M19 Twin 40 mm Gun Motor Carriage
Aberdeen Tank Museum
Note the ammunition containers around the edge of the turret.
It was to replace the Combination Gun Motor Carriage M15A1.
Standardized in June 1944.
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.
Was designed to protect motor columns against aircraft.
| M19 Twin 40 mm Gun Motor Carriage | M19A1 | |
|---|---|---|
| Crew | Commander, Driver, Assistant driver, gun crew (3) 62 |
62 |
| Physical Characteristics | ||
| Weight | 38,500 lb 20 tons2 |
20.58 tons2 |
| Length w/gun | 17.08'2, 17' 11" | 18.17'2 |
| Length w/o gun | ||
| Height | 9' 9.5", 9.92'2 | 9.75'2 |
| Width | 9.33'2, 9' 4" | 9.58'2 |
| Width over tracks | ||
| Ground clearance | 17", 18 3/8"2 | 16.5"2 |
| Ground contact length | 124", 12.5'2 | 12.5'2 |
| Ground pressure | 9.4 psi2, 9.7 psi | 10.1 psi2 |
| Turret ring diameter | 31" | |
| Armament | ||
| Main | 40 mm Dual Automatic Gun M2 2: 40 mm2 |
2: 40 mm, M2 turret2 |
| Secondary | ||
| MG | ||
| Side arms | 4: M1 Carbines M3 .45 Submachine Gun Grenades |
|
| Quantity | ||
| Main | 336, 3522 | 3502 |
| Secondary | ||
| MG | ||
| Side arms | 480 570 22 |
|
| Armor Thickness (mm) | Front: 0.5"2 Side: 0.5"2 |
Front: 0.5"2 Side: 0.5"2 |
| 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 44T242 | 2: Cadillac 44T242 |
| Bore / stroke | ||
| Cooling | Water2 | Water2 |
| Cylinders | V-82 | V-82 |
| Capacity | ||
| Net HP | 110@3,400 rpm2 | 110@3,400 rpm2 |
| Power to weight ratio | ||
| Compression ratio | 7.06:12 | 7.06:12 |
| Transmission (Type) | Hydramatic2 High, medium, low ranges2 |
Hydramatic2 High, medium, low ranges2 |
| Steering | Controlled differential2 | Controlled differential2 |
| Steering ratio | ||
| Starter | Electric2 | Electric2 |
| Electrical system | 24-volt2 | 24-volt2 |
| Ignition | Distributor2 | Distributor2 |
| Fuel (Type) | ||
| Octane | ||
| Quantity | 110 gallons2, 115 gallons | 110 gallons2 |
| Road consumption | 0.87 mpg2 | 0.77 mpg2 |
| Cross country consumption | ||
| Performance | ||
| Traverse | 360°2 | 360°2 |
| Max speed | 35 mph2 | 30 mph2 |
| Cross country speed | 11 mph | |
| Road radius | 97 miles2, 100-160 miles | 85 miles2 |
| Cross country radius | ||
| Turning radius | 20' | |
| Elevation limits | -5° to +85° | |
| Fording depth | 3' 6"2 | 3.5'2 |
| Trench crossing | 8'2 | 7.3'2 |
| Vertical obstacle | 3'2, 3' 4" | |
| Climbing ability | 31° (60%)2 | 31° (60%)2 |
| Suspension (Type) | Torsion bar suspension2 | Torsion bar2 |
| Wheels each side | 52, 10 | 52 |
| Return rollers each side | 42 | 42 |
| Tracks (Type) | Steel links, T72, single pin2 | Steel links, T72, single pin2 |
| Length | ||
| Width | 16"2 | 16"2 |
| Diameter | ||
| Number of links | 782 | 782 |
| Pitch | 6"2 | 6"2 |
| Tire tread | ||
| Track centers/tread | 8'2 | 8'2 |
| Production | Cadillac (Detroit), Massey-Harris (Milwaukee): 2851 Cadillac Motor Car Division (GMC)2 |
Cadillac Motor Car Division (GMC)2 |
Sources:
- Tanks of World War II, Duncan Crow, 1979
- Tank Data, Aberdeen Proving Grounds Series, 1968?
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