TOG Heavy Tank
Sir Albert Stern, head of the Tank Supply Depot in World War I, was asked to form a committee, to address future tank designs, in July 1939.1 Other members of the committee were Sir E. Tennyson d'Eyncourt, General Swinton, Mr. Ricardo, and Major Wilson.1 They proposed that a heavy tank be designed and approached Sir William Tritton of Foster's of Lincoln to design it.1
Members of the design team (The Old Gang) were: Stern, Wilson, Swinton, d'Eyncourt, Ricardo, Symes, and Tritton.4
The prototype was completed in October 1940 and was called the TOG I (The Old Gang)4.1 The TOG II was competed in March 1941.1 During trials both of them were found to be very hard to steer because of the relation of length to width.1
The turret was designed by Stothert & Pitt of Bath.1 With the Churchill's success, interest in the tank declined.1
TOG I:
Used a Matilda II turret.4
TOG II:
Fitted with a 76 mm (17 pdr.).1 Had 2 40 mm (2 pdr.) guns in sponsons in the hull.1 MGs were in sponsons and in the hull front.1
| TOG Heavy Tank | TOG Heavy Tank I | TOG Heavy Tank II | |
|---|---|---|---|
| Crew | 62,3, 81,2 | Driver, commander, gunner, loader, sponson gunners (4).2 64 |
Driver, commander, gunner, loaders (2), co-driver.2 84 |
| Physical Characteristics | |||
| Weight | 30 tons1 30,481 kg1 |
142,320 lb2 63.5 tons4 64,555 kg4 |
179,200 lb2 80 tons4 81,284 kg4 |
| Length w/gun | 33' 3"1,2,3,4 10.13 m1,4 |
||
| Length w/o gun | |||
| Height | 10'1,2,3,4 3.048 m1, 3.05 m4 |
||
| Width | 10' 3"1,2,3,4 3.12 m1,4 |
||
| Width over tracks | |||
| Ground clearance | |||
| Ground contact length | |||
| Ground pressure | |||
| Turret ring diameter | |||
| Armament | |||
| Main | 76 mm (17 pdr.)1 75 mm3 OR 17 pdr3 |
75 mm howitzer4 | 17 pdr OQF2,4 |
| Secondary | 2 pdr3 2: 40 mm (2 pdr.)1 |
2 pdr4 | 6 pdr (77 mm).2,4 |
| MG | 3: 7.7 mm or 7.92 mm Besa MG1 | ||
| Side arms | |||
| Quantity | |||
| Main | |||
| Secondary | |||
| MG | |||
| Side arms | |||
| Armor Thickness (mm) | 50+252, 252, 754 12 - 623 |
||
| 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) | Paxman Ricardo1,4 Ricardo3 |
||
| Bore / stroke | |||
| Cooling | |||
| Cylinders | V-124 | ||
| Capacity | |||
| Net HP | 6004 | ||
| Power to weight ratio | |||
| Ignition | |||
| Transmission (Type) | Electric. | ||
| Steering | |||
| Steering ratio | |||
| Starter | |||
| Electrical system | |||
| Ignition | |||
| Fuel (Type) | Diesel4 | ||
| Octane | |||
| Quantity | |||
| Road consumption | |||
| Cross country consumption | |||
| Performance | |||
| Traverse | 360°2 | ||
| Max speed | 8 mph1, 8.5 mph3,4 12.8 kph1, 14 kph4 |
||
| Cross country speed | 4 mph | ||
| Road radius | 50 miles4, 59 miles, 70 miles1 81 km4, 112.6 km1 |
||
| Cross country radius | |||
| Turning radius | |||
| Elevation limits | |||
| Fording depth | |||
| Trench crossing | 12' | ||
| Vertical obstacle | 7' | ||
| Climbing ability | |||
| Suspension (Type) | None, had rigid rollers. | ||
| Wheels each side | |||
| Return rollers each side | |||
| Tracks (Type) | |||
| Length | |||
| Width | |||
| Diameter | |||
| Number of links | |||
| Pitch | |||
| Tire tread | |||
| Track centers/tread | |||
| Production |
Sources:
- 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
- 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
- Tanks of the World, 1915-1945, Peter Chamberlain, Chris Ellis, 1972
- The Illustrated Guide to Tanks of the World, George Forty, 2006
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