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Great Britain's Mark I Heavy Tank "Mother", "HMLS Centipede", "Big Willie"

Photos

Mark I heavy tank:
Great Britain's Mark I heavy tank
Mark I heavy tank:
Great Britain's Mark I heavy tank
Mark I heavy tank:
Great Britain's Mark I heavy tank

 

 

Design

The War Office wanted a tank that could cross a 5' / 1.52 m trench and climb a 4' / 1.22 m step.1

Prototypes

In January 1916 the Mark I went through its first tests.1

Production

  • Mark I Heavy Tank: 1501
    • Production: February 1916 - ?1

Variants

  • Mark I Heavy Tank (male): Had 6 pdr guns for armament.1
  • Mark I Heavy Tank (female): Had machine guns for armament.1

Specifications

  Mark I Heavy Tank "Mother"
Crew 81
Physical Characteristics  
Weight 28 tons1
28,450 kg1
Length 32' 6"1
9.9 m1
Height 7' 11"1
2.41 m1
Width 13' 9"1
4.19 m1
Width over tracks  
Ground clearance  
Ground contact length  
Ground pressure  
Armament  
Main 2: 6 pdr (57 mm / 2.24")1
Secondary  
MG 1: 7.7 mm / 0.303" Hotchkiss MG1
Side arms  
Quantity  
Main  
Secondary  
MG  
Side arms  
Armor Thickness (mm) 121
Hull Front, Upper  
Hull Front, Lower  
Hull Sides, Upper  
Hull Sides, Lower  
Hull Rear  
Hull Top  
Hull Bottom  
Engine (Make / Model) Daimler1
Bore / stroke  
Cooling  
Cylinders 61
Capacity  
Net HP 1501
Power to weight ratio  
Ignition  
Transmission (Type)  
Steering  
Steering ratio  
Starter  
Electrical system  
Ignition  
Fuel (Type) Gasoline1
Octane  
Quantity  
Road consumption  
Cross country consumption  
Performance  
Traverse  
Speed - Road 3.7 mph1
5.95 kph1
Speed - Cross Country  
Range - Road 22 miles1
35.4 km1
Range - Cross Country  
Turning radius  
Elevation limits  
Fording depth  
Trench crossing  
Vertical obstacle  
Climbing ability  
Suspension (Type)  
Wheels each side  
Return rollers each side  
Tracks (Type)  
Length  
Width  
Diameter  
Number of links  
Pitch  
Tire tread  
Track centers/tread  

Sources:

  1. World War I and II Tanks, George Forty, 2012
20th Century American Military History Crucial Site