# HMS L12

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HMS L12 and H28 History United Kingdom Name HMS L12 Builder Vickers Limited, Barrow-in-Furness Laid down 22 January 1917 Launched 16 March 1918 Commissioned 30 June 1918 Fate Sold for scrapping, 16 February 1932 General characteristics Class & type L-class submarine Displacement 914 long tons (929 t) surfaced 1,089 long tons (1,106 t) submerged Length 238 ft 7 in (72.7 m) Beam 23 ft 6 in (7.2 m) Draught 13 ft 3 in (4.0 m) Installed power 2,400 bhp (1,800 kW) (diesel) 1,600 hp (1,200 kW) (electric) Propulsion 2 × diesel engines 2 × electric motors Speed 17 knots (31 km/h; 20 mph) surfaced 10.5 knots (19.4 km/h; 12.1 mph) submerged Range 3,800 nmi (7,000 km; 4,400 mi) at 10 knots (19 km/h; 12 mph) on the surface Test depth 150 feet (45.7 m) Complement 38 Armament 4 × bow 21 in (533 mm) torpedo tubes 2 × beam 18 in (457 mm) torpedo tubes 1 × 4-inch deck gun 16 mines

**HMS *L12*** was a [L-class submarine](/source/British_L_class_submarine) built for the Royal Navy during World War I. She was one of five boats in the [class](/source/Ship_class) to be fitted as a [minelayer](/source/Minelayer). The boat survived the war and was sold for [scrap](/source/Ship_breaking) in 1932.

## Design and description

*L9* and its successors were enlarged to accommodate [21-inch (53.3 cm)](/source/British_21_inch_torpedo) torpedoes and more fuel. The submarine had a length of 238 feet 7 inches (72.7 m) [overall](/source/Length_overall), a [beam](/source/Beam_(nautical)) of 23 feet 6 inches (7.2 m) and a mean [draft](/source/Draft_(ship)) of 13 feet 3 inches (4.0 m).[1] They [displaced](/source/Displacement_(ship)) 914 long tons (929 t) on the surface and 1,089 long tons (1,106 t) submerged. The L-class submarines had a crew of 38 officers and [ratings](/source/Naval_rating).[2]

For surface running, the boats were powered by two 12-cylinder [Vickers](/source/Vickers)[3] 1,200-[brake-horsepower](/source/Horsepower#Brake_horsepower) (895 kW) [diesel engines](/source/Diesel_engine), each driving one [propeller shaft](/source/Propeller_shaft). When submerged each propeller was driven by a 600-horsepower (447 kW) [electric motor](/source/Electric_motor).[1] They could reach 17 [knots](/source/Knot_(unit)) (31 km/h; 20 mph) on the surface and 10.5 knots (19.4 km/h; 12.1 mph) underwater. On the surface, the L class had a range of 3,800 [nautical miles](/source/Nautical_mile) (7,000 km; 4,400 mi) at 10 knots (19 km/h; 12 mph).[4]

The boats were armed with four 21-inch [torpedo tubes](/source/Torpedo_tube) in the bow and two [18-inch (45 cm)](/source/British_18_inch_torpedo) in broadside mounts. They carried four reload torpedoes for the 21-inch tubes for a grand total of ten torpedoes of all sizes.[5] They were also armed with a 4-inch (102 mm) [deck gun](/source/Deck_gun).[2] *L12* was fitted with 16 vertical mine chutes in her [saddle tanks](/source/Saddle_tank_(submarine)) and carried one [mine](/source/Naval_mine) per chute.[1]

## Construction and career

HMS *L12* was built by [Vickers](/source/Vickers), [Barrow-in-Furness](/source/Barrow-in-Furness). She was laid down on 22 January 1917 and was commissioned on 30 June 1918. The boat collided with the submarine [HMS *H47*](/source/HMS_H47) off [Milford Haven](/source/Milford_Haven), [Wales](/source/Wales) on 9 July 1929. She was able to surface and returned to [Milford Haven](/source/Milford_Haven); three sailors died. HMS *L12* was sold to [John Cashmore Ltd](/source/John_Cashmore_Ltd) on 16 February 1932 for scrapping at [Newport](/source/Newport%2C_Wales).

## Notes

1. ^ [***a***](#cite_ref-gg9_1-0) [***b***](#cite_ref-gg9_1-1) [***c***](#cite_ref-gg9_1-2) Gardiner & Gray, p. 93

1. ^ [***a***](#cite_ref-a5_2-0) [***b***](#cite_ref-a5_2-1) Akermann, p. 165

1. **[^](#cite_ref-3)** Harrison, Chapter 25

1. **[^](#cite_ref-4)** Harrison, Chapters 3

1. **[^](#cite_ref-5)** Harrison, Chapter 27

## References

- Akermann, Paul (2002). *Encyclopaedia of British Submarines 1901–1955* (reprint of the 1989 ed.). Penzance, Cornwall: Periscope Publishing. [ISBN](/source/ISBN_(identifier)) [1-904381-05-7](https://en.wikipedia.org/wiki/Special:BookSources/1-904381-05-7).

- [Colledge, J. J.](/source/J._J._Colledge); Warlow, Ben (2006) [1969]. [*Ships of the Royal Navy: The Complete Record of All Fighting Ships of the Royal Navy from the 15th Century to the Present*](/source/Ships_of_the_Royal_Navy) (3rd Rev ed.). London: Chatham Publishing. [ISBN](/source/ISBN_(identifier)) [978-1-86176-281-8](https://en.wikipedia.org/wiki/Special:BookSources/978-1-86176-281-8). [OCLC](/source/OCLC_(identifier)) [67375475](https://search.worldcat.org/oclc/67375475).

- Gardiner, Robert & Gray, Randal, eds. (1985). *Conway's All the World's Fighting Ships 1906–1921*. Annapolis, Maryland: Naval Institute Press. [ISBN](/source/ISBN_(identifier)) [0-85177-245-5](https://en.wikipedia.org/wiki/Special:BookSources/0-85177-245-5).

- Harrison, A. N. (January 1979). ["The Development of HM Submarines From Holland No. 1 (1901) to Porpoise (1930) (BR3043)"](http://rnsubs.co.uk/dits-bits/br-3043.html). RN Subs. Retrieved 27 September 2022.

v t e British L-class submarines Royal Navy L1 class L1 L2 L3 L4 L5 L6 L7 L8 L9 class L9 L10 L11 L12 L14 L15 L16 L17 L18 L19 L20 L21 L22 L23 L24 L25 L26 L27 L28N L29N L30N L31N L32N L33 L34X L35X L50 class L50X L51X L52 L53 L54 L55 L56 L57X L58X L59X L60X L61X L62X L63X L64X L65X L66X L67X L68X L69 L70X L71 L72X L73X L74X Soviet Navy Bezbozhnik (ex-L55) Preceded by: J class Followed by: M class N Not completed X Cancelled List of submarines of the Royal Navy List of submarine classes of the Royal Navy

v t e Shipwrecks and maritime incidents in 1929 Shipwrecks 2 Jan: Malakoff 16 Jan: Hsin Wah 12 Feb: Alloway 19 Feb: Kanowna 22 Mar: I'm Alone 25 Mar: Muggia 29 Mar: Selje 26 May: Aleutian 9 Jul: HMS H47 17 Jul: USS General Alava 1 Aug: Asakaze 30 Aug: San Juan 7 Sep: Kuru 9 Sep: Andaste 11 Sep: Acielle 2 Oct: Commandant Bultinck 22 Oct: Milwaukee 29 Oct: Wisconsin 31 Oct: Senator 4 Nov: Gilbert San 29 Nov: Norwich City 7 Dec: Ägir 18 Dec: Fort Victoria Unknown date: San Antonio Other incidents 5 Jan: Siboney 20 Jan: President Garfield 29 Jan: City of Cairo 28 Feb: Liberty Glo 7 Mar: Thétis 10 Mar: Pengreep 22 Mar: USCGC Dexter 25 Mar: Germaine L D 26 Mar: Europa 28 Mar: Libia 30 Mar: Naïade 6 Apr USS Childs 7 Apr Paris 18 Apr Paris 27 Apr: Duchess of Richmond April (unknown date) Franconia 15 May: Irwell May (unknown date): Duke of Lancaster, Duke of Rothesay 9 Jul: HMS L12 11 Jul: I-55, Kinugasa 3 Aug: Medway Queen 9 Aug: Viceroy of India 20 Aug Paris September (unknown date): Binnendijk, Eider 5 Oct: NRP Adamastor 12 Oct: USFS Widgeon 13 Oct: Empress of Canada 19 Oct: Bowes Castle 20 Oct: USAT Liberty 6 Nov: Barbana G 13 Nov: Ro-63 22 Nov: Parizhskaya Kommuna 7 Dec: Aba 18 Dec: Algonquin 24 Dec: Roosevelt 1928 1930

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