SM U-89
Introduction '''SM ''U-89''''' was one of the 329 submarines serving in the Imperial German Navy in World War I. ''U-89'' was engaged in the naval warfare and took part in the First Battle of the Atlantic. On 12 February 1918, ''U-89'' was rammed and sunk by  off Malin Head. There were no survivors.
Design German Type U 87 submarines were preceded by the shorter Type U 81 submarines. ''U-89'' 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-89'' 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 DateNameNationalityTonnageFate2 October 1917''Trafaria''1,744Sunk3 October 1917''Baron Blantyre''1,844Sunk6 October 1917''Victorine''1,241Sunk12 December 1917''Reine D'arvor''324Damaged21 December 1917''Boa Vista''3,667Sunk
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