SM UB-21

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For other ships of the same name, see German submarine U-21.
SM UB 45.jpg
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[edit]

  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[edit]

  1. ^ a b c d e Rössler 1979, p. 64.
  2. ^ a b c d e f g h i j k l m n o p q r s Gröner 1985, p. 50.
  3. ^ Bendert 2000, p. 195.

Bibliography[edit]