SM UB-90

SM UB-90 was a German Type UB III submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. She was commissioned into the German Imperial Navy on 21 March 1918 as SM UB-90.[Note 1]

For other ships with the same name, see German submarine U-90.
UB-148 at sea, a U-boat similar to UB-90.
History
German Empire
NameUB-90
Ordered6 / 8 February 1917[1]
BuilderAG Vulcan, Hamburg
Cost3,654,000 German Papiermark
Yard number106
Launched12 February 1918[2]
Commissioned21 March 1918[2]
FateSunk 16 October 1918 by British submarine[2]
General characteristics [2]
Class and typeGerman Type UB III submarine
Displacement
  • 510 t (500 long tons) surfaced
  • 640 t (630 long tons) submerged
Length55.52 m (182 ft 2 in) (o/a)
Beam5.76 m (18 ft 11 in)
Draught3.73 m (12 ft 3 in)
Propulsion
Speed
  • 13 knots (24 km/h; 15 mph) surfaced
  • 7.4 knots (13.7 km/h; 8.5 mph) submerged
Range
  • 7,120 nmi (13,190 km; 8,190 mi) at 6 knots (11 km/h; 6.9 mph) surfaced
  • 55 nmi (102 km; 63 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth50 m (160 ft)
Complement3 officers, 31 men[2]
Armament
Service record
Part of:
  • II Flotilla
  • 29 June – 16 October 1918
Commanders:
  • Oblt.z.S. Gottfried von Mayer[3]
  • 21 March – 16 October 1918
Operations: 2 patrols
Victories:
  • 1 merchant ship sunk
    (3,575 GRT)
  • 1 merchant ship taken as prize
    (850 GRT)

On 16 October 1918, UB-90 was hit by a torpedo from HMS L12 at 57°55′N 10°27′E and sunk. All 38 crew members died in the event.[2]

Construction
Main article: German Type UB III submarine

She was built by AG Vulcan of Hamburg and following just under a year of construction, launched at Hamburg on 12 February 1918. UB-90 was commissioned early the next year under the command of Oblt.z.S. Gottfried von Mayer. Like all Type UB III submarines, UB-90 carried 10 torpedoes and was armed with a 10.5 cm (4.13 in) deck gun. UB-90 would carry a crew of up to 3 officer and 31 men and had a cruising range of 7,120 nautical miles (13,190 km; 8,190 mi). UB-90 had a displacement of 510 t (500 long tons) while surfaced and 640 t (630 long tons) when submerged. Her engines enabled her to travel at 13 knots (24 km/h; 15 mph) when surfaced and 7.4 knots (13.7 km/h; 8.5 mph) when submerged.

Summary of raiding history
Date Name Nationality Tonnage[Note 2] Fate[4]
29 July 1918 Douro  Denmark 850 Captured as prize
3 October 1918 Eupion  United Kingdom 3,575 Sunk

References

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.
  2. Tonnages are in gross register tons

Citations
  1. Rössler 1979, p. 61.
  2. Gröner 1991, pp. 25–30.
  3. Helgason, Guðmundur. "WWI U-boat commanders: Gottfried von Mayer". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 8 February 2015.
  4. Helgason, Guðmundur. "Ships hit by UB 90". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 8 February 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 978-3-8132-0713-2.
  • Gröner, Erich; Jung, Dieter; Maass, Martin (1991). U-boats and Mine Warfare Vessels. German Warships 1815–1945. Vol. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 978-0-85177-593-7.
  • Rössler, Eberhard (1979). U-Bootbau bis Ende des 1. Weltkrieges, Konstruktionen für das Ausland und die Jahre 1935 – 1945. ISBN 978-3-7637-5213-3. {{cite book}}: |work= ignored (help)

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