| GENERAL
DATA |
| Other Designations |
IS-1 [IS - Iosef
Stalin, also IS-85, and JS-1] |
| Manufacturer(s) |
Factory No.100
Kirovskiy Works in Chelyabinsk (ChKZ or Tankograd) |
| Production Quantity |
1071 |
Production Period |
Late 1943 - Early 1944 |
| Type |
Heavy Tank |
Crew |
4 |
| Overall Length |
8.3 m (27' 3") |
Barrel Overhang |
1.6 m (5' 3") |
| Width |
3.1 m (10' 2") |
Height |
2.7 m (8' 10") |
| Combat Weight |
44000 kg (97000 lbs) |
Radio Equipment |
10R or 10RK |
| FIREPOWER |
| Primary Armament |
85mm Gun D-5T85 |
Ammunition Carried |
59 |
| Traverse (degrees) |
360° |
Elevation (degrees) |
-4° to +23° |
| Traverse speed (360°) |
n.a. |
Sight |
10T-15, PT-4-15 |
| Secondary Armament |
3 x 7.62mm DT MG
(coaxial, turret rear, bow) |
Ammunition Carried |
2520 |
| MOBILITY
CHARACTERISTICS |
| Engine Make & Model |
V-2-IS (V-2K) |
Track Links |
87-90/track |
| Type & Displacement |
V12, 38.9 liters |
Track Width |
65 cm (26") |
| Horsepower (max.) |
600hp@2000rpm |
Track Ground Contact |
436 cm (172") |
| Power/Weight Ratio |
13.6 hp/tonne |
Ground Pressure |
0.78 kg/cm2 (11.1
psi) |
| Gearbox |
4 forward, 1 reverse |
Ground Clearance |
0.46 m (1' 6") |
| Fuel |
Diesel |
Turning Radius |
0 |
| Range on road |
150(260) km |
Gradient |
36° |
| Mileage on road |
330 l/100km |
Vertical Obstacle |
1.0 m (3' 3") |
| Fuel Capacity |
520 (+ 360
external)2 l |
Fording |
1.3 m (4' 3") |
| Speed on/off road |
37/19 km/h |
Trench Crossing |
2.5 m (8' 2") |
| ARMOR
PROTECTION |
| Armor Detail |
Front |
Side |
Rear |
Top/Bottom |
| Hull |
100mm@60° |
90mm@90° |
60mm@49° |
30mm@0°(front) |
| 60mm@18°(glacis) |
20mm@0°(back) |
| Superstructure |
120mm@60°(driver) |
90mm@75° |
60mm@41° |
30mm@0° |
| Turret |
100mm@round |
100mm@72° |
100mm@60° |
30mm@0-5° |
| Mantlet |
100mm@round |
- |
- |
- |
| NOTES |
1At least 102 of these vehicles were later
rearmed with the 122mm D-25 gun. It is unclear whether any of the vehicles with the
original configuration were actually used in combat.
2It is assumed here that the four 90 liter
tanks were all used for fuel. |
| REFERENCES |
| RT, RTAV, OOBTr, TW, IS2, PH28r, IS2,
Russian Military Zone |
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