SM UB-121

For other ships with the same name, see German submarine U-121.
UB-148 at sea, a U-boat similar to UB-121.
History
German Empire
NameUB-121
Ordered6 / 8 February 1917[1]
BuilderAG Weser, Bremen
Cost3,654,000 German Papiermark
Yard number294
Laid down12 May 1917[2]
Launched6 January 1918[3]
Commissioned10 February 1918[3]
FateSurrendered 20 November 1918; wrecked in tow 15 April 1919
General characteristics [3]
Class and typeType UB III submarine
Displacement
  • 512 t (504 long tons) surfaced
  • 643 t (633 long tons) submerged
Length55.85 m (183 ft 3 in) (o/a)
Beam5.80 m (19 ft)
Draught3.72 m (12 ft 2 in)
Propulsion
Speed
  • 13.9 knots (25.7 km/h; 16.0 mph) surfaced
  • 7.6 knots (14.1 km/h; 8.7 mph) submerged
Range
  • 7,280 nmi (13,480 km; 8,380 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[3]
Armament
Service record
Part of:
  • III Flotilla
  • 19 May – 11 November 1918
Commanders:
  • Oblt.z.S. Albrecht Schmidt[4]
  • 10 February – 11 November 1918
Operations: 3 patrols
Victories: None

SM UB-121 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 10 February 1918 as SM UB-121.[Note 1]

UB-121 was surrendered to the Allies at Harwich on 20 November 1918 in accordance with the requirements of the Armistice with Germany. She was transferred to France in 1919, but while in tow to Brest in company with U-118 she ran aground at Birling Gap on 15 April 1919. The wreck was sold by the British Admiralty to R. Longmate for £500 on 3 May 1919, and broken up in situ, although a few pieces remain in situ.[5]

  1. ^ Rössler 1979, p. 55.
  2. ^ Helgason, Guðmundur. "WWI U-boats: UB 121". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 13 February 2009.
  3. ^ a b c d Gröner 1991, pp. 25–30.
  4. ^ Helgason, Guðmundur. "WWI U-boat commanders: Albrecht Schmidt". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 10 March 2015.
  5. ^ Dodson, Aidan; Cant, Serena (2020). Spoils of War: the fate of enemy fleets after the two World Wars. Barnsley: Seaforth. pp. 22, 55, 96, 130. ISBN 978-1-5267-4198-1.


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