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 | |
|---|---|
| Crew | 31 |
| Physical Characteristics | |
| Weight | 10.2 tons1 |
| Length w/gun | 18'1 |
| Length w/o gun | |
| Height | 7.25'1 |
| Width | 7.33'1 |
| Width over tracks | |
| Ground clearance | Wheels: 9"1 Tracks: 10.5"1 |
| Ground contact length | 12'1 |
| Ground pressure | 8.96 psi1 |
| Turret ring diameter | |
| Armament | |
| Main | Left turret: 27 mm1 47 mm2 |
| Secondary | Right turret: 7.62 mm DTMG1 |
| MG | |
| Side arms | |
| Quantity | |
| Main | 1801 |
| Secondary | 2,7091 |
| MG | |
| 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 |
| Capacity | |
| 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 | |
| Steering ratio | |
| Starter | |
| Electrical system | |
| Ignition | |
| Fuel (Type) | Gasoline1 |
| Octane | |
| Quantity | 88 gallons1 |
| Road consumption | |
| Cross country consumption | |
| Performance | |
| 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 | Wheels: 8"1 Tracks: 29.8"1 |
| Climbing ability | |
| Suspension (Type) | Christie independent type1 |
| Wheels each side | |
| Return rollers each side | |
| Tracks (Type) | |
| Length | |
| Width | Tire: 2 x 3.95"1 Track: 10.25"1 |
| Diameter | 32.5"1 |
| Number of links | |
| Pitch | |
| Tire tread | |
| Track centers/tread | 6.33'1 |
| Production |
Sources:
- Profile AFV Weapons 37 Russian BT Series, John F. Milsom, 1971
- The Illustrated Guide to Tanks of the World, George Forty, 2006
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