SM UC-64 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, laid down on 3 April 1916, and was launched on 23 January 1917. She was commissioned into the German Imperial Navy on 22 February 1917 as SM UC-64."SM" stands for "Seiner Majestät" () and combined with the U for Unterseeboot would be translated as His Majesty's Submarine. In 15 patrols UC-64 was credited with sinking 26 ships, either by torpedo or by mines laid. UC-64 was mined and sunk in the Dover Strait on 20 June 1918.
Design A Type UC II submarine, UC-64 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-64 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.Fate20 May 1917Voorwaarts114Sunk23 May 1917Alberdina100Sunk21 June 1917Hendrika109Sunk24 June 1917Telegraaf XVIII306Sunk16 July 1917Timor135Sunk17 August 1917Esperance97Sunk16 September 1917Eendracht VII251Sunk17 September 1917Paraciers2,542Sunk22 September 1917Ville De Valenciennes1,734Sunk18 October 1917Altair1,674Sunk18 October 1917Sten928Sunk16 November 1917Jules Verne157Sunk27 November 1917Ville De Thann1,416Sunk4 December 1917Manchester Mariner4,106Damaged14 December 1917Volnay4,610Sunk19 December 1917Borgsten1,718Sunk19 December 1917Trevelyan3,066Damaged23 December 1917Manicia1,868Damaged20 January 1918Queen Margaret4,972Damaged26 January 1918May24Sunk26 January 1918Rob Roy112Sunk28 March 1918Botha17Sunk28 March 1918Brotherly Love19Sunk28 March 1918Honora29Sunk28 March 1918Noel21Sunk31 March 1918Vianna401Sunk23 April 1918Laurium582Sunk25 April 1918Sote1,353Sunk26 April 1918Llwyngwair1,304Sunk23 May 1918Mefjord720Sunk
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