SM U-109
Introduction '''SM ''U-109''''' was a Type U 93 submarine of the Imperial German Navy in World War I, taking part in the First Battle of the Atlantic. The building contract was confirmed 5 May 1916, and was awarded to Germaniawerft, Kiel. A Type 93 boat, she was launched 25 September 1917 and commissioned 7 November. She was under the command of Otto Ney. On 28 January 1918, she was sunk  in the English Channel, possibly by a mine, while diving to avoid ships from the Dover Patrol (particularly drifter H.M. Beryl III). She sank no ships.
Design German Type U 93 submarines were preceded by the shorter Type U 87 submarines. ''U-109'' had a displacement of  when at the surface and  while submerged. She had a total length of , a pressure hull length of , a beam of , a height of , and a draught of . The submarine was powered by two  engines for use while surfaced, and two  engines for use while submerged. She had two propeller shafts and two  propellers. She 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, she could operate for  at ; when surfaced, she could travel  at . ''U-109'' was fitted with six  torpedo tubes (four at the bow and two at the stern), twelve to sixteen torpedoes, one  SK L/45 deck gun, and one  SK L/30 deck gun. She had a complement of thirty-six (thirty-two crew members and four officers).
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