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River-class submarine
The River class, or ''Thames'' class were a class of submarines built for the Royal Navy. Operating during the Second World War, the three boats of the class comprised , and . All the submarines were named after rivers in the United Kingdom. One was lost during the war and the rest taken out of service following it.
==Design==
The River class was the last attempt by the Admiralty to produce "Fleet Submarines" that is submarines fast enough to operate as part of a fleet which at the time meant being able to manage somewhere around while surfaced. The previous attempts had been the steam powered K-class submarines and the large gunned M-class submarines. The M class were K-class hulls re-engined with diesels and modified to take a single naval gun directly forward of the conning tower.
A design was drawn up in the late 1920s and three vessels were built by Vickers in Barrow, ''Thames'' in 1932, ''Severn'' and ''Clyde'' in 1935. The latter were a little larger than ''Thames''. Initially 20 were planned but changes in thinking and cost limited the building to just the three.
The design compromised on diving depth to keep weight down and speed up. They had a safe diving depth of some compared to the before them which had managed . They were powered by two diesel engines delivering . Two Ricardo engines drove generators that supercharged the diesels up to . This gave them a surface speed of .
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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