SM U-84
Introduction '''SM ''U-84''''' was one of the 329 submarines serving in the Imperial German Navy (Kaiserliche Marine) in World War I. ''U-84'' was engaged in the naval warfare and took part in the First Battle of the Atlantic.Initially ''U-81'' to ''U-83'' had one 10.5 cm gun with 140-240 rounds. ''U-84'' - ''U-86'' on the other hand had two 8.8 cm guns. In 1917 ''U-84'' - ''U-86'' were refitted with a single 10.5 cm gun (240 rounds)
Design German Type U 81 submarines were preceded by the shorter Type UE I submarines. ''U-84'' 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-84'' was fitted with four  torpedo tubes (two at the bow and two at the stern), twelve to sixteen torpedoes, and one  SK L/45 deck gun. She had a complement of thirty-five (thirty-one crew members and four officers).
Summary of raiding history DateNameNationalityTonnageFate14 December 1916''Aamot''1,362Captured as prize18 December 1916''Malcolm''2,100Captured as prize9 January 1917''Alexandrian''4,467Damaged10 January 1917''Bergenhus''3,606Sunk12 January 1917''Auchencrag''3,916Sunk15 January 1917''Kinpurney''1,944Sunk15 January 1917''Omsk''1,574Sunk20 January 1917''Bulgarian''2,515Sunk20 January 1917''Neuquen''3,583Sunk17 February 1917''Bayonne''2,589Sunk17 February 1917''Romsdalen''2,548Sunk18 February 191711,137Damaged18 February 1917''Hunsworth''2,991Damaged18 February 1917''Juno''2,416Sunk18 February 1917''Valdes''2,233Sunk21 February 1917''Dukat''1,408Sunk22 February 1917''Invercauld''1,416Sunk13 April 1917''Argyll''3,547Sunk13 April 1917''Lime Branch''5,379Damaged18 April 1917''Cragoswald''3,235Sunk18 April 1917''Rowena''3,017Sunk19 April 1917''Elswick Manor''3,943Sunk20 April 1917''Malakand''7,653Sunk1 July 1917''Bachi''2,184Sunk1 July 1917''Demerara''11,484Damaged4 July 1917''Goathland''3,044Sunk7 July 1917''Condesa''8,557Sunk7 July 1917''Oxø''831Sunk12 August 1917''Ursus Minor''623Sunk13 August 19171,290Sunk24 November 1917''Actaeon''4,999Sunk1 December 1917''Antonios Stathatos''2,743Sunk2 December 1917''Birchgrove''2,821Sunk9 January 1918''Bayvoe''2,979Sunk10 January 1918''Cardiff''2,808Damaged11 January 1918''Mereddio''3,069Sunk12 January 1918''Chateau Laffite''1,913Sunk17 January 1918''Messidor''3,883Damaged
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