SM UB-20

For other ships with the same name, see German submarine U-20.

SM UB-45, a U-boat similar to UB-20
History
German Empire
NameUB-20
Ordered30 April 1915[1]
BuilderBlohm & Voss, Hamburg[1]
Yard number250[1]
Launched26 September 1915[1]
Completed8 February 1916[1]
Commissioned10 February 1916
FateSunk by mine, 28 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 (12 ft 8 in) 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:
  • Baltic Flotilla
  • 12 March 1916 – 26 March 1917
  • Flandern Flotilla
  • 26 March – 28 July 1917
Commanders:
  • Oblt.z.S. Max Viebeg[3]
  • 10 February 1916 – 31 January 1917
  • Oblt.z.S. Hermann Glimpf[4]
  • 1 February – 28 July 1917
Operations: 15 patrols
Victories:
  • 13 merchant ships sunk
    (10,230 GRT)
  • 1 merchant ship damaged
    (7,241 GRT)
  • 1 merchant ship taken as prize
    (1,047 GRT)

SM UB-20[Note 1] was a German Type UB II submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. The U-boat was ordered on 30 April 1915 and launched on 26 September 1915. She was commissioned into the German Imperial Navy on 10 February 1916 as SM UB-20. The submarine sank 13 ships in 15 patrols for a total of 10,230 gross register tons (GRT).[5] UB-20 was mined and sunk on 28 July 1917 at 51°21′N 2°38′E / 51.350°N 2.633°E / 51.350; 2.633. Fifteen crew members died in the event.

  1. ^ a b c d e Rössler 1979, p. 64.
  2. ^ Gröner 1991, pp. 23–25.
  3. ^ Helgason, Guðmundur. "WWI U-boat commanders: Max Viebeg (Pour le Mérite)". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 29 January 2015.
  4. ^ Helgason, Guðmundur. "WWI U-boat commanders: Hermann Glimpf". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 29 January 2015.
  5. ^ Bendert 2000, p. 195.


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