Specifications

  M3A4 medium tank, Lee VI
Crew Commander, driver, loaders(2), gunners(2).4
63,4,5,7,10
Radio SCR-5083
Radio - command SCR-5063
Physical Characteristics  
Weight 64,000 lb3,5,10, 67,280 lb7
29,000 kg
Length w/gun 19' 8"3,4,5,7,10
6.15-6.63 m
Length w/o gun 6.15 m
Height 10' 3"3,4,5,7,10
Width 8' 11"3,4,5,7,10
2.64 m
Width over tracks  
Ground clearance 17 1/8"3,7,10
Ground contact length 160"3,7,10
Ground pressure 12.9 psi3,7,10, 13.36 psi
Turret ring diameter 57"3,10
Armament  
Main 75 mm M23,4
75 mm5
75 mm M2, gyrostabilized7
OR 75 mm M33,4
Secondary 37 mm M54
37 mm5
OR 37 mm M63,4,7
MG 3-4: .30 cal Browning MGs4
3: MG5
MG - cupola 1: .30 cal M1919A4 MG7
1: .30 cal Browning M1919A4 MG3
MG - coaxial 1: .30 cal M1919A4 MG7
1: .30 cal Browning M1919A4 MG3
MG - hull 1: .30 cal Browning M1919A4 MG3
2: .30 cal M1919A4 MG7
Side arms .45 cal submachine gun3
Hand grenades3,7
Quantity  
Main 463,4,7
Secondary 1783,4,7
MG 9,2003,4,7
Side arms .45 cal: 1,2003
Grenades: 123,7
Armor Thickness (mm) 124, 374
1.5" - 2"5
Hull Front, Upper 2"3, 2"@0°7
Hull Front, Lower 1.5"3
Hull Sides, Upper 1.5"3, 1.5"@0°7
Hull Sides, Lower 1.5"3
Hull Rear 1.5"3, 1.5"@0°7
Hull Top 0.5"3
Hull Bottom 0.5" - 1"3
Turret Front 2.25"3, 2.25"@0°7
Turret Sides 2.25"3, 2.25"@0°7
Turret Rear 2.25"3
Turret Top 7/8"3
Engine (Make / Model) 5: Chrysler A-57 Multibank 5,6,8,10, Chrysler A-57 Multibank3,7, Chrysler Multibank2
Bore / stroke  
Cooling Liquid3, Water7,10
Cylinders 30 (5x6)10, 303,5,7
Capacity  
Net HP 3702,5,6,7, 370@2,400 rpm3,10
Power to weight ratio  
Compression ratio  
Transmission (Type) Synchromesh3,7
5 forward, 1 reverse3,7
Steering Controlled differential7
Steering ratio  
Starter  
Electrical system 24 volt3
Ignition  
Gear ratio - 1st gear 7.56:13
- 2nd gear 3.11:13
- 3rd gear 1.78:13
- 4th gear 1.11:13
- 5th gear 0.73:13
- Reverse gear 5.65:13
Fuel (Type) Gasoline3,7,10
Octane 803,10
Quantity 160 gallons3,10, 175 miles7
Fuel consumption - Road  
Fuel consumption - Cross country  
Performance  
Traverse 37 mm: 360°3,4,7, power or manual7
75 mm: 15° left, 15° right3,4,7
Speed - Road 25 mph7, 26 mph3,4,5,10
34 kph
Speed - Cross Country 16 mph4
Range - Road 120 miles3,4,7,10
193 km
Range - Cross Country  
Turning radius 39'3,10
Elevation limits 75 mm: -9° to +20°3,4,7
37 mm: -7° to +60°3,4,7
Fording depth 3' 4"3,4,7,10
Trench crossing 6.2'3, 6' 2"7,10, 6' 3"4
Vertical obstacle 2'3,4,7,10
Climbing ability 30° slope7, 60%3
Suspension (Type) 3: Vertical Volute bogies8
Vertical volute springing3,7
Wheels each side 3 two wheeled bogies7
Wheel size 20" x 9"3
Wheel size - idler 22" x 9"3
Return rollers each side 37
Tracks (Type) Steel blocks with rubber pads, rubber bushed track pins7, Rubber block3
Track length  
Track width 16"7, 16 9/16"3, 16.5"4
Number of links 833,7
Pitch 6"3,7
Tire tread Rubber7
Track centers/tread 81"7, 6' 11"3,4,10

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. Airfix Magazine Guide #26 American Tanks of World War 2, Terry Gander and Peter Chamberlain, 1977
  3. The American Arsenal, 1996
  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. Tank Data 2, Aberdeen Proving Grounds Series, E. J. Hoffschmidt and W. H. Tantum IV, 1969
  8. Tanks of World War II, Duncan Crow, 1979
  9. Battle Winning Tanks, Aircraft & Warships of World War II, David Miller, 2000
  10. AFV 11: M3 Medium (Lee/Grant), Peter Chamberlain and Chris Ellis
20th Century American Military History Crucial Site