| Career (German Empire) | |
|---|---|
| Name: | UB-27 |
| Ordered: | 30 April 1915[1] |
| Builder: | AG Weser, Bremen[2] |
| Yard number: | 241[1] |
| Launched: | 20 December 1915[1] |
| Commissioned: | 23 February 1916[1] |
| Fate: | disappeared in July 1917; possibly sunk by HMS Halcyon on 29 July 1917[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-27 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 23 February 1916 as SM UB-27.[Note 1] She sank 12 ships in 17 patrols.
On 29 April 1916 in the North Sea about 15 miles (24 km) south-east of Souter Point near Whitburn, County Durham, SM UB-27 opened with her deck gun fire at SS Wandle, an 889 GRT "flat-iron" collier of the Wandsworth, Wimbledon and Epsom District Gas Company.[4] The collier engaged the submarine and survived.[4] Afterwards in Britain it was believed Wandle had sunk UB-27 and the master, G.E.A. Mastin, and his crew were celebrated.[5][6]
UB-27 disappeared after 22 July 1917. HMS Halcyon 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.[1]
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