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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. Armor was reduced to make tank faster as a common complaint from the front was that the KV-1 wasn't manoueverable.

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

Improvements

Transmission, cooling, and lubrication systems were improved.

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

Production

  • KV-1 S: 1,233, 1,370
    • Production: Autumn 1942 - 1943, August 1942 - late 1943
      • 1940: 334
      • 1941: 1,232
      • 1942: 130, 780
      • 1943: 452

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.

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.

Specifications

  KV-1 S, KV-1-S
Crew 5
Physical Characteristics  
Weight 93,670 lb,
42.5 tons
Length 22.1', 22' 3", 23' 9.5"
6.75 m, 6.95 m
Height 8' 6", 9.8', 10' 6.25"
2.64 m, 2.75 m
Width 10.7', 10' 7", 11' 6.25"
3.25 m
Width over tracks  
Ground clearance 1' 5",
0.45 m
Ground contact length 13.8'
Ground pressure 0.74 kg/cm2
Turret ring diameter  
Armament  
Main 76.2 mm M1940 L/41.5
76.2 mm 1942 F-34
76.2 mm L/41
Secondary  
MG 3: MG
4: MG
MG - coaxial 1: 7.62 mm DT MG
MG - rear 1: 7.62 mm DT MG
MG - hull 1: 7.62 mm DT MG
Side arms  
Quantity  
Main 100, 102, 114
Secondary  
MG 3,024, 3,042, 3,087
Side arms  
Armor Thickness (mm) 60
Hull Front, Upper 75, 75+30, 40-75
1943: 75
Hull Front, Lower 75+30
Hull Sides, Upper 75, 60
1943: 60
Hull Sides, Lower 75
Hull Rear 75, 40-75
1943: 40-75
Hull Top 30-40, 35, 40
1943: 30
Hull Bottom 30-40, 35
1943: 30
Turret Front 30 - 82, 90-95, 82
1943: 82
Turret Sides 100, 82
1943: 82
Turret Rear 95, 82
1943: 82
Turret Top 30
1943: 30
Engine (Make / Model) W-2, W-2-K, V-2K-s
Bore / stroke 4 stroke
Cooling  
Cylinders 12, V-12
Capacity  
Net HP 600, 600@2,000 rpm
Power to weight ratio 14.2 hp/ton
Compression ratio  
Transmission (Type) 2x4 forward, 1 reverse
Steering  
Steering ratio  
Starter  
Electrical system  
Ignition  
Fuel (Type) Diesel
Octane  
Quantity 615 liters
Road consumption  
Cross country consumption  
Performance  
Traverse 360°
Speed - Road 25 mph, 27 mph
38 kph, 42-43 kph
Speed - Cross Country 15.5 mph
Range - Road 155.3 miles, 156 miles
200 km, 330 km
1943: 250 km, 155 miles
Range - Cross Country 99 miles, 110 miles
160 km
Turning radius 31'
9.5 m
Elevation limits  
Fording depth 5' 3",
1.6 m
Trench crossing 2.8 m
Vertical obstacle 1.2 m
Climbing ability 36°
Suspension (Type) Torsion bar
Wheels each side 6
Return rollers each side  
Tracks (Type)  
Length  
Width 2' 4"
700 mm
Diameter  
Number of links  
Pitch  
Tire tread Steel
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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