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U-52-class submarine
The ''U-52'' class was a class of four ocean-going submarines or U-boats planned for the Austro-Hungarian Navy ((ドイツ語:Kaiserliche und Königliche Kriegsmarine ''or'' K.u.K. Kriegsmarine)) during World War I. The submarine design was based on the A 6 proposal submitted by Stabilimento Tecnico Triestino (STT) as part of a Navy design competition. STT, under its wartime name of Austriawerft, began construction on the first two boats in 1916, but neither boat was launched or completed before the end of the war. Both incomplete submarines were scrapped after the war ended. Neither of the third and fourth submarines was ever laid down.
== Design ==
Austria-Hungary's U-boat fleet was largely obsolete at the outbreak of World War I, and over the first two years of the war the Austro-Hungarian Navy focused its efforts on building a U-boat fleet for local defense within the Adriatic. With boats to fill that need either under construction or purchased from Germany, efforts were focused on building ocean-going submarines for operation in the wider Mediterranean, outside the Adriatic.〔Gardiner, p. 341.〕
To that end, the Austro-Hungarian Navy selected the Stabilimento Tecnico Triestino (STT) A 6 design as the winner of a design competition for a new ocean-going submarine. The plans called for a boat that displaced surfaced and submerged. The boats were to be long with a beam of and a draft of . For propulsion, the design featured two shafts, with twin diesel engines of (total) for surface running at up to , and twin electric motors of (total) for submerged travel at up to . The ''U-52'' class boats were designed for a crew of 40 men.〔
The ''U-52'' design called for six torpedo tubes—four bow tubes and two stern tubes—and a complement of nine torpedoes. The original design specified two 10 cm/35 (3.9 in) deck guns, which were superseded by two 12 cm/35 (4.7 in) deck guns in plans for the third and fourth boats.〔
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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