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HMS R4
HMS ''R4'' 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 1934.
==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 overall, a beam of and a mean draft of . They displaced on the surface and submerged. The R-class submarines had a crew of 2 officers and 20 ratings.〔Gardiner & Gray, p. 93〕 They had a diving depth of .〔Harrison, Chapter 19〕
For surface running, the boats were powered by a single eight-cylinder 〔Harrison, Chapter 25〕 diesel engine that drove the single propeller shaft. When submerged it was driven by a electric motor. They could reach on the surface and underwater. On the surface, the R class had a range of at and at submerged.〔Harrison, Chapter 10〕
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.〔
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