SM UB-115

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For other ships of the same name, see German submarine U-115.
UB 148 at sea 2.jpeg
UB-148 at sea, a U-boat similar to UB-115.
Career (German Empire)
Name: UB-115
Ordered: 6/8 February 1917[1]
Builder: Blohm & Voss, Hamburg[2]
Cost: 3,714,000 German Papiermark[2]
Yard number: 321[2]
Launched: 4 November 1917[3]
Commissioned: 28 May 1918[3]
Fate: Sunk 29 September 1918 by British warships and aircraft at 55°13′N 1°22′W / 55.217°N 1.367°W / 55.217; -1.367Coordinates: 55°13′N 1°22′W / 55.217°N 1.367°W / 55.217; -1.367.[3]
General characteristics
Class and type: German Type UB III submarine
Type: Coastal submarine
Displacement: 519 t (511 long tons; 572 short tons) surfaced
649 t (639 long tons; 715 short tons) submerged[2]
Length: 55.3 m (181 ft) o/a[2]
Beam: 5.8 m (19 ft)[2]
Draught: 3.7 m (12 ft)[2]
Propulsion: 2 shafts
6-cylinder MAN-Vulcan diesel engines,[4] 1,100 ihp (820 kW)
AEG[4] electric motors, 788 ihp (588 kW)[2]
Speed: 13.3 knots (24.6 km/h; 15.3 mph) surfaced
7.5 knots (13.9 km/h; 8.6 mph) submerged[2]
Range: 7,420 nmi (13,740 km; 8,540 mi) at 6 kn (11 km/h; 6.9 mph) surfaced
55 nmi (102 km; 63 mi) at 4 kn (7.4 km/h; 4.6 mph) submerged[2]
Test depth: 50 m (160 ft)[4]
Complement: 3 officers, 31 men[4]
Armament: • 5 × 50 cm (19.7 in) torpedo tubes (4 bow, 1 stern) with 10 torpedoes
• 1 × 10.5 cm (4.13 in) deck gun[4]
Service record
Part of: Flanders Flotilla
3 Sep 1918 – 29 Sep 1918
Commanders: Oblt Reinhold Thomsen[5]
28 May 1918 – 29 Sep 1918
Operations: 2 patrols
Victories: 1 merchant ship sunk (336 GRT)

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.[nb 1] She was the only German submarine commissioned with the number 115.

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 / 55.217°N 1.367°W / 55.217; -1.367 using depth charges and aerial bombs.[3]

Construction[edit]

She was built by Blohm & Voss of Hamburg[2] 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 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).[2] UB-115 had a displacement of 519 t (511 long tons; 572 short tons) while surfaced and 649 t (639 long tons; 715 short 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.[2]

Fate[edit]

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 / 55.24611°N 1.37917°W / 55.24611; -1.37917 (WGS84), about 4.5 nautical miles (8.3 km) northeast of Beacon Point, Newton-by-the-Sea, off Northumberland. All 39 men aboard the submarine died in the attack and sinking.[6][7]

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.[6]

Summary of Raiding Career[edit]

Date Name Nationality Tonnage
(GRT)
Fate[8]
21 September 1918 Staithes  United Kingdom 336 Sunk

Notes[edit]

Footnotes
  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.
Citations
  1. ^ Rössler 1979, p. 66.
  2. ^ a b c d e f g h i j k l m Gröner 1985, p. 52.
  3. ^ a b c d Gröner 1985, p. 55.
  4. ^ a b c d e Gröner 1985, p. 53.
  5. ^ "Reinhold Thomsen". Uboat.net. Retrieved 10 March 2015. 
  6. ^ a b "UB-115 - U-boats of World War I". uboat.net. Retrieved 29 September 2010. 
  7. ^ MHSC. "Viola-Dias, War, Distant Waters and the Hull Fishing Industry in Both World Wars" (PDF). MHSC Maritime Historical Studies Centre. University of Hull. Retrieved 3 March 2009. 
  8. ^ "SM UB-115 successes". UBoat.net. Retrieved 10 March 2015. 

References[edit]