SM UB-21

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SM UB-45 a u-boat similar to UB-21
Career (German Empire)
Name: UB-21
Ordered: 30 April 1915[1]
Builder: Blohm & Voss, Hamburg[1]
Yard number: 251[1]
Launched: 26 September 1915[1]
Completed: 18 February 1916[1]
Commissioned: 20 February 1916[2]
Fate: sunk 1920[2]
General characteristics
Class & type: German Type UB II submarine
Displacement: 263 t (259 long tons) surfaced[2]
292 t (287 long tons) submerged[2]
Length: 36.13 m (118 ft 6 in)[2]
Beam: 436 m (1,430 ft 5 in)[2]
Draft: 3.7 m (12 ft 2 in)[2]
Propulsion: 2 × propeller shafts
2 ×Körting diesel engines, 284 shp (212 kW)[2]
2 ×Siemens-Schuckert electric motor, 280 shp (210 kW)[2]
Speed: 9.15 knots (16.95 km/h) surfaced[2]
5.81 knots (10.76 km/h) submerged[2]
Range: 6,450 nautical miles (11,950 km; 7,420 mi) at 5 knots (9.3 km/h; 5.8 mph) surfaced[2]
45 nmi (83 km; 52 mi) at 4 knots submerged[2]
Test depth: 50 m (160 ft)[2]
Complement: 2 officers, 21 men[2]
Armament: 2 × 50 cm (19.7 in) torpedo tubes[2]
4 × torpedoes (later 6)
1 × 5 cm SK L/40 gun[2]
Notes: 45-second diving time[2]

SM UB-21 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 20 February 1916 as SM UB-21.[Note 1] The submarine sank 35 ships in 26 patrols for a total of 39,478 gross register tons (GRT).[3] Surrendered to Britain in accordance with the requirements of the Armistice with Germany, UB-21 was lost in 1920 off the British East coast while en route to be broken up.[2]

Notes

  1. "SM" stands for "Seiner Majestät" (English: His Majesty's) and combined with the U for Unterseeboot would be translated as His Majesty's Submarine.

References

  1. 1.0 1.1 1.2 1.3 1.4 Rössler 1979, p. 64.
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 2.12 2.13 2.14 2.15 2.16 2.17 2.18 Gröner 1985, p. 50.
  3. Bendert 2000, p. 195.

Bibliography

  • Gröner, Erich (1985). "U-Boote, Hilfskreuzer, Minenschiffe, Netzleger, Sperrbrecher". Die deutschen Kriegsschiffe, 1815-1945 III (Koblenz: Bernhard&Graefe). ISBN 3-7637-4802-4. 
  • Bendert, Harald (2000). Die UB-Boote der Kaiserlichen Marine, 1914-1918. Einsätze, Erfolge, Schicksal. Hamburg: Verlag E.S. Mittler & Sohn GmbH. ISBN 3-8132-0713-7. 
  • Rössler, Eberhard (1979). "U-Bootbau bis Ende des 1. Weltkrieges, Konstruktionen für das Ausland und die Jahre 1935 - 1945". Die deutschen U-Boote und ihre Werften I (Munich: Bernhard&Graefe). ISBN 3-7637-5213-7. 



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