HMS ''Sentinel'' was a S-class submarine of the third batch built for the

Royal Navy The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by English and Scottish kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years' War against F ...

during World War II. She was not completed until after the war and was sold for scrap in 1962.

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 overall, a

beam Beam may refer to: Streams of particles or energy *Light beam, or beam of light, a directional projection of light energy **Laser beam *Particle beam, a stream of charged or neutral particles **Charged particle beam, a spatially localized grou ...

of and a draft of . They displaced on the surface and submerged.Chesneau, p. 52 The S-class submarines had a crew of 48 officers and ratings. They had a diving depth of .McCartney, p. 7 For surface running, the boats were powered by two

diesel engine The diesel engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to mechanical compression; thus, the diesel engine is a so-call ...

s, each driving one propeller shaft. When submerged each propeller was driven by a

electric motor An electric motor is an Electric machine, electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a Electromagneti ...

. They could reach on the surface and underwater. On the surface, the third batch boats had a range of at and at submerged. ''Sentinel'' was armed with six 21 inch (533 mm)

torpedo tube A torpedo tube is a cylindrical device for launching torpedoes. There are two main types of torpedo tube: underwater tubes fitted to submarines and some surface ships, and deck-mounted units (also referred to as torpedo launchers) installed aboa ...

s 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.

Construction and career

HMS ''Sentinel'' was built by

Scotts Scotts or Scott's may refer to: Businesses and brands *Scott's (restaurant), in London *Scott's Food & Pharmacy, an American supermarket chain *Scotts Miracle-Gro Company, an American multinational corporation *Scott's Porage Oats, a Scottish bre ...

Greenock Greenock (; sco, Greenock; gd, Grianaig, ) is a town and administrative centre in the Inverclyde council areas of Scotland, council area in Scotland, United Kingdom and a former burgh of barony, burgh within the Counties of Scotland, historic ...

and launched on 27 July 1945. Commissioned after the

Second World War World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...

, she had a peaceful career. In 1953 she took part in the Fleet Review to celebrate the Coronation of Queen Elizabeth II. ''Sentinel'' was sold on 28 February 1962, being broken up at Gillingham.HMS Sentinel
Uboat.net

Notes

References

* * * * * {{DEFAULTSORT:Sentinel British S-class submarines (1931) 1945 ships World War II submarines of the United Kingdom