SM UC-39 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 25 June 1916. She was commissioned into the German Imperial Navy on 31 October 1916 as SM UC-39."SM" stands for "Seiner Majestät" () and combined with the U for Unterseeboot would be translated as His Majesty's Submarine. In one patrol, UC-39 was credited with sinking three ships, either by torpedo or by mines laid. UC-39 was forced to the surface by a depth charge attack and then sunk by gunfire from the British destroyer off Flamborough Head on 8 February 1917. Seven crew members died while 17 survived.
Design A Type UC II submarine, UC-39 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 35 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-39 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.Fate7 February 1917Hans Kinck2,667Sunk8 February 1917Hanna Larsen1,311Sunk8 February 1917Ida1,172Sunk
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