SM UC-43 was a German Type UC II minelaying submarine or U-boat in the German Imperial Navy () during World War I. The U-boat was ordered on 20 November 1915 and was launched on 5 October 1916. She was commissioned into the German Imperial Navy on 25 October 1916 as SM UC-43. In two patrols UC-43 was credited with sinking 13 ships, either by torpedo or by mines laid. UC-43 was torpedoed and sunk by north of Muckle Flugga on 10 March 1917.
Design A Type UC II submarine, UC-43 had a displacement of when at the surface and while submerged. She had a length overall of , a beam of , and a draught of . The submarine was powered by two six-cylinder four-stroke diesel engines each producing (a total of ), two electric motors producing , and two propeller shafts. She had a dive time of 48 seconds and was capable of operating at a depth of .
The submarine had a maximum surface speed of and a submerged speed of . When submerged, she could operate for at ; when surfaced, she could travel at . UC-43 was fitted with six mine tubes, eighteen UC 200 mines, three torpedo tubes (one on the stern and two on the bow), seven torpedoes, and one Uk L/30 deck gun. Her complement was twenty-six crew members.
Summary of raiding history DateNameNationalityTonnageTonnages are in gross register tonsFate31 December 1916Lupus539Captured as prize12 January 1917Brentwood1,192Sunk15 January 1917Brabant1,492Sunk15 January 1917Graafjeld728Sunk20 January 1917Planudes542Sunk27 February 1917Marie Madeleine45Sunk1 March 1917Mabella1,637Sunk1 March 1917Storenes1,870Sunk6 March 1917Cornelia903Sunk6 March 1917Sawa Maru2,578Sunk7 March 1917Baron Wemyss1,605Sunk9 March 1917Laurits183Sunk13 March 1917Norwegian6,237Sunk22 March 1917Malmanger5,672Sunk
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