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


Built with solid disc wheels.2

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

Intended as a commander's tank with radio equipment in the left turret.1

Steering on wheels was by a wheel that controlled the front wheels.1 On tracks, it was steered by the clutch and brake.1


  • BT-4: Two machine guns/ DT machine guns4 in gun turrets.3
  • SU-1: Was to have a 76.2 mm cannon in a self propelled gun mount.3


The BT-4 was to be used for infantry support.3


Crew 31
Physical Characteristics  
Weight 10.2 tons1
Length 18'1
Height 7.25'1
Width 7.33'1
Width over tracks  
Ground clearance - wheels 9"1
Ground clearance - tracks 10.5"1
Ground contact length 12'1
Ground pressure 8.96 psi1
Turret ring diameter  
Main Left turret: 27 mm1
47 mm2
Secondary Right turret: 7.62 mm DTMG1
Side arms  
Main 1801
Secondary 2,7091
Side arms  
Armor Thickness (mm)  
Hull Front, Upper 132
Hull Front, Lower  
Hull Sides, Upper 10 - 132
Hull Sides, Lower  
Hull Rear 102
Hull Top 6 - 102
Hull Bottom 6 - 102
Turret Front 132
Turret Sides 132
Turret Rear 132
Turret Top 102
Engine (Make / Model) Liberty Aero1
Bore / stroke  
Cooling Water1
Cylinders V-121
Net HP 343 - 400@2,000 rpm1
Power to weight ratio 34.3 hp/ton1
Compression ratio  
Transmission (Type) Wheels: Chain drive1
Tracks: Sliding gear1
Steering ratio  
Electrical system  
Fuel (Type) Gasoline1
Quantity 88 gallons1
Road consumption  
Cross country consumption  
Traverse 265°1
Max speed - wheels 69 mph1
Cross country speed - tracks 39 mph1
Road radius - wheels 180 miles1
Cross country radius - tracks 125 miles1
Turning radius 40'1
Elevation limits -5° to +25°1
Fording depth 3.98'1
Trench crossing 6.85'1
Vertical obstacle 8"1
Vertical obstacle - tracks 29.8"1
Climbing ability  
Suspension (Type) Christie independent type1
Wheels each side  
Return rollers each side  
Tracks (Type)  
Width - tire 2 x 3.95"1
Width - track 10.25"1
Diameter 32.5"1
Number of links  
Tire tread  
Track centers/tread 6.33'1


  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