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HMS Unrivalled (P45)
HMS ''Unrivalled'' (P45) was a ''U''-class submarine built for the Royal Navy during World War II. So far she has been the only ship of the Royal Navy to bear the name ''Unrivalled''. Completed in 1942, the boat spent most of the war in the Mediterranean. She sank a number of small merchant ships and naval auxiliaries, but major success eluded her during the war. Too small and slow for the post-war environment, ''Unrivalled'' was scrapped in 1946.
==Design and description==
HMS ''Unrivalled'' was one of the second group of ''U''-class submarines ordered on 23 August 1940.〔Akermann, p. 409〕 These submarines differed from their predecessors in that they were lengthened by "to give a more streamlined shape aft and to improve the flow of water over the propellers."〔Bragnasco, p. 121〕
The submarine was long and abeam. ''Unrivalled'' had a single hull with internal ballast tanks and had a draft of when surfaced. She displaced while submerged, but only on the surface.〔Bragnasco, p. 120〕 The submarine was equipped with two diesel engines and twin General Electric electric motors—for surfaced and submerged running, respectively. They were coupled together with a diesel-electric transmission. ''Unrivalled'' had a surface speed of up to and could go as fast as while underwater. The boat could carry up to of diesel fuel, giving her a range of at . Her electric motors and batteries provided a range of at while submerged.〔
HMS ''Unrivalled'' was equipped with four bow torpedo tubes and could carry eight torpedoes. The submarine was also armed with a QF Mk I gun deck gun. She had a crew of 33 men.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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