Soviet K-class submarine
| Class overview | |
|---|---|
| Operators: |
 Soviet Navy
|
| In service: | 1939 - 1959 |
| In commission: | 1940 - 1959 |
| Completed: | 12 |
| Lost: | 5 |
| Retired: | 7 |
| General characteristics | |
| Displacement: |
|
| Length: | 97.65 m |
| Beam: | 7.4 |
| Draught: | 4.51 |
| Propulsion: | 2-shaft diesel electric, 8400-hp diesel, 2400-hp electric |
| Speed: |
|
| Range: | 14,000 nm at 11 knots |
| Test depth: | 230 ft (70 m) max. 100 m |
| Complement: | 67 (10 officers) |
| Armament: |
|
The K class were the largest submarines built for the Soviet Navy in the World War II era.
The design was approved in 1936 as a long range "cruiser submarine" with a heavy torpedo and gun armament. The boats could operate as "fleet submarine" working with the battle fleet or as long range commerce raiders
They were a significantly improved version of the Pravda class and overcame most of their shortcomings (Conway's Fighting Ships). The double hull was divided into seven compartments. It was originally planned to carry a small floatplane for scouting but this concept was abandoned when the planned aircraft proved too flimsy.
Yakubov and Worth state that these were the most successful Soviet submarines of the World War II era, with high speed and good seakeeping. The hull provided spacious accommodation and diving time was 60 seconds. American naval constructors inspected K-21 in 1944 and thought the design to be workmanlike but technically inferior to contemporary American boats such as the Gato class submarines
An improved design the KU class which was to be of welded construction was in planning in 1941. A total of 24 KU boats were planned but none were started.
All ships were built by Marti Yard / Ordzhinikidze Yard, Leningrad
A total of twelve boats were built in the Baltic for the Soviet Northern Fleet. K1 to K23 were transferred prior to the German Invasion. K51 to K56 were trapped in Leningrad during the Blockade and were completed after the war and transferred to the Arctic
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