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Great Britain's Medium Tank A7, The 14 Tonner

Photos

Medium Tank A7:
Great Britain's Medium Tank A7
Royal Armored Corps Tank Museum

Design

The Chief Superintendent of Design in 1929 designed an experimental tank, and three were constructed by the Royal Ordnance Factory in Woolwich.2,3

Development stopped in 1937.2

Production

  • Medium Tank A7E1: 13
    • Manufacturer: Royal Ordnance Factory at Woolwich3
    • Production: 19293
  • Medium Tank A7E2: 13
    • Manufacturer: Royal Ordnance Factory at Woolwich3
    • Production: 19293
  • Medium Tank A7E3:

Variants

  • Medium Tank A7E2: Changes in transmission and running gear.1 Later models had 2 pdr installed.1

Specifications

  Medium Tank A7E1
Crew 51,3
Physical Characteristics  
Weight 14 tons1,2,3
Length  
Height  
Width  
Ground clearance  
Ground contact length  
Ground pressure  
Turret ring diameter  
Armament  
Main 3 pdr QF1
3 pdr (47 mm)2,3
Secondary  
MG 2: .303 Vickers .303 MG1
MG - coaxial 1: MG2
1: .303 Vickers MG3
MG - hull 1: MG2
1: .303 Vickers MG3
Side arms  
Quantity  
Main  
Secondary  
MG  
Side arms  
Armor Thickness (mm) 9 - 141,3, 142
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) Armstrong-Siddeley1,2,3
Cooling Air1,2,3
Cylinders V-82
Net HP 1201,2,3
Transmission (type) Armstrong Siddeley Indirect Drive3
Steering Epicyclic3
Fuel (type)  
Octane  
Capacity  
Performance  
Traverse  
Speed - Road 25 mph1,3
Speed - Cross Country  
Range - Road 120 miles3
Turning Radius  
Elevation Limits  
Fording depth  
Trench crossing  
Vertical Obstacle  
Suspension (Type) Leaf spring3
Wheels each side  
Return rollers each side 73
Track length  
Tires  
Track width  
Track centers/tread  
  Medium Tank A7E2
Crew 53
Physical Characteristics  
Weight 14 tons2,3
Length  
Height  
Width  
Ground clearance  
Ground contact length  
Ground pressure  
Turret ring diameter  
Armament  
Main 3 pdr (47 mm)2,3
Secondary  
MG  
MG - coaxial 1: MG2
1: .303 Vickers MG3
MG - hull 1: .303 Vickers MG3
Side arms  
Quantity  
Main  
Secondary  
MG  
Side arms  
Armor Thickness (mm) 9 - 143, 142
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) Armstrong Siddeley2,3
Cooling Air2,3
Cylinders V-82
Net HP 1202,3
Transmission (type) Wilson Hydraulic3
Steering Epicyclic3
Fuel (type)  
Octane  
Capacity  
Performance  
Traverse  
Speed - Road 25 mph3
Speed - Cross Country  
Range - Road 120 miles3
Turning Radius  
Elevation Limits  
Fording depth  
Trench crossing  
Vertical Obstacle  
Suspension (Type) Single bogie with vertical volute3
Wheels each side  
Return rollers each side 73
Track length  
Tires  
Track width  
Track centers/tread  
  Medium Tank A7E3
Crew 51,3
Physical Characteristics  
Weight 18.2 tons1,2,3
Length 22' 6"1
Height 9' 1"1
Width 8' 11.5"1
Ground clearance  
Ground contact length  
Ground pressure  
Turret ring diameter  
Armament  
Main 3 pdr QF1
3 pdr (47 mm)2,3
Secondary  
MG 2: .303 Vickers MG1
MG - coaxial 1: MG2
MG - hull 1: MG2
Side arms  
Quantity  
Main  
Secondary  
MG  
Side arms  
Armor Thickness (mm) 141,2,3
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: AEC C11,3
2: AEC2
Cooling  
Cylinders 63
Net HP 2521,2,3
Transmission (type)  
Steering  
Fuel (type) Diesel1,2
Octane  
Capacity  
Performance  
Traverse  
Speed - Road 25 mph1,2,3
Speed - Cross Country  
Range - Road  
Turning Radius  
Elevation Limits  
Fording depth  
Trench crossing  
Vertical Obstacle  
Suspension (Type) Single trailing bogie with helical coil springing3
Wheels each side  
Return rollers each side  
Track length  
Tires  
Track width  
Track centers/tread  

Sources:

  1. Tanks of the World, 1915-1945, Peter Chamberlain, Chris Ellis, 1972
  2. The Royal Armoured Corps Tank Museum, Tanks 1919-1939 The Inter War Period, 1966
  3. AFV #12 Medium Marks I - III, Major-General N. W. Duncan
20th Century American Military History Crucial Site

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