SM UC-33 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 29 August 1915 and was launched on 26 August 1916. She was commissioned into the German Imperial Navy on 25 September 1916 as SM UC-33."SM" stands for "Seiner Majestät" () and combined with the U for Unterseeboot would be translated as His Majesty's Submarine. In seven patrols UC-33 was credited with sinking 36 ships, either by torpedo or by mines laid. UC-33 was shelled and then rammed by patrol boat PC61 captained by Frank Worsley at position in St. George's Channel on 26 September 1917.
Design A Type UC II submarine, UC-33 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-33 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.Fate8 February 1917Derika153Sunk14 February 1917Eudora1,991Sunk18 February 1917HMT Clifton242Sunk24 February 1917HMY Verona437Sunk14 April 1917Hermione4,011Sunk20 April 1917HMT Loch Eye225Sunk21 April 1917Jedburgh165Sunk21 April 1917Yeovil164Sunk5 May 1917Lodes396Sunk23 May 1917Beinir73Sunk23 May 1917Britannia69Sunk23 May 1917Else78Sunk23 May 1917Margrethe104Sunk23 May 1917Olearia209Sunk23 May 1917Sisapon211Sunk23 May 1917Streymoy81Sunk24 May 1917Brestir69Sunk24 May 1917Isabella Innes37Sunk24 May 1917Traveller76Sunk25 May 1917A. H. Friis110Sunk25 May 1917Glyg358Sunk25 May 1917Whinlatter1,378Sunk28 June 1917Corona48Sunk29 June 1917Gem79Sunk29 June 1917Manx Princess87Sunk30 June 1917370Sunk30 June 1917Germania1,064Sunk1 July 1917Ariel108Sunk2 July 1917General Buller72Sunk2 July 1917Hamnavoe57Sunk6 July 1917Handel en Visscherij76Sunk6 July 1917Piet Hein100Sunk6 July 1917Skjald477Sunk7 July 1917HMD Southesk93Sunk13 August 1917Akassa3,919Sunk19 August 1917Spectator3,808Sunk26 September 1917San Zeferino6,430Damaged
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