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Soviet Union's T-100 "Sotka" heavy tank


The T-100 was to meet the requirements that were put forth by the Directorate of Armed Forces (ABTU) in November 1937. These requirements called for a tank that could withstand shots from a 76.2 mm gun from 3,937' / 1,200 m. It was also to be powered by a diesel engine as it was felt petrol resulted in too large of fires when hit. The requirements also called for a tank with five turrets.

The T-100 was designed by a team led by N. Barykov at the Bolshevik Factory's Experimental Design Mechanical Section (OKMO), in Leningrad.

The turret had a 76.2 mm gun and the front turret a 45 mm gun which was nearly the same layout as the SMK.


On May 4, 1938 the designs for the SMK and T-100 were presented to a joint committee from the Politburo and Defense Council. Both were approved to build prototypes.

The T-100's prototype was finished in May 1939. It was sent to the Kubinka testing grounds outside of Moscow. The T-100 prototype was tested alongside the SMK and KV-1 prototypes.


Very few T-100s were built.


  • T-100:
  • T-100U: Mounted a 130 mm B-13 naval gun in hull.


Russo-Finnish War

The T-100 was used against Finland in the Winter War.

The T-100, SMK, and KV-1 prototypes were apart of the 91st Tank Battalion of the 20th Heavy Tank Brigade and had their first combat near Summa from December 17 to 19.

On December 19 the SMK and T-100 were joined by five T-28s and Red Army infantry. The SMK was immobilized by a mine which blew off one if its tracks. It was then found that during the repairs, under fire from the Finns, that the engine wouldn't restart. The T-100 was hooked up to it to try and tow it out of fire. But this was difficult in the icy conditions. The SMK was eventually abandoned when the covering forces started to run low on ammunition. The SMK wasn't recovered until February 1940 when the Red Army broke through the Mannerheim Line.


Crew 6, 6 or 7, 7
Physical Characteristics  
Weight 56 tons, 57 tons, 58 tons
58,000 kg
Length 24' 3", 29.3'
7.4 m
Height 10' 6", 10.7'
3.2 m
Width 9.75', 10' 6"
3.2 m
Ground clearance  
Ground contact length  
Ground pressure  
Turret ring diameter  
Main 75 mm L-11
76.2 mm
Secondary 45 mm
MG 3: MGs
Side arms  
Side arms  
Armor Thickness (mm) 20 - 70
30 - 60
Hull Front, Upper  
Hull Front, Lower  
Hull Sides, Upper  
Hull Sides, Lower  
Hull Rear  
Hull Top  
Hull Bottom  
Turret Front  
Turret Sides  
Turret Rear  
Turret Top  
Engine (Make / Model) M-17M
Cylinders 12
Net HP 400 @ 2,000 rpm
Fuel type Gasoline
Traverse - main turret 360°
Traverse - front turret 180°
Speed - Road 18.7 mph, 21.7 mph
35 kph
Speed - Cross Country  
Range - Road  
Turning Radius  
Elevation Limits  
Fording depth  
Trench crossing  
Vertical Obstacle  
Suspension (Type) Torsion bar
Wheels each side  
Return rollers each side  
Track length  
Track width  
Track centers/tread  


  1. 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
  2. Tanks of the World, 1915-1945, Peter Chamberlain, Chris Ellis, 1972
  3. Tanks of World War II, Duncan Crow, 1979
  4. Airfix Magazine Guide 22 Russian Tanks of World War 2, John Milsom and Steve Zaloga, 1977
  5. Russian Tanks and Armored Vehicles 1917-1945, by Wolfgang Fleischer, 1999
  6. Russian Tanks of World War II Stalin's Armored Might, by Tim Bean & Will Fowler, 2002
20th Century American Military History Crucial Site