SM U-91
History | |
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German Empire | |
Name | U-91 |
Ordered | 23 June 1915 |
Builder | Kaiserliche Werft Danzig |
Yard number | 35 |
Laid down | 1 August 1916 |
Launched | 14 April 1917 |
Commissioned | 17 September 1917 |
Fate | Surrendered to France 26 November 1918, Broken Up at Brest July 1921 |
General characteristics [1] | |
Class and type | Type U 87 submarine |
Displacement | |
Length |
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Beam |
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Height | 9.35 m (30 ft 8 in) |
Draught | 3.88 m (12 ft 9 in) |
Installed power | |
Propulsion | 2 shafts, 2 × 1.66 m (5 ft 5 in) propellers |
Speed |
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Range |
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Test depth | 50 m (160 ft) |
Complement | 4 officers, 32 enlisted |
Armament |
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Service record | |
Part of: |
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Commanders: |
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Operations: | 8 patrols |
Victories: |
SM U-91[Note 1] was one of the 329 submarines serving in the Imperial German Navy in World War I. U-91 was engaged in the naval warfare and took part in the First Battle of the Atlantic.[3]
Design
[edit]Type U 87 submarines were preceded by the shorter Type U 81 submarines. U-91 had a displacement of 757 tonnes (745 long tons) when at the surface and 998 tonnes (982 long tons) while submerged.[1] 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).[1]
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).[1] 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-91 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 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).[1]
Summary of raiding history
[edit]Date | Name | Nationality | Tonnage[Note 2] | Fate[4] |
---|---|---|---|---|
24 December 1917 | Elmleaf | United Kingdom | 5,948 | Damaged |
28 December 1917 | Robert Eggleton | United Kingdom | 2,274 | Sunk |
2 January 1918 | Boston City | United Kingdom | 2,711 | Sunk |
4 January 1918 | Otto | United Kingdom | 139 | Sunk |
5 January 1918 | Knightsgarth | United Kingdom | 2,889 | Sunk |
7 January 1918 | Premier | United Kingdom | 89 | Sunk |
19 February 1918 | Beacon Light | United Kingdom | 2,768 | Sunk |
22 February 1918 | Haileybury | United Kingdom | 2,888 | Sunk |
23 February 1918 | Birchleaf | United Kingdom | 5,873 | Damaged |
23 February 1918 | British Viscount | United Kingdom | 3,287 | Sunk |
24 February 1918 | Renfrew | United Kingdom | 3,830 | Sunk |
2 March 1918 | Bessy | United Kingdom | 60 | Sunk |
20 April 1918 | Florrieston | United Kingdom | 3,366 | Sunk |
21 April 1918 | Landonia | United Kingdom | 2,504 | Sunk |
21 April 1918 | Normandiet | United Kingdom | 1,843 | Sunk |
22 April 1918 | Baron Herries | United Kingdom | 1,610 | Sunk |
26 April 1918 | Ethel | United Kingdom | 100 | Sunk |
27 April 1918 | Gresham | United Kingdom | 3,774 | Sunk |
27 April 1918 | Walpas | Russia | 312 | Sunk |
28 April 1918 | Damao | Portugal | 5,668 | Sunk |
28 April 1918 | Oronsa | United Kingdom | 8,075 | Sunk |
28 April 1918 | Raymond | France | 109 | Sunk |
1 July 1918 | Westmoor | United Kingdom | 4,329 | Sunk |
6 July 1918 | Port Hardy | United Kingdom | 6,533 | Sunk |
9 July 1918 | Silvia | Italy | 3,571 | Sunk |
13 July 1918 | Badagri | United Kingdom | 2,956 | Sunk |
16 July 1918 | Fisherman | United Kingdom | 136 | Sunk |
25 July 1918 | Tippecanoe | United States | 6,187 | Sunk |
1 October 1918 | Therese et Marthe | France | 32 | Sunk |
2 October 1918 | Maia | France | 185 | Sunk |
2 October 1918 | Marie Emmanuel | France | 32 | Sunk |
2 October 1918 | Ave Maris Stella | France | 22 | Sunk |
4 October 1918 | Mercedes | Spain | 2,164 | Sunk |
5 October 1918 | Heathpark | United Kingdom | 2,205 | Sunk |
5 October 1918 | Erindring | United Kingdom | 1,229 | Sunk |
8 October 1918 | Cazengo | Portugal | 3,009 | Sunk |
9 October 1918 | Pierre | France | 354 | Sunk |
11 October 1918 | Luksefjell | Norway | 2,007 | Sunk |
14 October 1918 | Bayard | France | 55 | Sunk |
References
[edit]Notes
[edit]- ^ "SM" stands for "Seiner Majestät" (English: His Majesty's) and combined with the U for Unterseeboot would be translated as His Majesty's Submarine.
- ^ Tonnages are in gross register tons
Citations
[edit]- ^ a b c d e Gröner 1991, pp. 12–14.
- ^ Helgason, Guðmundur. "WWI U-boat commanders: Alfred von Glasenapp (Royal House Order of Hohenzollern)". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 21 January 2015.
- ^ Helgason, Guðmundur. "WWI U-boats: U 91". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 25 January 2010.
- ^ Helgason, Guðmundur. "Ships hit by U 91". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 21 January 2015.
Bibliography
[edit]- 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.