SM UB-20
SM UB-20 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 26 September 1915. She was commissioned into the German Imperial Navy on 10 February 1916 as SM UB-20. The submarine sank 13 ships in 15 patrols for a total of. UB-20 was mined and sunk on 28 July 1917 at. Fifteen crew members died in the event.
Design
A Type UB II submarine, UB-20 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 Körting six-cylinder, four-stroke diesel engines each producing a total, a Siemens-Schuckert electric motor 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-20 was fitted with two torpedo tubes, four torpedoes, and one SK L/40 deck gun. She had a complement of twenty-three crew members and two officers and a 45-second dive time.