NAVYPEDIA

Photo

 

Ships

Name	No	Yard No	Builder	Laid down	Launched	Comp	Fate
Л-20 [L-20], 6.1949- Б-20 [B-20]		302	189 Yd (Ordzhonikidze Yd), Leningrad // 402 Yd, Molotovsk	6.1938	14.4.1940	8.1942	test ship 2.1956, stricken 3.1958
Л-21 [L-21], 6.1949- Б-21 [B-21]		303	189 Yd (Ordzhonikidze Yd), Leningrad	6.1938	14.7.1940	8.1943	stricken 12.1955
Л-22 [L-22], 6.1949- Б-22 [B-22]		304	189 Yd (Ordzhonikidze Yd), Leningrad // 402 Yd, Molotovsk	12.1938	23.9.1939	8.1942	test ship 2.1956, stricken 5.1959
Л-23 [L-23]		353	198 Yd (Marti Yd), Nikolayev // Poti port wks	10.1938	29.4.1940	10.1941	sunk 17.1.1944
Л-24 [L-24]		354	198 Yd (Marti Yd), Nikolayev // Poti port wks	10.1938	17.12.1940	4.1942	sunk 17.12.1942
Л-25 [L-25]		355	198 Yd (Marti Yd), Nikolayev	10.1938	26.2.1941	---	foundered incomplete 18.12.1944

Technical data

Displacement standard, t
Displacement normal, t	1108 / 1400
Length, m	85.3
Breadth, m	7.00
Draught, m	4.05
No of shafts	2
Machinery	2 1D diesels / 2 PG-9 electric motors
Power, h. p.	4000 / 1300
Max speed, kts	18 / 9
Fuel, t	diesel oil 143
Endurance, nm(kts)	10000(10) / 150(2.5)
Armament	1 x 1 - 100/49 B-24, 1 x 1 - 45/43 21K, 8 - 533 TT (6 bow, 2 ext aft, 18), 20 mines
Electronic equipment	Mars-16 hydrophone
Complement	56
Diving depth operational, m	80

Standard scale images

Graphics

Project history

Submarines of "combined" type storing powerful torpedo armament at possibility to laid mines. In construction experience of building of D class submarines was used, and also decisions borrowed from raised British subarine L55. Saddle-tank hull. Mines were carried in two horizontal watertight tubes and laid astern.     Submarines of II series were built for Baltic and Black Seas. In 1934 for Pacific Fleet there was begun building of XI series, in which construction a number of changes was brought. These submarines were laid down on European shipyards, then taken apart and transported by railways for completion to the Far East. By experience of their building XIII series submarines were built. Their construction was simplified for convenience of transportation and acceleration of outfitting works. Besides, for XIII series the new hull was developed on the basis of IX series submarine drawings (diameter of a pressure hull was moderated from 4.85 to 4.6m), and also 2 TT were installed aft out of a pressure hull, that has entailed reduction of mines stowage from 20 to 18. Series XIII-38 differed from previous by new diesels and a number of other details, mines stowage was again increased to 20. Maximal diving depth for II and XI series was 90 m; for subsequent 100m.

L-25 was never completed; 20.12.1944 she foundered during a storm during inter-base passage.

Modernizations

1943, L-20, L-22; 1944, L-21: + type 129 sonar

Naval service

L-23 was lost between 15 and 29.1.1944 off Cape Tarhankut, probably on a mine. L-24 was lost between 12 and 31.12.1942 on a mine off Cape Kaliakra.