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USS Nautilus (SS-168)
USS ''Nautilus'' (SF-9/SS-168), a and one of the "V-boats", was the third ship of the United States Navy to bear the name. She was originally named and designated ''V-6'' (SF-9), but was redesignated and given hull classification symbol SC-2 on 11 February 1925. Her keel was laid on 10 May 1927 by the Mare Island Naval Shipyard of Vallejo, California. She was launched on 15 March 1930 sponsored by Miss Joan Keesling, and commissioned on 1 July 1930 with Lieutenant Commander Thomas J. Doyle, Jr. in command.
==Design==
The configuration of ''V-4'', ''V-5'', and ''V-6'' resulted from an evolving strategic concept that increasingly emphasized the possibility of a naval war with Japan in the far western Pacific. This factor, and the implications of the 1922 Washington Naval Treaty, suggested the need for long-range submarine "cruisers", or "strategic scouts", as well as long-range minelayers, for which long endurance, not high speed, was most important. The design was possibly influenced by the German "U-cruisers" of the Type U-139 and Type U-151 U-boat classes, although ''V-4'', ''V-5'', and ''V-6'' were all larger than these. A raised gun platform was provided around the conning tower, and deck stowage for spare torpedoes was included under the platform and in the superstructure. ''V-6'' and her near-sisters ''V-4'' () and ''V-5'' () were initially designed with larger and more powerful MAN-designed diesel engines than the Busch-Sulzer engines that propelled earlier V-boats, which were failures. Unfortunately, the specially-built engines failed to produce their design power, and some developed dangerous crankcase explosions. The engineering plant was replaced in 1941-42.〔
The as-built engine specifications were two BuEng-built, MAN-designed〔 direct-drive 10-cylinder 4-cycle main diesel engines, each, with two BuEng MAN〔Alden, p.210.〕 4-cycle 6-cylinder auxiliary diesel engines, each, driving 〔 electrical generators.〔 The auxiliary engines were for charging batteries or for increased surface speed via a diesel-electric system providing power to the main electric motors.
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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