Soviet submarine L-3

The Soviet Navy decided in the early 1920s that it wanted both patrol and minelaying submarines, with the latter derived from the former. Construction of the minelayers was postponed until the submarine design bureaus had time to learn the lessons from building the Dekabrist-class patrol submarines and the British submarine {{HMS|L55}} which had been salvaged in 1928. The boats displaced {{convert|1070|t|LT|sp=us|lk=on}} surfaced and {{cvt|1140|t|LT}} submerged. They had an overall length of {{convert|79.93|m|ft|sp=us|0}}, a beam of {{convert|7.3|m|ftin|sp=us}}, and a mean draft of {{convert|4.3|m|ft|0|sp=us}}. The boats had a diving depth of {{cvt|75|m}}. Their crew numbered 53 officers and crewmen.Budzbon, Radziemski & Twardowski, p. 145

For surface running, the Leninets-class boats were powered by a pair of 42-BM-6 diesel engines, one per propeller shaft. The engines produced a total of {{convert|2200|PS|kW|lk=on|0|sp=us}}, enough to give them a speed of {{convert|14|kn|lk=in}}. When submerged each shaft was driven by a PG 84 {{convert|650|PS|kW|0|adj=on|sp=us}} electric motor for {{convert|10|kn}}. The boats had a surface endurance of {{convert|6000|nmi|lk=in}} at {{convert|10|kn}} and {{cvt|135|nmi}} at {{convert|2.5|kn}} submerged. For submerged cruising the Leninets class were equipped with a pair of {{cvt|30|PS|kW}} electric motors. As completed the boats had problems with stability, excessive diving times (up to three minutes), noisy auxiliary machinery, and poor-quality batteries. These produced excessive amounts of explosive hydrogen gas which could lead to fires. By the end of 1934 the battery compartments had been rendered gas-tight and the ventilation had been improved.

They were armed with six {{convert|533|mm|in|0|adj=on|sp=us}} torpedo tubes in the bow, each with one reload. A pair of horizontal tubes for a total of 20 PLT-10 mines ran inside the pressure hull to the extreme stern where they would be ejected after the tubes had been flooded. The mines could be laid down to a depth of {{cvt|150|m}} while the boats cruised at a speed of {{convert|8|kn}} and depths of {{cvt|4|-|12|m}}. They were also initially equipped with a {{convert|100|mm|adj=on|sp=us}} B-2 deck gun mounted on the front of the conning tower, although this was replaced by a B-34 gun of the same size and moved to a position forward of the conning tower. At some point during the 1930s, a 45 mm anti-aircraft gun (21-K) anti-aircraft (AA) gun was added on the rear of the conning tower.Polmar & Noot, p. 250Budzbon, Radziemski & Twardowski, pp. 145–146

L-3 was laid down on 6 September 1929 by the Baltic Works in Leningrad with the name Bolshevik and was launched on 8 July 1931. She was renamed Frunzovets on 21 November and completed on 5 November 1933. The ship was commissioned into the Baltic Fleet four days later and renamed L-3 on 15 September 1934.

After the dismantling of the submarine, part of it was used as the monument in Liepāja, though the monument was relocated to Moscow in 1994.Budzbon, Radziemski & Twardowski, p. 146

{{reflist}}

• {{cite book |last1=Budzbon |first1=Przemysław |last2=Radziemski |first2=Jan |last3=Twardowski |first3=Marek |title=Warships of the Soviet Fleets 1939–1945 |date=2022 |publisher=Naval Institute Press |location=Annapolis, Maryland |isbn=978-1-68247-877-6|volume=I: Major Combatants|name-list-style=amp}}
• {{cite book|last1=Polmar|first1=Norman|last2=Noot|first2=Jurrien|title=Submarines of the Russian and Soviet Navies, 1718–1990 |year=1991 |publisher=Naval Institute Press |location=Annapolis, Maryland |isbn=0-87021-570-1 |name-list-style=amp}}
• {{cite book|last=Rohwer|first=Jürgen|title=Chronology of the War at Sea 1939–1945: The Naval History of World War Two |publisher=Naval Institute Press|location=Annapolis, Maryland|year=2005 |edition=Third Revised |isbn=1-59114-119-2|author-link=Jürgen Rohwer}}

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Category:World War II submarines of the Soviet Union

Category:1931 ships

Category:Leninets-class submarines

Category:Museum ships in Russia