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SM ''U-2'' or ''U-II'' was a ''U-1''-class submarine or U-boat built for and operated by the Austro-Hungarian Navy ((ドイツ語:Kaiserliche und Königliche Kriegsmarine ''or'' K.u.K. Kriegsmarine)). ''U-2'' was designed by American Simon Lake's Lake Torpedo Boat Company and built at the navy yard in Pola. She was one of two Lake-designed submarines purchased as part of a competitive evaluation of three foreign submarine designs. ''U-2'' was launched in April 1909 and was long and displaced almost surfaced and just under when submerged. The Austro-Hungarian Navy conducted trials for ''U-2'' through 1910. The U-boat was originally powered by two gasoline engines for surface running, and two electric motors when submerged, but during her evaluation period, the gasoline engines were found to be incapable of reaching the contracted speed. ''U-2'' was commissioned in June 1911 and served as a training boat for the Austro-Hungarian Navy through 1914. At the beginning of World War I, ''U-2'' was not operational because she was in drydock awaiting replacement diesel engines. With her new engines and a new conning tower installed by June 1915, ''U-2'' conducted reconnaissance cruises out of Trieste but was declared obsolete in early 1918. ''U-2'' remained in service as a training boat at the submarine base on Brioni, but was at Pola at the end of the war. She was ceded to Italy as a war reparation in 1920 and scrapped at Pola. ''U-2'' did not sink any ships during the war. == Design and construction == ''U-2'' was built as part of a plan by the Austro-Hungarian Navy to competitively evaluate foreign submarine designs from Simon Lake, Germaniawerft, and John Philip Holland.〔Gardiner, p. 340.〕 The Austro-Hungarian Navy ordered plans for ''U-2'' (and sister ship ''U-1'') in 1906 from the Lake Torpedo Boat Company of Bridgeport, Connecticut.〔Gibson and Prendergast, p. 383.〕 ''U-2'' was built at the Pola Navy Yard and was launched on 3 April 1909.〔〔In their book ''The German Submarine War, 1914–1918'', R. H. Gibson and Maurice Prendergast report that ''U-2'' was launched in 1910 (p. 383).〕 ''U-2'' had several features typical of Lake's designs, including a diving chamber under the bow and two variable pitch propellers. Lake's design also called for two retractable wheels that allowed travel over the seabed. The design also placed the diving tanks above the waterline of the single, cylindrical hull, which necessitated a heavy ballast keel for vertical stability. This arrangement required mechanical pumping, a procedure that took 8 minutes. ''U-2''s propulsion system consisted of two gasoline engines for surface running and two electric motors for running while submerged.〔 The boat was long by abeam and had a draft of . As designed, her displacement was surfaced and submerged.〔 She was outfitted with three torpedo tubes—two in the bow, one in the stern—and could carry up to five torpedoes,〔 but typically carried three.〔 ''U-2'' was also armed with a deck gun.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「SM U-2 (Austria-Hungary)」の詳細全文を読む スポンサード リンク
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