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United States' M3A3 medium tank

Photos

M3A3 Medium Tank:
United States' M3 Medium Tank
U.S. Ordnance Dept.
M3A3 Medium Tank:
United States' M3A3 Medium Tank
Aberdeen Tank Museum

Design

All welded hull with 2 diesel engines. Side doors welded or eliminated.

Specifications

  M3A3 medium tank, Lee IV, Lee V
Crew Commander, driver, loaders(2), gunners(2).
6
Radio SCR-508
Radio - command SCR-506
Physical Characteristics  
Weight 63,000 lb, 66,480 lb
27,900 kg
Length 18' 6"
5.64-6.12 m
Height 10' 3"
3.12 m
Width 8' 11"
2.72 m
Width over tracks  
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
Side arms .45 cal submachine gun
Hand grenades
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) Twin GM 6-71, 2: General Motors 6-71, 2: GM 6-71 6046, 2: General Electric
Bore / stroke  
Cooling Liquid, Water
Cylinders 12 (6x2), 12, I-12
Capacity  
Net HP 370, 375, 375@2,100 rpm
Power to weight ratio  
Compression ratio  
Transmission (Type) Synchromesh
5 forward, 1 reverse
Steering Controlled differential
Steering ratio  
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) Diesel
Octane 50
Quantity 150 gallons
673 liters
Fuel consumption - Road  
Fuel consumption - Cross country  
Performance  
Traverse 37 mm: 360°, power or manual
75 mm: 15° left, 15° right
Speed - Road 26 mph, 29 mph
40 kph
Speed - Cross Country 16 mph
Range - Road 160 miles
241 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'
Trench crossing 6.2', 6' 2", 6' 3"
Vertical obstacle 2'
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) Steel blocks with rubber pads, rubber bushed track pins, Rubber block
Track length  
Track width 16", 16.5", 16 9/16"
Number of links 79
Pitch 6"
Tire tread Rubber
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