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SM ''UB-3'' was a German Type UB I submarine or U-boat in the German Imperial Navy ((ドイツ語:Kaiserliche Marine)) during World War I. She disappeared on her first patrol in May 1915, and was the first of her class to be lost.〔 ''UB-3'' was ordered in October 1914 and was laid down at the Germaniawerft shipyard in Kiel in November. ''UB-3'' was a little more than in length and displaced between , depending on whether surfaced or submerged. She carried two torpedoes for her two bow torpedo tubes and was also armed with a deck-mounted machine gun. She was launched and commissioned as SM ''UB-3'' in March 1915.〔"SM" stands for "Seiner Majestät" ((英語:His Majesty's)) and combined with the ''U'' for ''Unterseeboot'' would be translated as ''His Majesty's Submarine''.〕 ''UB-3'' was broken into sections and shipped by rail to the Austro-Hungarian port of Pola in April for reassembly. She officially joined the Pola Flotilla on 1 May and departed on her first patrol for temporary duty in Turkey on 23 May, and was never seen again. A postwar German study concluded that ''UB-3'' was likely the victim of an unexplained technical problem in the absence of any minefields or enemy action. == Design and construction == After the German Army's rapid advance along the North Sea coast in the earliest stages of World War I, the German Imperial Navy found itself without suitable submarines that could be operated in the narrow and shallow environment off Flanders.〔Miller, pp. 46–47.〕〔Karau, p. 48.〕 Project 34, a design effort begun in mid-August 1914,〔 produced the Type UB I design: a small submarine that could be shipped by rail to a port of operations and quickly assembled. Constrained by railroad size limitations, the UB I design called for a boat about long and displacing about with two torpedo tubes.〔〔A further refinement of the design—replacing the torpedo tubes with mine chutes but changing little else—evolved into the Type UC I coastal minelaying submarine. See: Miller, p. 458.〕 ''UB-3'' was part of the initial allotment of eight submarines—numbered to —ordered on 15 October from Germaniawerft of Kiel, just shy of two months after planning for the class began.〔〔Williamson, p. 12.〕 ''UB-3'' was laid down by Germaniawerft on 3 November and was launched on 5 March 1915.〔 As built, ''UB-3'' was long, abeam, and had a draft of . She had a single Daimler 4-cylinder diesel engine for surface travel, and a single Siemens-Schuckert electric motor for underwater travel, both attached to a single propeller shaft. Her top speeds were , surfaced, and , submerged.〔 At more moderate speeds, she could sail up to on the surface before refueling, and up to submerged before recharging her batteries. Like all boats of the class, ''UB-3'' was rated to a diving depth of , and could completely submerge in 33 seconds. ''UB-3'' was armed with two torpedoes in two bow torpedo tubes. She was also outfitted for a single machine gun on deck. ''UB-3''s complement consisted of one officer and thirteen enlisted men.〔Karau, p. 49.〕 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-3」の詳細全文を読む スポンサード リンク
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