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:

  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. The Illustrated Guide to Tanks of the World, George Forty, 2006
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