- Design and description
- Construction and career
- Notes
- References
{{Use dmy dates|date=July 2017}}{{Use British English|date=July 2017}}{{Infobox ship image| Ship image= | Ship caption=R-class submarine
}}{{Infobox ship career | Hide header= | Ship country=United Kingdom | UK|naval}} | Ship name=HMS R12 | Ship ordered= | Ship awarded= | Ship builder=Cammell Laird, Birkenhead | Ship original cost= | Ship yard number= | Ship way number= | Ship laid down=1 December 1917 | Ship launched=9 April 1918 | Ship sponsor= | Ship christened= | Ship completed= | Ship acquired= | Ship commissioned=29 October 1919 | Ship decommissioned=December 1919 | Ship in service= | Ship out of service= | Ship renamed= | Ship reclassified= | Ship refit= | Ship struck= | Ship reinstated= | Ship homeport= | Ship identification= | Ship motto= | Ship nickname= | Ship honours= | Ship captured= | Ship fate= Sold, 21 February 1923 | Ship notes= | Ship badge=
}}{{Infobox ship characteristics | Hide header= | Header caption= | Ship class=R-class submarine | Ship tonnage= | 410|LT|t|0}} surfaced- {{convert|503|LT|t|0}} submerged
| 163|ft|9|in|m|abbr=on}} | 15|ft|3|in|m|abbr=on}} | 11|ft|6|in|m|abbr=on}} | 240|bhp|kW|lk=in|abbr=on}} (diesel)- {{convert|1200|hp|kW|abbr=on}} (electric)
| Ship propulsion=*1 × diesel engine | 9.5|kn|lk=in}} surfaced- {{convert|15|kn}} submerged
| 2400|nmi|abbr=on|lk=in}} at {{convert|9|kn|}} surfaced; {{convert|60|nmi|abbr=on}} at {{convert|5|kn|}} submerged | 150|ft|1}} | Ship complement=2 officers and 20 ratings | Ship sensors=Bow hydrophone array | Ship armament=6 × bow 18-inch (45 cm) torpedo tubes | Ship notes=
}} | HMS R12 was one of 10 R-class submarine built for the Royal Navy during the First World War. The boat was not completed before the end of the war and was sold for scrap in 1923. Design and descriptionThe R-class submarine was designed to meet an Admiralty requirement for a specialised hunter-killer submarine with an emphasis on submerged performance. The boats had a length of {{convert|163|ft|9|in|m|1}} overall, a beam of {{convert|15|ft|3|in|m|1}} and a mean draft of {{convert|11|ft|6|in|m|1}}. They displaced {{convert|410|LT|t}} on the surface and {{convert|503|LT|t}} submerged. The R-class submarines had a crew of 2 officers and 20 ratings.[1] They had a diving depth of {{convert|150|ft|1}}.[2] For surface running, the boats were powered by a single eight-cylinder [3] {{convert|240|bhp|lk=in|0|adj=on}} diesel engine that drove the single propeller shaft. When submerged it was driven by a {{convert|1200|hp|0|adj=on}} electric motor. They could reach {{convert|9.5|kn|lk=in}} on the surface and {{convert|15|kn}} underwater. On the surface, the R class had a range of {{convert|2400|nmi|lk=in}} at {{convert|9|kn|}} and {{convert|60|nmi|abbr=on|lk=in}} at {{convert|5|kn|}} submerged.[4] The boats were armed with six 18-inch (45 cm) torpedo tubes in the bow. They carried six reload torpedoes for a grand total of a dozen torpedoes. They were equipped with an array of five hydrophones in the bow to allow them to locate and engage targets while submerged.[4] Construction and careerHMS R12 was laid down on 1 December 1917 by Cammell Laird at Birkenhead, launched on 9 April 1918 and commissioned on 29 October 1919. She came too late to see any combat in World War I, like most of the other R class submarines. R12 was paid off in December 1919, and sold on 21 February 1923 to J. Smith. Notes1. ^Gardiner & Gray, p. 93
2. ^Harrison, Chapter 19
3. ^Harrison, Chapter 25
4. ^1 Harrison, Chapter 10
References- {{cite book|last=Akermann|first=Paul|title=Encyclopaedia of British Submarines 1901–1955|edition=reprint of the 1989|year=2002|publisher=Periscope Publishing|location=Penzance, Cornwall|isbn=1-904381-05-7}}
- {{Colledge}}
- {{cite book |editor1-last=Gardiner|editor1-first=Robert|editor2-last=Gray|editor2-first=Randal|title=Conway's All the World's Fighting Ships: 1906–1921|year=1984|location=Annapolis, Maryland|publisher=Naval Institute Press|isbn=0-85177-245-5|lastauthoramp=y}}
- {{cite web|url=http://www.rnsubs.co.uk/Boats/BR3043/chapter07.php|title=The Development of HM Submarines From Holland No. 1 (1901) to Porpoise (1930) (BR3043)|last=Harrison|first=A. N.|date=January 1979|publisher=Submariners Association: Barrow in Furness Branch|accessdate=19 August 2015|deadurl=yes|archiveurl=https://web.archive.org/web/20150519040644/http://www.rnsubs.co.uk/Boats/BR3043/chapter07.php|archivedate=19 May 2015|df=dmy-all}}
{{DEFAULTSORT:R12}} 3 : British R-class submarines|Royal Navy ship names|1918 ships |