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Soviet Union's KV-1 S (skorostnoy, "speed"), KV-1-S heavy tank:

Design

The KV-1 S was designed by N. F. Shashmurin.2 Armor was reduced to make tank faster as a common complaint from the front was that the KV-1 wasn't manoueverable.2

The armor was made thinner and the turret made smaller.1 A vision cupola was added to turret.2

Improvements

Transmission, cooling, and lubrication systems were improved.1,2

The KV-1-S had a new gearbox and main clutch installed.1

Production

  • KV-1 S: 1,233, 1,3701
    • Production: Autumn 1942 - 19432, August 1942 - late 19431
      • 1940: 3342
      • 1941: 1,2322
      • 1942: 1302, 7801
      • 1943: 4521,2

Usage

Kursk

The 53rd Guards and 57th Army Heavy Tank Brigades were equipped with KV-1-Ss at Kursk and took part in the heavy fighting from July 12 - 14, 1943.1

Berlin

It is not known for sure but there were reports of KV-1-Ss taking part in Berlin during the operations to take the city in April - May 1945.1

Specifications

  KV-1 S2, KV-1-S1
Crew 52,3
Physical Characteristics  
Weight 93,670 lb,
42.5 tons2,3,4,5,6
Length 22.1'3, 22' 3", 23' 9.5"
6.75 m2, 6.95 m5
Height 8' 6", 9.8'3, 10' 6.25"
2.64 m5, 2.75 m2
Width 10.7'3, 10' 7", 11' 6.25"
3.25 m2,5
Width over tracks  
Ground clearance 1' 5",
0.45 m2,5
Ground contact length 13.8'3
Ground pressure 0.74 kg/cm2 2
Turret ring diameter  
Armament  
Main 76.2 mm M1940 L/41.53
76.2 mm 1942 F-342
76.2 mm L/415
Secondary  
MG 3: MG3
4: MG5
MG - coaxial 1: 7.62 mm DT MG2
MG - rear 1: 7.62 mm DT MG2
MG - hull 1: 7.62 mm DT MG2
Side arms  
Quantity  
Main 1002, 1023, 1145
Secondary  
MG 3,0242, 3,0423, 3,0875
Side arms  
Armor Thickness (mm) 606
Hull Front, Upper 753, 75+305, 40-752
1943: 751
Hull Front, Lower 75+30
Hull Sides, Upper 755, 602,3
1943: 601
Hull Sides, Lower 75
Hull Rear 755, 40-752
1943: 40-751
Hull Top 30-402, 353, 405
1943: 301
Hull Bottom 30-402, 353
1943: 301
Turret Front 30 - 823, 90-955, 822
1943: 821
Turret Sides 1005, 822
1943: 821
Turret Rear 955, 822
1943: 821
Turret Top 305
1943: 301
Engine (Make / Model) W-25, W-2-K2, V-2K-s3
Bore / stroke 4 stroke2
Cooling  
Cylinders 123, V-122
Capacity  
Net HP 6003, 600@2,000 rpm2
Power to weight ratio 14.2 hp/ton2
Compression ratio  
Transmission (Type) 2x4 forward5, 1 reverse5
Steering  
Steering ratio  
Starter  
Electrical system  
Ignition  
Fuel (Type) Diesel3
Octane  
Quantity 615 liters2
Road consumption  
Cross country consumption  
Performance  
Traverse 360°
Speed - Road 25 mph3,6, 27 mph4
38 kph5, 42-43 kph2
Speed - Cross Country 15.5 mph
Range - Road 155.3 miles, 156 miles3
200 km5, 330 km2
1943: 250 km1, 155 miles1
Range - Cross Country 99 miles1, 110 miles3
160 km1,5
Turning radius 31'
9.5 m5
Elevation limits  
Fording depth 5' 3",
1.6 m2,5
Trench crossing 2.8 m2
Vertical obstacle 1.2 m2
Climbing ability 36°2
Suspension (Type) Torsion bar5
Wheels each side 65
Return rollers each side  
Tracks (Type)  
Length  
Width 2' 4"3
700 mm5
Diameter  
Number of links  
Pitch  
Tire tread Steel5
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. Airfix Magazine Guide 22 Russian Tanks of World War 2, John Milsom and Steve Zaloga, 1977
  4. Tanks of World War II, Duncan Crow, 1979
  5. Panzer Truppen The Complete Guide to the Creation and Combat Employment of Germany's Tank Force 1943-1945, Thomas L. Jentz, 1996
  6. Tanks of the World, 1915-1945, Peter Chamberlain, Chris Ellis, 1972
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