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 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).
Previously recorded fate U-84 was originally though to have been rammed, depth charged and sunk by PC62 in St George's Channel and sunk at .
Summary of raiding history DateNameNationalityTonnageMerchant ship tonnages are in gross register tons. Military vessels are listed by tons displacement.Fate14 December 1916Aamot1,362Captured as prize18 December 1916Malcolm2,100Captured as prize9 January 1917Alexandrian4,467Damaged10 January 1917Bergenhus3,606Sunk12 January 1917Auchencrag3,916Sunk15 January 1917Kinpurney1,944Sunk15 January 1917Omsk1,574Sunk20 January 1917Bulgarian2,515Sunk20 January 1917Neuquen3,583Sunk17 February 1917Bayonne2,589Sunk17 February 1917Romsdalen2,548Sunk18 February 191711,137Damaged18 February 1917Hunsworth2,991Damaged18 February 1917Juno2,416Sunk18 February 1917Valdes2,233Sunk21 February 1917Dukat1,408Sunk22 February 1917Invercauld1,416Sunk13 April 1917Argyll3,547Sunk13 April 1917Lime Branch5,379Damaged18 April 1917Cragoswald3,235Sunk18 April 1917Rowena3,017Sunk19 April 1917Elswick Manor3,943Sunk20 April 1917Malakand7,653Sunk1 July 1917Bachi2,184Sunk1 July 1917Demerara11,484Damaged4 July 1917Goathland3,044Sunk7 July 1917Condesa8,557Sunk7 July 1917Oxø831Sunk12 August 1917Ursus Minor623Sunk13 August 19171,290Sunk24 November 1917Actaeon4,999Sunk1 December 1917Antonios Stathatos2,743Sunk2 December 1917Birchgrove2,821Sunk9 January 1918Bayvoe2,979Sunk10 January 1918Cardiff2,808Damaged11 January 1918Mereddio3,069Sunk12 January 1918Chateau Laffite1,913Sunk17 January 1918Messidor3,883Damaged
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