SM UB-51

UB-148 at sea, a U-boat similar to UB-51.
History
German Empire
Name	UB-51
Ordered	20 May 1916[1]
Builder	Blohm & Voss, Hamburg
Cost	3,276,000 German Papiermark
Yard number	296
Launched	8 March 1917[2]
Commissioned	26 July 1917[2]
Fate	Surrendered 16 January 1919; broken up at Swansea[2]
General characteristics [2]
Class and type	Type UB III submarine
Displacement	516 t (508 long tons) surfaced 651 t (641 long tons) submerged
Length	55.30 m (181 ft 5 in) (o/a)
Beam	5.80 m (19 ft)
Draught	3.68 m (12 ft 1 in)
Propulsion	2 × propeller shaft 2 × MAN four-stroke 6-cylinder diesel engines, 1,085 bhp (809 kW) 2 × Siemens-Schuckert electric motors, 780 shp (580 kW)
Speed	13.6 knots (25.2 km/h; 15.7 mph) surfaced 8 knots (15 km/h; 9.2 mph) submerged
Range	9,040 nmi (16,740 km; 10,400 mi) at 6 knots (11 km/h; 6.9 mph) surfaced 55 nmi (102 km; 63 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth	50 m (160 ft)
Complement	3 officers, 31 men[2]
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:	Mittelmeer / Mittelmeer II Flotilla 19 October 1917 – 11 November 1918
Commanders:	Kptlt. Ernst Krafft 26 July 1917 – 27 November 1918
Operations:	6 patrols
Victories:	18 merchant ships sunk (47,514 GRT) 1 auxiliary warship sunk (257 GRT) 1 merchant ship damaged (3,905 GRT)

SM UB-51 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 Pola Flotilla of the German Imperial Navy on 26 July 1917 as SM UB-51.^{[Note 1]}

She operated as part of the Pola Flotilla based in Cattaro. UB-51 was surrendered 16 January 1919 with the remainder of the Pola Flotilla following orders by Admiral Reinhard Scheer to return to port. UB-51 was later broken up at Swansea.^[2]

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