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Soviet Union's JSU-122 self propelled gun6
ISU-122 self propelled gun1
Samokhodnaya Ustanovka (self propelled mounting)
ISU-122 self propelled gun: Aberdeen Tank Museum |
ISU-122 self propelled gun: |
ISU-122 self propelled gun: |
ISU-122 self propelled gun: |
ISU-122 self propelled gun: |
ISU-122 self propelled gun, 1945: |
ISU-122A self propelled gun: |
Design
The ISU-122 was designed by a design team at Chelyabinsk, the Mechanized Artillery Bureau (BAS), and General F. Petrov.1 The ISU-122 was to be based on the IS-2's hull and chassis.1
Had larger muzzle brake6 and better armor penetration.
Main Armament
The 152 mm gun wasn't available from the factories so the team decided to put a 122 mm A-19 gun into the superstructure.1 As the A-19 and the 152 mm gun used the same carriage is was relatively easy to add it in place of the 152 mm.1
The mantlet was in two pieces and bolted onto the right side of the hull.1
| Model | Type | Weight | Muzzle Velocity | Direct Fire Range |
Indirect Fire Range |
Penetration | |
|---|---|---|---|---|---|---|---|
| 500 m | 1,000 m | ||||||
| 55 lb | 13,000 m | ||||||
| HE6 | 2,620'/sec6 | ||||||
| A-192 | AT2 | 25 kg2 | 800 m/sec2 | ||||
| D-2582 | AT2 | 25 kg2 | 781 m/sec2 | 155 mm2 | 145 mm2 | ||
The A-19S did not have a muzzle brake.6 The first vehicles had the 122 mm 1931/43 A-19 L/46.3 gun. Starting in 1944 the ISU-122 had the 122 mm D-25S gun installed.1 This was the same gun as in the IS-2.1 The gun mantlet was altered and the crew space was improved.1
Prototype
Prototypes with the 122 mm gun were designated the ISU-249 or Object 241.1
Production
The ISU-122 entered service in December 1943.1
- ISU-122: ~2,500
- Production: 19446
- Manufacturer: Soviet arsenals6
- ISU-122 and ISU-152: 4,0751,2
- 1943: 351,2
- 1944: 2,5101,2
- 1945: 1,5301,2
Variants
- ISU-249 (Project 249)2: Prototype.2 Had 122 mm 1931/43 cannon, A-19.2
- ISU-122: Had 122 mm 1931/43 L/46.3 cannon, A-19.2
- ISU-122 1943?: Had 122 mm 1943 L/43, D-258 cannon.2 Had a double acting muzzle brake.2 The gun was in a ball shaped mantlet.2
- ISU-122 BM2: Had 122 mm BL-7 L/60.2
- ISU-122 E2: Test model.2
- ISU-1302: Test model.2 Had 130 mm gun.2
Usage
The ISU-122 was used with the ISU-152 in 56 Independent Heavy Self-Propelled Artillery Regiments, which became Guard units after December 1944.1
| ISU-1221, JSU-122 | ISU-122-21, ISU-122 19442 | |
|---|---|---|
| Crew | 51,3,4,6 | 52 |
| Physical Characteristics | ||
| Weight | 101,920 lb, 102,361 lb4 41.1 tons3, 45.5 tons1, 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 |
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, 2.52 m4 |
2.48 m2 |
| Width | 10'1,6, 10' 1"3, 10' 2.5", 11' 8.2"4 3.07 m1,3, 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 D25S or A-19S6 |
122 mm 1943 D-25 S2 |
| Secondary | ||
| MG | 12.7 mm MG4 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: 3.54"1 Front: 901 |
|
| 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 |
W-2-IS2 |
| Bore / stroke | 4 stroke2 | |
| Cooling | Water6 | |
| Cylinders | V-124,6 | V-122 |
| Capacity | ||
| Net HP | 5204,6, 6005 | 600@2,000 rpm2 |
| Power to weight ratio | 10.9 hp/ton2 | |
| Compression ratio | ||
| Transmission (Type) | Dual range epicycle6 8 forward, 2 reverse6 |
|
| Steering | Clutch brake6 | |
| Steering ratio | ||
| Starter | ||
| Electrical system | ||
| Ignition | ||
| Fuel (Type) | Diesel6 | Diesel2 |
| 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 |
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 | ||
| 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 | 36°2 |
| 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 |
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
- Removed
- Tank Data 2, Aberdeen Proving Grounds Series, E. J. Hoffschmidt and W. H. Tantum IV, 1969
