| Career (German Empire) | |
|---|---|
| Name: | UB-28 |
| Ordered: | 30 April 1915[1] |
| Builder: | AG Weser, Bremen[2] |
| Yard number: | 242[1] |
| Launched: | 31 December 1915[1] |
| Commissioned: | 7 January 1916[1] |
| Fate: | surrendered, November 1918; broken up, 1919[1] |
| General characteristics | |
| Class and type: | German Type UB II submarine |
| Displacement: | 265 t (292 short tons), surfaced[2] 291 t (321 short tons), submerged |
| Length: | 118 ft 5 in (36.09 m)[3] |
| Beam: | 14 ft 5 in (4.39 m)[3] |
| Draft: | 12 ft 2 in (4 m)[3] |
| Propulsion: | 2 × propeller shafts 2 × diesel engines, 270–284 bhp (200–212 kW)[3] 2 × electric motor, 280 shp (210 kW)[3] |
| Speed: | 8.90 knots (16.48 km/h), surfaced[2] 5.72 knots (10.59 km/h), submerged |
| Endurance: | 8,150 nautical miles @ 5 knots, surfaced[3] (15,090 km @ 9.3 km/h) 45 nautical miles @ 4 knots, submerged[3] (83 km @ 7.4 km/h) |
| Test depth: | 50 m (160 ft)[3] |
| Complement: | 22[3] |
| Armament: | 2 × 50 cm (19.7 in) torpedo tubes[3] 4 × torpedoes (later 6) 1 × 5 cm (2.0 in) deck gun[3] |
| Notes: | 32-second diving time[2] |
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 31 December 1915. She was commissioned into the German Imperial Navy on 7 January 1916 as SM UB-28.[Note 1] UB-28 was surrendered on 24 November 1918 and broken up at Bo'ness in 1919.[1]
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