SM UB-91

For other ships with the same name, see German submarine U-91.
UB-148 at sea, a U-boat similar to UB-91.
History
German Empire
NameUB-91
Ordered6 / 8 February 1917[2]
BuilderAG Vulcan, Hamburg
Cost3,654,000 German Papiermark
Yard number107
Launched6 March 1918[1]
Commissioned11 April 1918[1]
FateSurrendered 21 November 1918, broken up in 1921[1]
General characteristics [1]
Class and typeType UB III submarine
Displacement
  • 510 t (500 long tons) surfaced
  • 640 t (630 long tons) submerged
Length55.52 m (182 ft 2 in) (o/a)
Beam5.76 m (18 ft 11 in)
Draught3.73 m (12 ft 3 in)
Propulsion
Speed
  • 13 knots (24 km/h; 15 mph) surfaced
  • 7.4 knots (13.7 km/h; 8.5 mph) submerged
Range
  • 7,120 nmi (13,190 km; 8,190 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 depth50 m (160 ft)
Complement3 officers, 31 men[1]
Armament
Service record
Part of:
  • II Flotilla
  • 27 June – 11 November 1918
Commanders:
  • Kptlt. Wolf Hans Hertwig[3]
  • 11 April – 11 November 1918
Operations: 2 patrols
Victories:
  • 3 merchant ships sunk
    (13,487 GRT)
  • 1 warship sunk
    (1,181 tons)

SM UB-91 was a German Type UB III submarine or U-boat in the German Imperial Navy (‹See Tfd›German: Kaiserliche Marine) during World War I. She was commissioned into the German Imperial Navy on 11 April 1918 as SM UB-91.[Note 1]

On 4 October 1918 UB-91 sank the Hirano Maru, killing among others, Yokohama Specie Bank sub-manager S. Ujie, his wife and three sons, together with bank employee Takashi Aoki and wife Sueko.[4][5]

  1. ^ a b c d e f g h Gröner 1991, pp. 25–30.
  2. ^ Rössler 1979, p. 61.
  3. ^ Helgason, Guðmundur. "WWI U-boat commanders: Wolf Hans Hertwig". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 8 February 2015.
  4. ^ "The Torpedoed "Hirano Maru"". The Singapore Free Press and Mercantile Advertiser. 13 December 1918. Retrieved 4 January 2012.
  5. ^ "独政府を相手に損害賠償の訴え". Osaka Asahi Shinbun (in Japanese). 10 July 1919. Archived from the original on 2 March 2018. Retrieved 4 January 2012.


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