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SM ''UB-47'' was a Type UB II submarine or U-boat for the German Imperial Navy ((ドイツ語:Kaiserliche Marine)) during World War I. ''UB-47'' was sold to the Austro-Hungarian Navy ((ドイツ語:Kaiserliche und Königliche Kriegsmarine ''or'' K.u.K. Kriegsmarine)) during the war. In Austro-Hungarian service the ''B'' was dropped from her name and she was known as SM ''U-47'' or ''U-XLVII'' as a member of the Austro-Hungarian ''U-43'' class. ''UB-47'' was ordered in July 1915 and was laid down at the AG Weser shipyard in Bremen in September. ''UB-47'' was a little more than in length and displaced between , depending on whether surfaced or submerged. She was equipped to carry a complement of four torpedoes for her two bow torpedo tubes and had an deck gun. As part of a group of six submarines selected for Mediterranean service, ''UB-47'' was broken into railcar sized components and shipped to Pola where she was assembled and launched in June 1916, and commissioned in July. Over the next year the U-boat sank twenty ships, which included the French battleship and two Cunard Line steamers in use as troopships, and . The German Imperial Navy was having difficulties in finding trained submarine crews and offered to sell ''UB-47'' and a sister boat to the Austro-Hungarian Navy. After the terms were agreed to in June 1917, both boats were handed over at Pola. When commissioned into the Austro-Hungarian Navy, the ''B'' in her designation was dropped so that she became ''U-47'' or ''U-XLVII''. She sank an additional three ships in Austro-Hungarian service through the end of the war. ''U-47'' was ceded to France as a war reparation in 1920 and broken at Bizerta that same year. == Design and construction == The German UB II design improved upon the design of the UB I boats, which had been ordered in September 1914.〔Gardiner, p. 174.〕 In service, the UB I boats were found to be too small and too slow. A major problem was that, because they had a single propeller shaft/engine combo, if either component failed, the U-boat became almost totally disabled.〔Miller, p. 48.〕 To rectify this flaw, the UB II boats featured twin propeller shafts and twin engines (one shaft for each engine), which also increased the U-boat's top speed.〔Williamson, p. 13.〕 The new design also included more powerful batteries,〔 larger torpedo tubes, and a deck gun.〔Tarrant, p. 172.〕 As a UB II boat, ''U-47'' could also carry twice the torpedo load of her UB I counterparts, and nearly ten times as much fuel.〔 To contain all of these changes the hull was larger,〔 and the surface and submerged displacement was more than double that of the UB I boats.〔 The Imperial German Navy ordered ''UB-47'' from AG Weser on 31 July 1915 as the final boat of a series of six UB II boats (numbered from to ''UB-47''), and the last UB II submarine numerically.〔〔The successor class to the UB II submarines, the UB III type, were numbered beginning with .〕 ''UB-47'' was long and abeam. She had a single hull with saddle tanks and had a draft of when surfaced. She displaced while submerged but only on the surface.〔 The submarine was equipped with twin diesel engines and twin electric motors—for surfaced and submerged running, respectively. ''UB-47'' had a surface speed of up to and could go as fast as while underwater.〔 The U-boat could carry up to of diesel fuel, giving her a range of at 5 knots〔 (12,850 km at 9.3 km/h). Her electric motors and batteries provided a range of at 4 knots〔 (83 km at 7.4 km/h) while submerged. ''UB-47'' was equipped with two bow torpedo tubes and could carry four torpedoes. The U-boat was also armed with an 88 mm/26 (3.5 in) deck gun and an machine gun. ''UB-47'' was laid down by AG Weser at its Bremen shipyard on 4 September 1915.〔 As one of six U-boats selected for service in the Mediterranean while under construction, ''UB-47'' was broken into railcar-sized components and shipped overland to the Austro-Hungarian port of Pola.〔Halpern, p. 383.〕〔Miller, p. 49.〕 Shipyard workers from Weser assembled the boat and her five sisters at Pola,〔 where she was launched on 17 June.〔 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 UB-47」の詳細全文を読む スポンサード リンク
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