SM UB-27
SM "UB-27" was a German Type UB II submarine or U-boat in the German Imperial Navy () during World War I. The U-boat was ordered on 30 April 1915 and launched on 10 February 1916. She was commissioned into the German Imperial Navy on 23 February 1916 as SM "UB-27". "UB-27" sank 11 ships in 17 patrols for a total of . Design. A German Type UB II submarine, "UB-27" had a displacement of when at the surface and while submerged. She had a total length of , a beam of , and a draught of . The submarine was powered  by two Benz six-cylinder diesel engines producing a total , two Siemens-Schuckert electric motors producing , and one propeller shaft. 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 . "UB-26" was fitted with two torpedo tubes, four torpedoes, and one SK L/40 deck gun. She had a complement of twenty-one crew members and two officers and a thirty-second dive time. Service history. On 29 April 1916 in the North Sea  about south-east of Souter Point near Whitburn, County Durham, "UB-27" opened with her deck gun fire at , an "flat-iron" collier of the Wandsworth, Wimbledon and Epsom District Gas Company. The collier engaged the submarine and survived. Afterwards in Britain it was believed "Wandle" had sunk "UB-27" and the master, G.E.A. Mastin, and his crew were celebrated. "UB-27" disappeared after 22 July 1917. reported ramming and depth charging a U-boat on 29 July 1917. A postwar German study concluded that it was possible that "Halcyon" sank "UB-27" at .