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.[1] On 12 February 1918, U-89 was rammed and sunk by off Malin Head. There were no survivors.
Type U 87 submarines were preceded by the shorter Type U 81 submarines. U-89 had a displacement of 757t when at the surface and 998t while submerged. She had a total length of 65.8m (215.9feet), a pressure hull length of 50.07m (164.27feet), a beam of 6.2m (20.3feet), a height of 9.35m (30.68feet), and a draught of 3.88m (12.73feet). The submarine was powered by two 2400PS engines for use while surfaced, and two 1200PS 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 10.5sp=usNaNsp=us SK L/45 deck gun, and one 8.8sp=usNaNsp=us SK L/30 deck gun. She had a complement of thirty-six (thirty-two crew members and four officers).
| Date | Name | Nationality | Tonnage[2] | Fate[3] | |
|---|---|---|---|---|---|
| 2 October 1917 | Trafaria |  Portugal | 1,744 | Sunk | |
| 3 October 1917 | Baron Blantyre |  United Kingdom | 1,844 | Sunk | |
| 6 October 1917 | Victorine |  France | 1,241 | Sunk | |
| 12 December 1917 | Reine D'arvor | France | 324 | Damaged | |
| 21 December 1917 | Boa Vista | Portugal | 3,667 | Sunk |