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Soviet Union's BT-4 Bystrochodnij Tankov (Fast Tank)

Design

Built with solid disc wheels.

Had 2 machine gun turrets and was intended for infantry support.

Intended as a commander's tank with radio equipment in the left turret.

Steering on wheels was by a wheel that controlled the front wheels. On tracks, it was steered by the clutch and brake.

Variants

  • BT-4: Two machine guns/ DT machine guns in gun turrets.
  • SU-1: Was to have a 76.2 mm cannon in a self propelled gun mount.

Usage

The BT-4 was to be used for infantry support.

Specifications

  BT-4
Crew 3
Physical Characteristics  
Weight 10.2 tons
Length 18'
Height 7.25'
Width 7.33'
Width over tracks  
Ground clearance - wheels 9"
Ground clearance - tracks 10.5"
Ground contact length 12'
Ground pressure 8.96 psi
Turret ring diameter  
Armament  
Main Left turret: 27 mm
47 mm
Secondary Right turret: 7.62 mm DTMG
MG  
Side arms  
Quantity  
Main 180
Secondary 2,709
MG  
Side arms  
Armor Thickness (mm)  
Hull Front, Upper 13
Hull Front, Lower  
Hull Sides, Upper 10 - 13
Hull Sides, Lower  
Hull Rear 10
Hull Top 6 - 10
Hull Bottom 6 - 10
Turret Front 13
Turret Sides 13
Turret Rear 13
Turret Top 10
Engine (Make / Model) Liberty Aero
Bore / stroke  
Cooling Water
Cylinders V-12
Capacity  
Net HP 343 - 400@2,000 rpm
Power to weight ratio 34.3 hp/ton
Compression ratio  
Transmission (Type) Wheels: Chain drive
Tracks: Sliding gear
Steering  
Steering ratio  
Starter  
Electrical system  
Ignition  
Fuel (Type) Gasoline
Octane  
Quantity 88 gallons
Road consumption  
Cross country consumption  
Performance  
Traverse 265°
Max speed - wheels 69 mph
Cross country speed - tracks 39 mph
Road radius - wheels 180 miles
Cross country radius - tracks 125 miles
Turning radius 40'
Elevation limits -5° to +25°
Fording depth 3.98'
Trench crossing 6.85'
Vertical obstacle 8"
Vertical obstacle - tracks 29.8"
Climbing ability  
Suspension (Type) Christie independent type
Wheels each side  
Return rollers each side  
Tracks (Type)  
Length  
Width - tire 2 x 3.95"
Width - track 10.25"
Diameter 32.5"
Number of links  
Pitch  
Tire tread  
Track centers/tread 6.33'

Sources:

  1. Profile AFV Weapons 37 Russian BT Series, John F. Milsom, 1971
  2. The Illustrated Guide to Tanks of the World, George Forty, 2006
  3. Russian Tanks and Armored Vehicles 1917-1945, by Wolfgang Fleischer, 1999
  4. Russian Tanks of World War II Stalin's Armored Might, by Tim Bean & Will Fowler, 2002
20th Century American Military History Crucial Site