SM U-91 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.
Design Type U 87 submarines were preceded by the shorter Type U 81 submarines. U-91 had a displacement of when at the surface and while submerged. She had a total length of , a pressure hull length of , a beam of , a height of , and a draught of . The submarine was powered by two engines for use while surfaced, and two engines for use while submerged. She had two propeller shafts. She was capable of operating at depths of up to .
The submarine had a maximum surface speed of and a maximum submerged speed of . When submerged, she could operate for at ; when surfaced, she could travel at . U-91 was fitted with four torpedo tubes (two at the bow and two at the stern), ten to twelve torpedoes, one SK L/45 deck gun, and one SK L/30 deck gun. She had a complement of thirty-six (thirty-two crew members and four officers).
Summary of raiding history DateNameNationalityTonnageTonnages are in gross register tonsFate24 December 1917Elmleaf5,948Damaged28 December 1917Robert Eggleton2,274Sunk2 January 1918Boston City2,711Sunk4 January 1918Otto139Sunk5 January 1918Knightsgarth2,889Sunk7 January 1918Premier89Sunk19 February 1918Beacon Light2,768Sunk22 February 1918Haileybury2,888Sunk23 February 1918Birchleaf5,873Damaged23 February 1918British Viscount3,287Sunk24 February 1918Renfrew3,830Sunk2 March 1918Bessy60Sunk20 April 1918Florrieston3,366Sunk21 April 1918Landonia2,504Sunk21 April 1918Normandiet1,843Sunk22 April 1918Baron Herries1,610Sunk26 April 1918Ethel100Sunk27 April 1918Gresham3,774Sunk27 April 1918Walpas312Sunk28 April 1918Damao5,668Sunk28 April 1918Oronsa8,075Sunk28 April 1918Raymond109Sunk1 July 1918Westmoor4,329Sunk6 July 1918Port Hardy6,533Sunk9 July 1918Silvia3,571Sunk13 July 1918Badagri2,956Sunk16 July 1918Fisherman136Sunk25 July 1918Tippecanoe6,187Sunk1 October 1918Therese et Marthe32Sunk2 October 1918Maia185Sunk2 October 1918Marie Emmanuel32Sunk2 October 1918Ave Maris Stella22Sunk4 October 1918Mercedes2,164Sunk5 October 1918Heathpark2,205Sunk5 October 1918Erindring1,229Sunk8 October 1918Cazengo3,009Sunk9 October 1918Pierre354Sunk11 October 1918Luksefjell2,007Sunk14 October 1918Bayard55Sunk
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