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Great Britain's Light Tanks Mk IV

Photos

Light Tanks Mk IV:
Great Britain's Light Tanks Mk IV
Royal Armored Corps Tank Museum

Design

Based on an experimental "India Pattern" design by Vickers in 1933.1,6,8

Turret

The turret was positioned more towards the rear than previous Light Tanks.5 The turret was rounder that previous models. The turret had L shaped clamps that kept it from coming off.5 The turret rode on nine ball bearing rollers.5

A brake had to be released first and then each turn of the traverse wheel moved the turret 5°.5

There was a box that was located at the bottom of the tank that did move with the turret that housed the radio's batteries.5

Construction

The Light Tank Mk IV was the first to have the hull used as a chassis that had components attached.5,8 This provided a more rigid body.5 This was the first British tank to have the hull extending over the tracks.6

Suspension

There was no rear idler on the Light Tank Mk IV.5 A Horstmann suspension with two springs on each side of the bogies was used.5,8

Production

  • Light Tank Mk IV:
    • Production: 1934 - ?, 1935 - ?

Usage

Some were with front line units at beginning of war. Most were used for training.

Specifications

  Light Tank Mk IV
Crew Commander, driver.2
21,2,3,4,5,6,7,8
Physical Characteristics  
Weight 9,520 lb2
4.3 tons5, 4.5 tons3, 4.6 tons1,4,6,8
4,674 kg6,8, 4,675 kg1
Length 11' 2"1,2,4,6,8, 11' 6"5
3.4 m1,6,8
Height 6' 8.5"2, 6' 11.5"6, 7'1,6,8, 7' 1"5
2.13 m1,6,8
Width 6' 8.5"6, 6' 9"1,6,8, 6' 10"5, 6' 11.5"2
2.06 m1,6,8
Width over tracks  
Ground clearance  
Ground contact length  
Ground pressure  
Turret ring diameter  
Armament (mm)  
Main 1: .303 or .50 MG3
1: .303 cal (7.7 mm) Vickers MG2
1: Vickers .303 MG4,5
1: 7.7 mm6,8
1: 12.7 mm MG6,8
OR 1: .50 cal (12.7 mm) Vickers MG1,2
1: .50 MG4
MG  
Side arms  
Quantity  
Main 4,0005
Secondary  
MG  
Side arms  
Armor Thickness (mm) 42, 4 - 121,5, 5 - 124, 102, 123,6,8
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) Meadows1,6,8
Meadows EST5
Meadows ESTE6
Bore / stroke  
Cooling  
Cylinders 65,6,8
Capacity  
Net HP 886,8, 88@2,800 rpm5, 905
Power to weight ratio 20.7 hp/ton5
Compression ratio  
Transmission (Type)  
Steering  
Steering ratio  
Starter  
Electrical system  
Ignition  
Fuel (Type) Gasoline6,8
Octane  
Capacity  
Road consumption  
Cross country consumption  
Performance  
Traverse 360°2
Speed - Road 35 mph1,6,8, 36 mph2,3,4,5
56 kph1,6,8
Speed - Cross Country 28 mph2
Range - Road 125 miles1,5,6,8, 130 miles2
200 km1, 201 km6,8
Range - Cross Country  
Turning radius  
Elevation limits -10° to +37°2
Fording depth 2'2
Trench crossing  
Vertical obstacle  
Climbing ability  
Suspension (Type) Horstmann coil-spring2,6,8
Horstmann inclined springs parallel in bogies5
Wheels each side 4
Return rollers each side 1
Tracks (Type)  
Length  
Width 9.5"2
Diameter  
Number of links  
Pitch  
Tire tread  
Track centers/tread 5' 8.5"2

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. World War Two Tanks, George Forty, 1995
  4. Tanks of the World, 1915-1945, Peter Chamberlain, Chris Ellis, 1972
  5. AFV #5: Light Tanks Marks I-VI, Major-General N. W. Duncan
  6. The Illustrated Guide to Tanks of the World, George Forty, 2006
  7. The Encyclopedia of Weapons of World War II, Chris Bishop, 1998
  8. World War I and II Tanks, George Forty, 2012
20th Century American Military History Crucial Site