SM UB-28 was a German Type UB II submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. The U-boat was ordered on 30 April 1915 and launched on 20 December 1915. She was commissioned into the German Imperial Navy on 27 December 1915 as SM UB-28.[1]
UB-28 was surrendered to Britain in accordance with the requirements of the Armistice with Germany on 24 November 1918. She was ultimately broken up at Bo'ness in 1919-20.
A Type UB II submarine, UB-28 had a displacement of 265t when at the surface and 291t while submerged. She had a total length of 36.13m (118.54feet), a beam of 4.36m (14.3feet), and a draught of 3.660NaN0. The submarine was powered by two Benz six-cylinder diesel engines producing a total 267PS, two Siemens-Schuckert electric motors producing 280PS, 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-28 was fitted with two torpedo tubes, four torpedoes, and one 5sp=usNaNsp=us SK L/40 deck gun. She had a complement of twenty-one crew members and two officers and a thirty-second dive time.