History | |
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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]
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]
Date | Name | Nationality | Tonnage [Note 2] | Fate [4] |
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24 December 1917 | Elmleaf | ![]() | 5,948 | Damaged |
28 December 1917 | Robert Eggleton | ![]() | 2,274 | Sunk |
2 January 1918 | Boston City | ![]() | 2,711 | Sunk |
4 January 1918 | Otto | ![]() | 139 | Sunk |
5 January 1918 | Knightsgarth | ![]() | 2,889 | Sunk |
7 January 1918 | Premier | ![]() | 89 | Sunk |
19 February 1918 | Beacon Light | ![]() | 2,768 | Sunk |
22 February 1918 | Haileybury | ![]() | 2,888 | Sunk |
23 February 1918 | Birchleaf | ![]() | 5,873 | Damaged |
23 February 1918 | British Viscount | ![]() | 3,287 | Sunk |
24 February 1918 | Renfrew | ![]() | 3,830 | Sunk |
2 March 1918 | Bessy | ![]() | 60 | Sunk |
20 April 1918 | Florrieston | ![]() | 3,366 | Sunk |
21 April 1918 | Landonia | ![]() | 2,504 | Sunk |
21 April 1918 | Normandiet | ![]() | 1,843 | Sunk |
22 April 1918 | Baron Herries | ![]() | 1,610 | Sunk |
26 April 1918 | Ethel | ![]() | 100 | Sunk |
27 April 1918 | Gresham | ![]() | 3,774 | Sunk |
27 April 1918 | Walpas | ![]() | 312 | Sunk |
28 April 1918 | Damao | ![]() | 5,668 | Sunk |
28 April 1918 | Oronsa | ![]() | 8,075 | Sunk |
28 April 1918 | Raymond | ![]() | 109 | Sunk |
1 July 1918 | Westmoor | ![]() | 4,329 | Sunk |
6 July 1918 | Port Hardy | ![]() | 6,533 | Sunk |
9 July 1918 | Silvia | ![]() | 3,571 | Sunk |
13 July 1918 | Badagri | ![]() | 2,956 | Sunk |
16 July 1918 | Fisherman | ![]() | 136 | Sunk |
25 July 1918 | Tippecanoe | ![]() | 6,187 | Sunk |
1 October 1918 | Therese et Marthe | ![]() | 32 | Sunk |
2 October 1918 | Maia | ![]() | 185 | Sunk |
2 October 1918 | Marie Emmanuel | ![]() | 32 | Sunk |
2 October 1918 | Ave Maris Stella | ![]() | 22 | Sunk |
4 October 1918 | Mercedes | ![]() | 2,164 | Sunk |
5 October 1918 | Heathpark | ![]() | 2,205 | Sunk |
5 October 1918 | Erindring | ![]() | 1,229 | Sunk |
8 October 1918 | Cazengo | ![]() | 3,009 | Sunk |
9 October 1918 | Pierre | ![]() | 354 | Sunk |
11 October 1918 | Luksefjell | ![]() | 2,007 | Sunk |
14 October 1918 | Bayard | ![]() | 55 | Sunk |
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