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SM UB-20
SM ''UB-20'' was a German Type UB II submarine or U-boat in the German Imperial Navy ((ドイツ語:Kaiserliche Marine)) during World War I. The U-boat was ordered on 30 April 1915 and launched on 26 September 1915. She was commissioned into the German Imperial Navy on 10 February 1916 as SM ''UB-20''.〔"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''.〕 The submarine sank 13 ships in 15 patrols for a total of . ''UB-20'' was mined and sunk on 28 July 1917 at . Thirteen crew members died in the event.
==Design==
A German Type UB II submarine, ''UB-20'' had a displacement of when at the surface and while submerged. It had a total length of , a beam of , and a draught of . The submarine was powered by two Daimler-Motoren-Gesellschaft six-cylinder, four-stroke diesel engines each producing a total , a Siemens-Schuckert electric motor producing , and one propeller shaft. It was capable of operating at depths of up to .
The submarine had a maximum surface speed of and a maximum submerged speed of . When submerged, it could operate for at ; when surfaced, it could travel at . ''UB-20'' was fitted with two torpedo tubes, four torpedoes, and one SK L/40 deck machine gun. It had a complement of twenty-one crew members and one officer and a 45-second dive time.
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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