| Career (German Empire) | |
|---|---|
| Name: | UB-18 |
| Ordered: | 30 April 1915[1] |
| Builder: | Blohm & Voss, Hamburg[2] |
| Yard number: | 248[1] |
| Launched: | 21 August 1915[1] |
| Commissioned: | 10 December 1915[1] |
| Fate: | rammed and sunk, 9 December 1917[1] |
| General characteristics | |
| Class and type: | German Type UB II submarine |
| Displacement: | 263 t (290 short tons), surfaced[2] 292 t (322 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: | 9.15 knots (16.95 km/h), surfaced[2] 5.81 knots (10.76 km/h), submerged |
| Endurance: | 6,650 nautical miles @ 5 knots, surfaced[3] (12,300 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-18 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 21 August 1915. She was commissioned into the German Imperial Navy on 10 December 1915 as SM UB-18.[Note 1] The submarine sank 130 ships in 31 patrols. UB-18 was rammed by the trawler Ben Lawer and sunk in the English Channel on 9 December 1917.[1]
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