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United States' M19 Twin 40 mm Gun Motor Carriage

Photos

M19 Twin 40 mm Gun Motor Carriage:
United States' M19 Twin 40 mm Gun Motor Carriage
Aberdeen Tank Museum

Design

The M19 used the M24 Light Tank chassis. It was to replace the Combination Gun Motor Carriage M15A1 to protect motor columns against aircraft.

Standardized in June 1944.

Main Armament

40 mm gun's AP shell had velocity of 2,870 ft/sec, range of 9,475 and could penetrate 1.6" at 1,000 yards. HE shell had velocity of 2,870, range of 10,820 yards, and ceiling of 7,625 yards. Could be fired at 240 rounds/minute, and traversed up to 40° per second.

Production

  • M19: 285
    • Manufacturer: Cadillac (Detroit), Massey-Harris (Milwaukee), Cadillac Motor Car Division (GMC)
  • M19A1:
    • Manufacturer: Cadillac Motor Car Division (GMC)

Specifications

  M19 Twin 40 mm Gun Motor Carriage
Crew Commander, Driver, Assistant driver, gun crew (3)
6
Physical Characteristics  
Weight 38,500 lb
20 tons
Length 17.08', 17' 11"
Height 9' 9.5", 9.92'
Width 9.33', 9' 4"
Width over tracks  
Ground clearance 17", 18 3/8"
Ground contact length 124", 12.5'
Ground pressure 9.4 psi, 9.7 psi
Turret ring diameter 31"
Armament  
Main 40 mm Dual Automatic Gun M2
2: 40 mm
Secondary  
MG  
Side arms 4: M1 Carbines
M3 .45 Submachine Gun
Grenades
Quantity  
Main 336, 352
Secondary  
MG  
Side arms 480
570
22
Armor Thickness (mm) Front: 0.5"
Side: 0.5"
Hull Front, Upper 12
Hull Front, Lower 12
Hull Sides, Upper 12
Hull Sides, Lower 12
Hull Rear 6
Hull Top 12
Hull Bottom 12
Turret Front 12
Turret Sides 8
Turret Rear  
Turret Top  
Engine (Make / Model) 2: Cadillac 44T24
Bore / stroke  
Cooling Water
Cylinders V-8
Capacity  
Net HP 110@3,400 rpm
Power to weight ratio  
Compression ratio 7.06:1
Transmission (Type) Hydramatic
High, medium, low ranges
Steering Controlled differential
Steering ratio  
Starter Electric
Electrical system 24-volt
Ignition Distributor
Fuel (Type)  
Octane  
Quantity 110 gallons, 115 gallons
Road consumption 0.87 mpg
Cross country consumption  
Performance  
Traverse 360°
Speed - Road 35 mph
Speed - Cross Country 11 mph
Range - Road 97 miles, 100-160 miles
Range - Cross Country  
Turning radius 20'
Elevation limits -5° to +85°
Fording depth 3' 6"
Trench crossing 8'
Vertical obstacle 3', 3' 4"
Climbing ability 31° (60%)
Suspension (Type) Torsion bar suspension
Wheels each side 5, 10
Return rollers each side 4
Tracks (Type) Steel links, T72, single pin
Length  
Width 16"
Diameter  
Number of links 78
Pitch 6"
Tire tread  
Track centers/tread 8'
  M19A1
Crew 6
Physical Characteristics  
Weight 41,165 lb
20.58 tons
Length 18.17', 18' 2"
Height 9.75', 9' 5"
Width 9.58', 9' 7"
Width over tracks  
Ground clearance 1' 4", 1' 4.5"
Ground contact length 12.5'
Ground pressure 9.7 psi, 10.1 psi
Turret ring diameter  
Armament  
Main 2: 40 mm
2: 40 mm, M2 turret
Secondary  
MG  
Side arms  
Quantity  
Main 350
Secondary  
MG  
Side arms  
Armor Thickness (mm) Front: 0.5"
Side: 0.5"
Hull Front, Upper  
Hull Front, Lower  
Hull Sides, Upper  
Hull Sides, Lower  
Hull Rear  
Hull Top  
Hull Bottom  
Turret Front  
Turret Sides  
Turret Rear  
Turret Top  
Engine (Make / Model) 2: Cadillac 44T24
Bore / stroke  
Cooling Water
Cylinders V-8
Capacity  
Net HP 2: 110
110@3,400 rpm
Power to weight ratio  
Compression ratio 7.06:1
Transmission (Type) Hydramatic
High, medium, low ranges
Steering Controlled differential
Steering ratio  
Starter Electric
Electrical system 24-volt
Ignition Distributor
Fuel (Type)  
Octane  
Quantity 110 gallons
Road consumption 0.77 mpg
Cross country consumption  
Performance  
Traverse 360°
Speed - Road 30 mph, 30 - 35 mph
Speed - Cross Country  
Range - Road 85 miles, 100 miles
Range - Cross Country  
Turning radius 23'
Elevation limits  
Fording depth 3' 6"
Trench crossing 7.3', 7' 4"
Vertical obstacle 2' 8"
Climbing ability 31° (60%)
Suspension (Type) Torsion bar
Wheels each side 5
Return rollers each side 4
Tracks (Type) Steel links, T72, single pin
Length  
Width 16"
Diameter  
Number of links 75, 78
Pitch 6"
Tire tread  
Track centers/tread 8'

Sources:

  1. Tanks of World War II, Duncan Crow, 1979
  2. Tank Data, Aberdeen Proving Grounds Series, 1968?
  3. Profile AFV Weapons #46 Light Tanks M22 Locust and M24 Chaffee, Colonel Robert J. Icks, 1972
20th Century American Military History Crucial Site