SM UB-25

SM UB-25 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 9 October 1915. She was commissioned into the German Imperial Navy on 11 December 1915 as SM UB-25.[Note 1] The submarine was lost in a collision with SMS V26 in Kiel harbour on 17 March 1917. She was raised on 22 March 1917 by the salvage ship SMS Vulcan and served on as a training boat until she was surrendered to Britain in accordance with the requirements of the Armistice with Germany on 26 November 1918. UB-25 was finally broken up in Canning Town in 1922.

For other ships with the same name, see German submarine U-25.
SM UB-25
SM UB-45, a u-boat similar to UB-25
History
German Empire
Ordered: 30 April 1915[1]
Builder: AG Weser, Bremen[1]
Cost: 1,291,000 German Papiermark
Yard number: 239[1]
Launched: 22 November 1915[1]
Commissioned: 11 December 1915
Fate: sunk in accident 19 March 1917
General characteristics [2]
Class and type: German Type UB II submarine
Displacement:
  • 265 t (261 long tons) surfaced
  • 291 t (286 long tons) submerged
Length:
  • 36.13 m (118 ft 6 in) o/a
  • 27.13 m (89 ft) pressure hull
Beam:
  • 4.36 m (14 ft 4 in) o/a
  • 3.85 m (13 ft) pressure hull
Draught: 3.66 m (12 ft)
Propulsion:
Speed:
  • 8.9 knots (16.5 km/h; 10.2 mph) surfaced
  • 5.72 knots (10.59 km/h; 6.58 mph) submerged
Range:
  • 7,200 nmi (13,300 km; 8,300 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 depth: 50 m (160 ft)
Complement: 2 officers, 21 men
Armament:
Notes: 30-second diving time
Service record
Commanders:
  • Oblt.z.S. Hans Nieland[3]
  • 11–24 December 1915
Operations: No patrols
Victories: None

Design

A German Type UB II submarine, UB-25 had a displacement of 265 tonnes (261 long tons) when at the surface and 291 tonnes (286 long tons) while submerged. She had a total length of 36.13 m (118 ft 6 in), a beam of 4.36 m (14 ft 4 in), and a draught of 3.66 m (12 ft 0 in). The submarine was powered by two Benz six-cylinder diesel engines each producing a total 267 metric horsepower (263 shp; 196 kW), a Siemens-Schuckert electric motor producing 210 kilowatts (280 shp; 290 PS), and one propeller shaft. She was capable of operating at depths of up to 50 metres (160 ft).[2]

The submarine had a maximum surface speed of 8.90 knots (16.48 km/h; 10.24 mph) and a maximum submerged speed of 5.72 knots (10.59 km/h; 6.58 mph). When submerged, she could operate for 45 nautical miles (83 km; 52 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 7,200 nautical miles (13,300 km; 8,300 mi) at 5 knots (9.3 km/h; 5.8 mph). UB-25 was fitted with two 50 centimetres (20 in) torpedo tubes, four torpedoes, and one 5 cm (2.0 in) SK L/40 deck gun. She had a complement of twenty-one crew members and two officers and a thirty-second dive time.[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.
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References
  1. Rössler 1979, p. 54.
  2. Gröner 1991, pp. 23-25.
  3. Helgason, Guðmundur. "WWI U-boat commanders: Hans Nieland". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 8 March 2015.

Bibliography
  • Bendert, Harald (2000). Die UB-Boote der Kaiserlichen Marine, 1914-1918. Einsätze, Erfolge, Schicksal (in German). Hamburg: Verlag E.S. Mittler & Sohn GmbH. ISBN 3-8132-0713-7.CS1 maint: ref=harv (link)
  • Gröner, Erich; Jung, Dieter; Maass, Martin (1991). U-boats and Mine Warfare Vessels. German Warships 1815–1945. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4.
  • 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 (in German). I. Munich: Bernard & Graefe. ISBN 3-7637-5213-7.CS1 maint: ref=harv (link)
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