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Soviet Union's Flag

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


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.


  • 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.


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


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  
Main Left turret: 27 mm
47 mm
Secondary Right turret: 7.62 mm DTMG
Side arms  
Main 180
Secondary 2,709
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
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 ratio  
Electrical system  
Fuel (Type) Gasoline
Quantity 88 gallons
Road consumption  
Cross country consumption  
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)  
Width - tire 2 x 3.95"
Width - track 10.25"
Diameter 32.5"
Number of links  
Tire tread  
Track centers/tread 6.33'


  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