SM U-88

SM U-88[Note 1] was a Type U 87 submarine built for the Imperial German Navy (Kaiserliche Marine) in World War I. U-88 was engaged in the naval warfare and took part in the First Battle of the Atlantic.

For other ships with the same name, see German submarine U-88.

History
German Empire
NameU-88
Ordered23 June 1915
BuilderKaiserliche Werft Danzig
Yard number32
Laid down20 November 1915
Launched22 June 1916
Commissioned7 April 1917
Fate5 September 1917 - Presumably mined off Terschelling. 43 dead (all hands lost)[1]
General characteristics [2]
Class and typeGerman Type U 87 submarine
Displacement
  • 757 t (745 long tons) surfaced
  • 998 t (982 long tons) submerged
Length
Beam
  • 6.20 m (20 ft 4 in) (oa)
  • 4.18 m (13 ft 9 in) (pressure hull)
Height9.35 m (30 ft 8 in)
Draught3.88 m (12 ft 9 in)
Installed power
  • 2 × 2,400 PS (1,765 kW; 2,367 shp) surfaced
  • 2 × 1,200 PS (883 kW; 1,184 shp) submerged
Propulsion2 shafts, 2 × 1.66 m (5 ft 5 in) propellers
Speed
  • 15.6 knots (28.9 km/h; 18.0 mph) surfaced
  • 8.6 knots (15.9 km/h; 9.9 mph) submerged
Range
  • 11,380 nmi (21,080 km; 13,100 mi) at 8 knots (15 km/h; 9.2 mph) surfaced
  • 56 nmi (104 km; 64 mi) at 5 knots (9.3 km/h; 5.8 mph) submerged
Test depth50 m (160 ft)
Complement4 officers, 32 enlisted
Armament
Service record
Part of:
  • III Flotilla
  • 18 May – 5 September 1917[1]
Commanders:
Operations: 4 patrols
Victories:
  • 11 merchant ships sunk
    (33,053 GRT)
  • 1 auxiliary warship sunk
    (6,329 GRT)
  • 2 merchant ships damaged
    (845 GRT)

U-88 is most notable for sinking and taking with her Kapitänleutnant Walther Schwieger, responsible for sinking the RMS Lusitania when he was commander of U-20. The submarine came to an end on 5 September 1917 when she struck a British mine and sank in the North Sea north of Terschelling at 53°57′N 4°55′E. Everyone on board U-88 was killed.[1]

Design

German Type U 87 submarines were preceded by the shorter Type U 81 submarines. U-88 had a displacement of 757 tonnes (745 long tons) when at the surface and 998 tonnes (982 long tons) while submerged.[2] She had a total length of 65.80 m (215 ft 11 in), a pressure hull length of 50.07 m (164 ft 3 in), a beam of 6.20 m (20 ft 4 in), a height of 9.35 m (30 ft 8 in), and a draught of 3.88 m (12 ft 9 in). The submarine was powered by two 2,400 metric horsepower (1,800 kW; 2,400 shp) engines for use while surfaced, and two 1,200 metric horsepower (880 kW; 1,200 shp) engines for use while submerged. She had two propeller shafts. She was capable of operating at depths of up to 50 metres (160 ft).[2]

The submarine had a maximum surface speed of 15.6 knots (28.9 km/h; 18.0 mph) and a maximum submerged speed of 8.6 knots (15.9 km/h; 9.9 mph).[2] When submerged, she could operate for 56 nautical miles (104 km; 64 mi) at 5 knots (9.3 km/h; 5.8 mph); when surfaced, she could travel 11,380 nautical miles (21,080 km; 13,100 mi) at 8 knots (15 km/h; 9.2 mph). U-88 was fitted with four 50 centimetres (20 in) torpedo tubes (two at the bow and two at the stern), ten to twelve torpedoes, one 10.5 cm (4.1 in) SK L/45 deck gun, and probably one 8.8 cm (3.5 in) SK L/30 deck gun. She had a complement of thirty-six (thirty-two crew members and four officers).[2]

Summary of raiding history
Date Name Nationality Tonnage[Note 2] Fate[4]
23 May 1917 Hector  Norway 1,146 Sunk
25 May 1917 HMS Hilary  Royal Navy 6,329 Sunk
28 May 1917 Roma  Russian Empire 417 Damaged
29 May 1917 Ashleaf  United Kingdom 5,768 Sunk
31 May 1917 Jeanne Cordonnier  France 2,194 Sunk
31 May 1917 Miyazaki Maru  Japan 7,892 Sunk
1 June 1917 Cavina  United Kingdom 6,539 Sunk
6 June 1917 Eemdijk  Netherlands 3,048 Sunk
7 June 1917 John Bakke  Norway 1,611 Sunk
29 June 1917 Escondido  Norway 1,066 Sunk
3 July 1917 Iceland  United Kingdom 1,501 Sunk
7 July 1917 Coral Leaf  United Kingdom 428 Damaged
13 July 1917 Ceres  Denmark 1,166 Sunk
16 July 1917 Vesta  Denmark 1,122 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. Helgason, Guðmundur. "WWI U-boats: U 88". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 14 December 2014.
  2. Gröner 1991, pp. 12–14.
  3. Helgason, Guðmundur. "WWI U-boat commanders: Walter Schwieger (Pour le Merite)". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 14 December 2014.
  4. Helgason, Guðmundur. "Ships hit by U 88". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 14 December 2014.

Bibliography
  • 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 0-85177-593-4.
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