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United States' M2A3 light tank

Photos

M2A3 Light Tank:
United States' M2A3 Light Tank
Aberdeen Tank Museum
M2A3 Light Tank:
United States' M2A3 Light Tank
Aberdeen Tank Museum

Design

Twin turrets. Improved suspension, thicker armor, increased gear ratios, better engine cooling. The .50 cal had a muzzle velocity of 2,840'/sec when firing a 710 grain shell. It could fire 400-500 rounds/minute. The .30 cal could fire 500 rounds/minute.

The suspension was improved by adding a trailing idler.

Specifications

  M2A3
Crew Commander, driver, co-driver, gunner.
4
Physical Characteristics  
Weight 19,460 lb, 20,000 lb
9.5 tons, 10 tons
Length 14' 6", 14' 6.5", 14' 7"
Height 6' 6", 7.4', 7' 4", 7' 5"
Width 7' 9.25", 8' 1.25", 8.2', 8' 4"
Width over tracks  
Ground clearance 14.5"
Ground contact length 97"
Ground pressure 9 psi, 13.75 psi
Turret ring diameter  
Armament  
Main 37 mm
3: MG
Left turret: .50 cal MG
Left turret: .50 cal HB M5 MG
Secondary Right turret: .30 cal M1919A4 MG
MG .30 cal M1919A4 MG, hull
Side arms  
Quantity  
Main .1,579
Secondary 2,380
MG 7,185
Side arms  
Armor Thickness (mm) 6, 16
5/8" - 7/8"
Front: 0.9"
Side: 0.6"
Hull Front, Upper 0.875"@0°
Hull Front, Lower  
Hull Sides, Upper 0.625"@0°
Hull Sides, Lower  
Hull Rear 0.375"@0°
Hull Top  
Hull Bottom  
Turret Front 0.9", 0.875"@0°
Turret Sides 0.625"@0°
Turret Rear  
Turret Top  
Engine (Make / Model) Continental W-670
Continental Radial
Continental WG70
Bore / stroke  
Cooling Air
Cylinders R-7
Capacity  
Net HP 250, 250@2,400 rpm
Power to weight ratio  
Compression ratio 6:1
Transmission (Type) Manual
Synchromesh
5 forward, 1 reverse
Steering Controlled differential
Steering ratio  
Starter Hand electric inertia, direct electric, and cartridge starter
Electrical system 12-volt
Ignition Magneto
Fuel (Type) Gasoline
Octane  
Quantity 54 gallons
Road consumption 1.5 mpg, 2.4 mpg
Cross country consumption  
Performance  
Traverse 360°
Each turret 180°
Hand
Speed - Road 25-30 mph, 38 mph
Speed - Cross Country 18 mph, 25 mph, 25.7 mph
Range - Road 125 miles, 130 miles
Range - Cross Country  
Turning radius  
Elevation limits -10° to +20°
Fording depth 3' 6", 3' 8"
Trench crossing 6'
Vertical obstacle 2'
Climbing ability 25° slope
26° (50%) slope
Suspension (Type) Vertical volute, Volute spring, Vertical volute spring
Wheels each side 4 , 2 double wheel bogies
Return rollers each side 2
Tracks (Type) Dry pin, double pin per shoe, rubber cleat
Steel rubber bushed pins, rubber pads
Length  
Width 7 5/8", 11.6", 11 5/8"
Diameter  
Number of links 66
Pitch 5.5"
Tire tread Rubber
Track centers/tread 6.1', 6' 1"

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. 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
  3. Tanks of the World, 1915-1945, Peter Chamberlain, Chris Ellis, 1972
  4. -
  5. Tanks of World War II, Duncan Crow, 1979
  6. Tank Data, Aberdeen Proving Grounds Series, 1968?
  7. Tank Data 2, Aberdeen Proving Grounds Series, E. J. Hoffschmidt and W. H. Tantum IV, 1969
  8. Airfix Magazine Guide #26 American Tanks of World War 2, Terry Gander and Peter Chamberlain, 1977
20th Century American Military History Crucial Site