SM UB-81

	UB-148 at sea, a U-boat similar to UB-81.
History
German Empire
Name	UB-81
Ordered	23 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
General characteristics
Class and type	German Type UB III submarine
Type	Coastal submarine
Displacement	516 t (508 long tons) surfaced; 647 t (637 long tons) submerged;
Length	55.85 m (183 ft 3 in) (o/a)
Beam	5.80 m (19 ft)
Draught	3.72 m (12 ft 2 in)
Propulsion	2 shafts; 2 × Körting six-cylinder fourstroke diesel engines, 1,050 bhp (780 kW); 2 × Brown, Boveri & Cie electric motors, 580 kW (780 shp);
Speed	13.4 knots (24.8 km/h; 15.4 mph) surfaced; 7.5 knots (13.9 km/h; 8.6 mph) submerged;
Range	8,180 nmi (15,150 km; 9,410 mi) at 6 knots (11 km/h; 6.9 mph) surfaced; 50 nmi (93 km; 58 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged;
Test depth	50 m (160 ft)
Complement	3 officers, 31 men
Armament	5 × 50 cm (19.7 in) torpedo tubes (4 bow, 1 stern); 10 torpedoes; 1 × 8.8 cm (3.46 in) deck gun;
Service record
Part of:	Flandern I Flotilla; 11 November – 2 December 1917;
Commanders:	Oblt.z.S. Reinhold Saltzwedel; 18 September – 2 December 1917;
Operations:	2 patrols
Victories:	1 merchant 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, 29 crew members died in the event.

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