SM UB-115

SM UB-115 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 28 May 1918 as SM UB-115.[Note 1] She was the only German submarine commissioned with the number 115.

For other ships with the same name, see German submarine U-115.

UB-148 at sea, a U-boat similar to UB-115.
History
German Empire
NameUB-115
Ordered6 / 8 February 1917[1]
BuilderBlohm & Voss, Hamburg
Cost3,714,000 German Papiermark
Yard number321
Launched4 November 1917[2]
Commissioned28 May 1918[2]
FateSunk 29 September 1918 by British warships and aircraft at 55°13′N 1°22′W[2]
General characteristics [2]
Class and typeGerman Type UB III submarine
Displacement
  • 519 t (511 long tons) surfaced
  • 649 t (639 long tons) submerged
Length55.30 m (181 ft 5 in) (o/a)
Beam5.80 m (19 ft)
Draught3.70 m (12 ft 2 in)
Propulsion
Speed
  • 13.3 knots (24.6 km/h; 15.3 mph) surfaced
  • 7.5 knots (13.9 km/h; 8.6 mph) submerged
Range
  • 7,420 nmi (13,740 km; 8,540 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:
Commanders:
  • Oblt.z.S. Reinhold Thomsen[3]
  • 28 May – 29 September 1918
Operations: 2 patrols
Victories: 1 merchant ship sunk
(336 GRT)

UB-115 was sunk by British warships, including HMS Ouse and HMS Star, and the rigid airship R29 at 55°13′N 1°22′W using depth charges and aerial bombs.[2]

Construction
Main article: German Type UB III submarine

She was built by Blohm & Voss of Hamburg and following just under a year of construction, launched at Hamburg on 4 November 1917. UB-115 was commissioned in the spring the next year under the command of Oblt.z.S. Reinhold Thomsen. Like all Type UB III submarines, UB-115 carried 10 torpedoes and was armed with a 8.8 cm (3.46 in) deck gun. UB-115 would carry a crew of up to 3 officer and 31 men and had a cruising range of 7,420 nautical miles (13,740 km; 8,540 mi). UB-115 had a displacement of 519 t (511 long tons) while surfaced and 649 t (639 long tons) when submerged. Her engines enabled her to travel at 13.3 knots (24.6 km/h; 15.3 mph) when surfaced and 7.4 knots (13.7 km/h; 8.5 mph) when submerged.

Fate

On 29 September 1918 while under the command of Reinhold Thomsen, UB-115 was engaged by armed trawlers (amongst others Viola), the airship R29, HMS Ouse and HMS Star. UB-115 was depth charged until destroyed and went down at position 55°14′46″N 1°22′45″W (WGS84), about 4.5 nautical miles (8.3 km; 5.2 mi) northeast of Beacon Point, Newton-by-the-Sea, off Northumberland. All 39 men aboard the submarine died in the attack and sinking.[4] [5]

UB-115's wreck lies in two pieces and is covered in soft corals and an accretion formed from fly ash from a local power plant.[4]

Summary of raiding history
Date Name Nationality Tonnage[Note 2] Fate[6]
21 September 1918 Staithes  United Kingdom 336 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. 66.
  2. Gröner 1991, pp. 25–30.
  3. Helgason, Guðmundur. "WWI U-boat commanders: Reinhold Thomsen". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 10 March 2015.
  4. Helgason, Guðmundur. "WWI U-boat commanders: UB 115". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 29 September 2010.
  5. MHSC. "Viola-Dias, War, Distant Waters and the Hull Fishing Industry in Both World Wars" (PDF). MHSC Maritime Historical Studies Centre. University of Hull. Archived from the original (PDF) on 18 March 2009. Retrieved 3 March 2009.
  6. Helgason, Guðmundur. "Ships hit by UB 115". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 10 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.
  • Gröner, Erich; Jung, Dieter; Maass, Martin (1991). German Warships 1815–1945, U-boats and Mine Warfare Vessels. Vol. 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. ISBN 3-7637-5213-7. {{cite book}}: |work= ignored (help)


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