JSU-122 Self Propelled Gun6:
ISU-122 Self Propelled Gun:
Samokhodnaya Ustanovka (self propelled mounting)
Aberdeen Tank Museum
Kotin's design bureau at Uralmash works in Chelyabinsk designed a self-propelled gun on the IS chassis.
Prototypes with the 122 mm gun were designated the ISU-249. The first vehicles had the 122 mm 1931/43 A-19 L/46.3 gun.
55 lb shell to 13,000 meters. Ammunition was in 2 pieces and the rade of fire was 2-3 per minute.
Late models had 122 mm D-25S L/43 gun. Had larger muzzle brake6 and better armor penetration. The A-19S did not have a muzzle brake.6
The 122 mm gun fired a HE shell at a muzzle velocity of 2,620'/sec.6
| ISU-122, JSU-122 | ISU-122 1944 | |
|---|---|---|
| Crew | 51,3,4,6 | 52 |
| Physical Characteristics | ||
| Weight | 101,920 lb, 102,361 lb4 41.1 tons3, 45.5 tons1,5, 46 tons6, 50.7 tons1 41,800 kg3, 46,000 kg1, 46,340 kg4 |
45.5-46 tons2 |
| Length w/gun | 32' 1.8"4, 32' 10", 33' 5"6 9.8 m4, 9.85 m1,5 |
9.059-9.18 m2 |
| Length w/o gun | 22' 3.9"4, 22' 4"1,3 6.8 m1,3, 6.805 m4 |
6.77 m2 |
| Height | 8' 1"1,3, 8' 2"6, 8' 3.2"4, 8' 3.5", 2.46 m1,3, 2.48 m1,5, 2.52 m4 |
2.48 m2 |
| Width | 10'1,6, 10' 1"3, 10' 2.5", 11' 8.2"4 3.07 m1,3,5, 3.56 m4 |
3.07 m2 |
| Width over tracks | ||
| Ground clearance | 18"6 | 0.4-0.47 m2 |
| Ground contact length | 169"6 | |
| Ground pressure | 11.6 psi6 | 0.81 kg/(cm2)2 |
| Turret ring diameter | ||
| Armament | ||
| Main | 122 mm M-1944 L/45 A-10 122 mm A-19S1 122 mm1,4 122 mm Model 1938 howitzer3 122 mm A-195 122 mm D-25S (later models)5 122 mm D25S or A-19S6 |
122 mm 1943 D-25 S2 |
| Secondary | ||
| MG | 12.7 mm MG4 12.7 mm DShK, AA5 12.7 mm DShK-38 MG, AA6 |
12.7 mm DSchK 38/43 AA2 |
| Side arms | ||
| Quantity | ||
| Main | 305, 406 | 20-302 |
| Secondary | ||
| MG | 4506 | 2502 |
| Side arms | ||
| Armor Thickness (mm) | 1203 Front: 905 Side: 905 |
|
| Hull Front, Upper | 3"@0°6, 901 | 75-902 |
| Hull Front, Lower | 60-902 | |
| Hull Sides, Upper | 1.77"@0°6, 901 | 602 |
| Hull Sides, Lower | 902 | |
| Hull Rear | 1.77"@0°6, 601 | 602 |
| Hull Top | 301 | 20-302 |
| Hull Bottom | 301 | 20-302 |
| Superstructure Front | Mantle: 7.75"@0°6 | |
| Superstructure Sides | ||
| Superstructure Rear | ||
| Superstructure Top | ||
| Engine (Make / Model) | W-2-IS, V-21,2,3 Model W-26 |
|
| Bore / stroke | ||
| Cooling | Water6 | |
| Cylinders | V-124,6 | |
| Capacity | ||
| Net HP | 5204,6, 6005 | |
| Power to weight ratio | ||
| Compression ratio | ||
| Transmission (Type) | Dual range epicycle6 8 forward, 2 reverse6 |
|
| Steering | Clutch brake6 | |
| Steering ratio | ||
| Starter | ||
| Electrical system | ||
| Ignition | ||
| Fuel (Type) | Diesel6 | |
| Octane | ||
| Quantity | 110 gallons6, 189 gallons1 860 liters1 |
520-560 liters2 |
| Road consumption | 1.3 mpg6 | |
| Cross country consumption | ||
| Performance | ||
| Traverse | 10° each way5 | |
| Max speed | 23 mph1,3,4,6 37 kph1,3,4,5 |
37 kph2 |
| Cross country speed | ||
| Road radius | 112 miles4, 137 miles1, 138 miles, 149 miles3, 150 miles1,6 180 km4, 220 km1, 240 km1,3 |
1944: 220 km2 |
| Cross country radius | 50 miles1 80 km1 |
|
| Turning radius | ||
| Elevation limits | -5° to 20°5 | |
| Fording depth | 4' 3"6, 4' 3.2"4 1.3 m4 |
1.3-1.5 m2 |
| Trench crossing | 8' 2"6 | 2.5-2.7 m2 |
| Vertical obstacle | 3' 3"6 | 1-1.2 m2 |
| Climbing ability | 36° slope6 | |
| Suspension (Type) | Christie type coil spring torsion bar6 | |
| Wheels each side | 66 | |
| Return rollers each side | 36 | |
| Tracks (Type) | Steel skeleton, dry pin6 | |
| Length | ||
| Width | 27.5"6 | |
| Diameter | ||
| Number of links | 87-906 | |
| Pitch | 6.25"6 | |
| Tire tread | ||
| Track centers/tread | 86"6 | |
| Production | ~2,500 1944: Soviet arsenals6 |
|
|
|
|---|---|
|
|
|
| 1943 |
351,2 |
| 1944 |
2,5101,2 |
| 1945 |
1,5301,2 |
| Total |
4,0751,2 |
Sources:
- Russian Tanks of World War II Stalin's Armored Might, by Tim Bean & Will Fowler, 2002
- Russian Tanks and Armored Vehicles 1917-1945, by Wolfgang Fleischer, 1999
- The Encyclopedia of Tanks and Armored Fighting Vehicles - The Comprehensive Guide to Over 900 Armored Fighting Vehicles From 1915 to the Present Day, General Editor: Christopher F. Foss, 2002
- The Encyclopedia of Weapons of World War II, Chris Bishop, 1998
- Jane's World War II Tanks and Fighting Vehicles The Complete Guide, Leland Ness, 2002
- Tank Data 2, Aberdeen Proving Grounds Series, E. J. Hoffschmidt and W. H. Tantum IV, 1969
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