HMS R7
 R-class submarine | |
| History | |
|---|---|
 | |
| Name: | HMS R7 |
| Builder: | Vickers, Barrow-in-Furness |
| Laid down: | 1 November 1917 |
| Launched: | 14 May 1918 |
| Commissioned: | 29 June 1918 |
| Fate: | Sold, 21 February 1923 |
| General characteristics | |
| Class and type: | R-class submarine |
| Displacement: |
|
| Length: | 163 ft 9 in (49.91 m) |
| Beam: | 15 ft 3 in (4.65 m) |
| Draught: | 11 ft 6 in (3.51 m) |
| Installed power: |
|
| Propulsion: |
|
| Speed: |
|
| Range: | 2,400 nmi (4,400 km; 2,800 mi) at 9 knots (17 km/h; 10 mph) surfaced; 60 nmi (110 km; 69 mi) at 5 knots (9.3 km/h; 5.8 mph) submerged |
| Test depth: | 150 feet (45.7 m) |
| Complement: | 2 officers and 20 ratings |
| Sensors and processing systems: | Bow hydrophone array |
| Armament: | 6 × bow 18-inch (45 cm) torpedo tubes |
HMS R7 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 description
The 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 163 feet 9 inches (49.9 m) overall, a beam of 15 feet 3 inches (4.6 m) and a mean draft of 11 feet 6 inches (3.5 m). They displaced 410 long tons (420 t) on the surface and 503 long tons (511 t) submerged. The R-class submarines had a crew of 2 officers and 20 ratings.[1] They had a diving depth of 150 feet (45.7 m).[2]
For surface running, the boats were powered by a single eight-cylinder [3] 240-brake-horsepower (179 kW) diesel engine that drove the single propeller shaft. When submerged it was driven by a 1,200-horsepower (895 kW) electric motor. They could reach 9.5 knots (17.6 km/h; 10.9 mph) on the surface and 15 knots (28 km/h; 17 mph) underwater. On the surface, the R class had a range of 2,400 nautical miles (4,400 km; 2,800 mi) at 9 knots (17 km/h; 10 mph) and 60 nmi (110 km; 69 mi) at 5 knots (9.3 km/h; 5.8 mph) 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 career
HMS R7 was laid down on 1 November 1917 by Vickers Limited at Barrow-in-Furness, launched on 14 May 1918 and commissioned on 29 June. She came too late to see any combat in World War I, like most of the other R class submarines. In the Navy List for November 1918, she was based at Donegal. R7 was sold on 21 February 1923 to E. Suren.
Notes
References
- Akermann, Paul (2002). Encyclopaedia of British Submarines 1901–1955 (reprint of the 1989 ed.). Penzance, Cornwall: Periscope Publishing. ISBN 1-904381-05-7.
- Colledge, J. J.; Warlow, Ben (2006) [1969]. Ships of the Royal Navy: The Complete Record of all Fighting Ships of the Royal Navy (Rev. ed.). London: Chatham Publishing. ISBN 978-1-86176-281-8. OCLC 67375475.
- Gardiner, Robert & Gray, Randal, eds. (1984). Conway's All the World's Fighting Ships: 1906–1921. Annapolis, Maryland: Naval Institute Press. ISBN 0-85177-245-5.
- Harrison, A. N. (January 1979). "The Development of HM Submarines From Holland No. 1 (1901) to Porpoise (1930) (BR3043)". Submariners Association: Barrow in Furness Branch. Retrieved 19 August 2015.