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HMS C20
HMS ''C20'' was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century. The boat survived the First World War and was sold for scrap in 1921.
==Design and description==
The C-class boats of the 1907–08 and subsequent Naval Programmes were modified to improve their speed, both above and below the surface. The submarine had a length of overall, a beam of and a mean draft of . They displaced on the surface and submerged. The C-class submarines had a crew of two officers and fourteen ratings.〔Gardiner & Gray, p. 87〕
For surface running, the boats were powered by a single 12-cylinder〔Harrison, Chapter 25〕 Vickers petrol engine that drove one propeller shaft. When submerged the propeller was driven by a electric motor.〔 They could reach on the surface and underwater. On the surface, the C class had a range of at .〔Harrison, Chapters 3〕
The boats were armed with two 18-inch (45 cm) torpedo tubes in the bow. They could carry a pair of reload torpedoes, but generally did not as they would have to remove an equal weight of fuel in compensation.〔Harrison, Chapter 27〕
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