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Soviet Union's JSU-122 self propelled gun
ISU-122 self propelled gun
Samokhodnaya Ustanovka (self propelled mounting)

Photos

ISU-122 self propelled gun:
Soviet Union's ISU-122 self propelled gun
Aberdeen Tank Museum

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

Specifications

  ISU-122,
JSU-122
Crew 51,3,4,6
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
Length w/gun 32' 1.8"4, 32' 10", 33' 5"6
9.8 m4, 9.85 m1
Length w/o gun 22' 3.9"4, 22' 4"1,3
6.8 m1,3, 6.805 m4
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
Width 10'1,6, 10' 1"3, 10' 2.5", 11' 8.2"4
3.07 m1,3, 3.56 m4
Width over tracks  
Ground clearance 18"6
Ground contact length 169"6
Ground pressure 11.6 psi6
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
Secondary  
MG 12.7 mm MG4
12.7 mm DShK-38 MG, AA6
Side arms  
Quantity  
Main 305, 406
Secondary  
MG 4506
Side arms  
Armor Thickness (mm) 1203
Front: 3.54"1
Front: 901
Hull Front, Upper 3"@0°6, 901
Hull Front, Lower  
Hull Sides, Upper 1.77"@0°6, 901
Hull Sides, Lower  
Hull Rear 1.77"@0°6, 601
Hull Top 301
Hull Bottom 301
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
Road consumption 1.3 mpg6
Cross country consumption  
Performance  
Traverse 10° each way5
Speed - Road 23 mph1,3,4,6
37 kph1,3,4
Speed - Cross Country  
Range - Road 112 miles4, 137 miles1, 138 miles, 149 miles3, 150 miles1,6
180 km4, 220 km1, 240 km1,3
Range - Cross Country 50 miles1
80 km1
Turning radius  
Elevation limits  
Fording depth 4' 3"6, 4' 3.2"4
1.3 m4
Trench crossing 8' 2"6
Vertical obstacle 3' 3"6
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
  ISU-122-2,
ISU-122 1944
Crew 52
Physical Characteristics  
Weight 45.5-46 tons2
Length w/gun 9.059-9.18 m2
Length w/o gun 6.77 m2
Height 2.48 m2
Width 3.07 m2
Width over tracks  
Ground clearance 0.4-0.47 m2
Ground contact length  
Ground pressure 0.81 kg/cm2 2
Armament  
Main 122 mm 1943 D-25 S2
Secondary  
MG 12.7 mm DSchK 38/43 AA2
Side arms  
Quantity  
Main 20-302
Secondary  
MG 2502
Side arms  
Armor Thickness (mm)  
Hull Front, Upper 75-902
Hull Front, Lower 60-902
Hull Sides, Upper 602
Hull Sides, Lower 902
Hull Rear 602
Hull Top 20-302
Hull Bottom 20-302
Superstructure Front  
Superstructure Sides  
Superstructure Rear  
Superstructure Top  
Engine (Make / Model) W-2-IS2
Bore / stroke 4 stroke2
Cooling  
Cylinders V-122
Capacity  
Net HP 600@2,000 rpm2
Power to weight ratio 10.9 hp/ton2
Compression ratio  
Transmission (Type)  
Steering  
Steering ratio  
Starter  
Electrical system  
Ignition  
Fuel (Type) Diesel2
Octane  
Quantity 520-560 liters2
Road consumption  
Cross country consumption  
Performance  
Traverse  
Speed - Road 37 kph2
Speed - Cross Country  
Range - Road 1944: 220 km2
Range - Cross Country  
Turning radius  
Elevation limits  
Fording depth 1.3-1.5 m2
Trench crossing 2.5-2.7 m2
Vertical obstacle 1-1.2 m2
Climbing ability 36°2
Suspension (Type)  
Wheels each side  
Return rollers each side  
Tracks (Type)  
Length  
Width  
Diameter  
Number of links  
Pitch  
Tire tread  
Track centers/tread  

Sources:

  1. Russian Tanks of World War II Stalin's Armored Might, by Tim Bean & Will Fowler, 2002
  2. Russian Tanks and Armored Vehicles 1917-1945, by Wolfgang Fleischer, 1999
  3. 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
  4. The Encyclopedia of Weapons of World War II, Chris Bishop, 1998
  5. Removed
  6. Tank Data 2, Aberdeen Proving Grounds Series, E. J. Hoffschmidt and W. H. Tantum IV, 1969
20th Century American Military History Crucial Site