SM UC-54 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 12 January 1916 and was launched on 20 March 1917. She was commissioned into the German Imperial Navy on 10 May 1917 as SM UC-54."SM" stands for "Seiner Majestät" () and combined with the U for Unterseeboot would be translated as His Majesty's Submarine. In eight patrols UC-54 was credited with sinking 18 ships, either by torpedo or by mines laid. UC-54 was scuttled at Trieste on 28 October 1918 on the surrender of Austria-Hungary.
Design A Type UC II submarine, UC-54 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-54 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 DateNameNationalityTonnageMerchant ship tonnages are in gross register tons. Military vessels are listed by tons displacement.Fate4 July 1917Hurstside3,149Sunk12 July 1917Maija164Sunk13 July 1917Loanda141Sunk26 July 1917Roberto Ivens281Sunk7 September 1917Myrmidon4,965Damaged29 January 1918Tosho Maru3,038Sunk2 February 1918Esterel238Sunk2 February 1918Ida63Sunk6 February 19187,263Sunk14 March 1918Ardandearg3,237Sunk27 March 1918Carlo P.61Sunk3 April 1918Sylvie2,148Sunk3 May 1918Pancras4,436Damaged11 May 1918Sant Anna9,350Sunk12 May 1918Vimeira5,884Sunk16 May 1918Marie Frederique245Sunk13 July 1918Ponta Delgada3,381Sunk19 July 1918Australien6,377Sunk19 July 1918Polperro3,365Damaged4 September 1918Arum3,681Sunk23 September 1918Edlington3,864Sunk
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