SM UB-23

For other ships with the same name, see German submarine U-23.
SM UB-45, a U-boat similar to UB-23
History
German Empire
NameUB-23
Ordered30 April 1915[1]
BuilderBlohm & Voss, Hamburg[1]
Yard number253[1]
Launched9 October 1915[1]
Commissioned13 March 1916[1]
FateInterned at Corunna, Spain, 29 July 1917
General characteristics [2]
Class and typeType UB II submarine
Displacement
  • 263 t (259 long tons) surfaced
  • 292 t (287 long tons) submerged
Length
Beam
  • 4.36 m (14 ft 4 in) o/a
  • 3.85 m (13 ft) pressure hull
Draught3.70 m (12 ft 2 in)
Propulsion
Speed
  • 9.15 knots (16.95 km/h; 10.53 mph) surfaced
  • 5.81 knots (10.76 km/h; 6.69 mph) submerged
Range
  • 6,450 nmi (11,950 km; 7,420 mi) at 5 knots (9.3 km/h; 5.8 mph) surfaced
  • 45 nmi (83 km; 52 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth50 m (160 ft)
Complement2 officers, 21 men
Armament
Notes45-second diving time
Service record
Part of:
  • Flandern Flotilla
  • 19 May 1916 – 29 July 1917
Commanders:
  • Oblt.z.S. Ernst Voigt[3]
  • 13 March – 9 November 1916
  • Oblt.z.S. Heinz Ziemer[4]
  • 10 November 1916 – 5 February 1917
  • Oblt.z.S. Herbert Lefholz[5]
  • 6 – 18 February 1917
  • Oblt.z.S. Matthias Graf von Schmettow[6]
  • 19 February – 19 March 1917
  • Oblt.z.S. Hans Ewald Niemer[7]
  • 20 March – 29 July 1917
Operations: 21 patrols
Victories:
  • 51 merchant ships sunk
    (33,880 GRT)
  • 1 merchant ship damaged
    (419 GRT)

SM UB-23[Note 1] was a German Type UB II submarine or U-boat in the German Imperial Navy (‹See Tfd›German: Kaiserliche Marine) during World War I. The U-boat was ordered on 30 April 1915 and launched on 9 October 1915. She was commissioned into the Imperial German Navy on 13 March 1916 as SM UB-23. The submarine sank 51 ships in 21 patrols for a total of 33,880 gross register tons (GRT).[8] On 26 July 1917, UB-23 was badly damaged by a depth charge attack by HMS PC-60 off the Lizard; she put in at Corunna, Spain, on 29 July 1917 and was interned.[9] On 22 January 1919 she was surrendered to France in accordance with the requirements of the Armistice with Germany, and she was broken up in Cherbourg in July 1921.

  1. ^ a b c d e Rössler 1979, p. 64.
  2. ^ Gröner 1991, pp. 23–25.
  3. ^ Helgason, Guðmundur. "WWI U-boat commanders: Ernst Voigt (Royal House Order of Hohenzollern)". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 29 January 2015.
  4. ^ Helgason, Guðmundur. "WWI U-boat commanders: Heinz Ziemer". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 29 January 2015.
  5. ^ Helgason, Guðmundur. "WWI U-boat commanders: Herbert Lefholz". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 29 January 2015.
  6. ^ Helgason, Guðmundur. "WWI U-boat commanders: Matthias Graf von Schmettow (Royal House Order of Hohenzollern)". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 29 January 2015.
  7. ^ Helgason, Guðmundur. "WWI U-boat commanders: Hans Ewald Niemer". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 29 January 2015.
  8. ^ Bendert 2000, p. 195.
  9. ^ "UB 23". Uboat.net. Retrieved 1 November 2012.


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