OnWar.com

Tanks of World War II

IS-1

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

Copyright © 2018 Ralph Zuljan