HMS Sentinel (P256)

HMS Sentinel was a S-class submarine of the third batch built for the Royal Navy during World War II. She was not completed until after the war and was sold for scrap in 1962.

For other ships with the same name, see HMS Sentinel.

HMS Sentinel
History
Royal Navy EnsignUnited Kingdom
NameHMS Sentinel
BuilderScotts, Greenock
Laid down15 November 1943
Launched27 July 1945
Commissioned28 December 1945
FateSold 28 February 1962
Badge
General characteristics
Class and typeS-class submarine
Displacement
  • 814 long tons (827 t) surfaced
  • 990 long tons (1,010 t) submerged
Length217 ft (66.1 m)
Beam23 ft 9 in (7.2 m)
Draught14 ft 1 in (4.3 m)
Installed power
  • 1,900 bhp (1,400 kW) (diesel)
  • 1,300 hp (970 kW) (electric)
Propulsion
Speed
  • 14.75 knots (27.32 km/h; 16.97 mph) surfaced
  • 9 knots (17 km/h; 10 mph) submerged
Range7,500 nmi (13,900 km; 8,600 mi) at 10 knots (19 km/h; 12 mph) surface; 120 nmi (220 km; 140 mi) at 3 knots (5.6 km/h; 3.5 mph) submerged
Test depth350 feet (106.7 m)
Complement48
Armament

Design and description

The last 17 boats of the third batch were significantly modified from the earlier boats. They had a stronger hull, carried more fuel and their armament was revised. The submarines had a length of 217 feet (66.1 m) overall, a beam of 23 feet 9 inches (7.2 m) and a draft of 14 feet 1 inch (4.3 m). They displaced 814 long tons (827 t) on the surface and 990 long tons (1,010 t) submerged.[1] The S-class submarines had a crew of 48 officers and ratings. They had a diving depth of 350 feet (106.7 m).[2]

For surface running, the boats were powered by two 950-brake-horsepower (708 kW) diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 650-horsepower (485 kW) electric motor.[3] They could reach 14.75 knots (27.32 km/h; 16.97 mph) on the surface and 9 knots (17 km/h; 10 mph) underwater.[1] On the surface, the third batch boats had a range of 7,500 nautical miles (13,900 km; 8,600 mi) at 10 knots (19 km/h; 12 mph) and 120 nmi (220 km; 140 mi) at 3 knots (5.6 km/h; 3.5 mph) submerged.[2]

Sentinel was armed with six 21 inch (533 mm) torpedo tubes in the bow. She carried six reload torpedoes for a grand total of a dozen torpedoes. Twelve mines could be carried in lieu of the torpedoes. The boat was also equipped with a 4-inch (102 mm) deck gun.[1]

Construction and career

HMS Sentinel was built by Scotts of Greenock and launched on 27 July 1945. Commissioned after the Second World War, she had a peaceful career. In 1953 she took part in the Fleet Review to celebrate the Coronation of Queen Elizabeth II.[4] Sentinel was sold on 28 February 1962, being broken up at Gillingham.[5]

Notes
  1. Chesneau, p. 52
  2. McCartney, p. 7
  3. Bagnasco, p. 110
  4. Souvenir Programme, Coronation Review of the Fleet, Spithead, 15th June 1953, HMSO, Gale and Polden
  5. HMS Sentinel, Uboat.net

References
  • Akermann, Paul (2002). Encyclopaedia of British Submarines 1901–1955 (reprint of the 1989 ed.). Penzance, Cornwall: Periscope Publishing. ISBN 1-904381-05-7.
  • Bagnasco, Erminio (1977). Submarines of World War Two. Annapolis, Maryland: Naval Institute Press. ISBN 0-87021-962-6.
  • Chesneau, Roger, ed. (1980). Conway's All the World's Fighting Ships 1922–1946. Greenwich, UK: Conway Maritime Press. ISBN 0-85177-146-7.
  • 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.
  • McCartney, Innes (2006). British Submarines 1939–1945. New Vanguard. Vol. 129. Oxford, UK: Osprey. ISBN 1-84603-007-2.
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