SM UB-81
UB-148 at sea, a U-boat similar to UB-81.
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| History | |
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 German Empire
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| Name: | UB-81 |
| Ordered: | 23 September 191623 September 1916 |
| Builder: | AG Weser, Bremen |
| Cost: | 3,341,000 German Papiermark |
| Yard number: | 281 |
| Laid down: | 5 January 1917 |
| Launched: | 18 August 1917 |
| Commissioned: | 18 September 1917 |
| Fate: | lost 2 December 1917 after striking a mine at 50°27′N 0°53′W / 50.450°N 0.883°WCoordinates: 50°27′N 0°53′W / 50.450°N 0.883°W |
| General characteristics | |
| Class and type: | German Type UB III submarine |
| Type: | Coastal submarine |
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| Length: | 55.85 m (183 ft 3 in) (o/a) |
| Beam: | 5.80 m (19 ft) |
| Draught: | 3.72 m (12 ft 2 in) |
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| Test depth: | 50 m (160 ft) |
| Complement: | 3 officers, 31 men |
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| Service record | |
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| Commanders: |
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| Operations: | 2 patrols |
| Victories: | 1 commercial ship sunk (3,218 GRT) |
SM UB-81 was a German Type UB III submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. She was commissioned into the German Imperial Navy on 18 September 1917 as SM UB-81.
UB-81 was sunk 2 December 1917 by a mine at 50°27′N 0°53′W / 50.450°N 0.883°W, 29 crew members died in the event.
UB-81 was ordered by the GIN on 23 September 1916 and her keel was laid down on 5 January 1917. She was built by AG Weser of Bremen and following just under a year of construction, launched at Bremen on 4 August 1917. UB-81 was commissioned later that same year under the command of Reinhold Saltzwedel. Like all Type UB III submarines, UB-81 carried 10 torpedoes and was armed with a 8.8 cm (3.46 in) deck gun. UB-81 would carry a crew of up to 3 officer and 31 men and had a cruising range of 8,180 nautical miles (15,150 km; 9,410 mi). UB-81 had a displacement of 516 t (508 long tons) while surfaced and 647 t (637 long tons) when submerged. Her engines enabled her to travel at 13.4 knots (24.8 km/h; 15.4 mph) when surfaced and 7.5 knots (13.9 km/h; 8.6 mph) when submerged.
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