SM UB-51 was a German Type UB III submarine or U-boat in the German Imperial Navy () during World War I. She was commissioned into the Pola Flotilla of the German Imperial Navy on 26 July 1917 as SM UB-51.
She operated as part of the Pola Flotilla based in Cattaro. UB-51 was surrendered 16 January 1919 with the remainder of the Pola Flotilla following orders by Admiral Reinhard Scheer to return to port. UB-51 was later broken up at Swansea.
Construction
UB-51 was ordered by the GIN on 20 May 1916. She was built by Blohm & Voss, Hamburg and following just under a year of construction, launched at Hamburg on 8 March 1917. UB-51 was commissioned later that same year under the command of Kptlt. Ernst Krafft. Like all Type UB III submarines, UB-51 carried 10 torpedoes and was armed with a deck gun. UB-51 would carry a crew of up to 3 officer and 31 men and had a cruising range of . UB-51 had a displacement of while surfaced and when submerged. Her engines enabled her to travel at when surfaced and when submerged.
Summary of raiding history DateNameNationalityTonnageTonnages are in gross register tonsFate30 September 1917Amiral Troude1,876Sunk5 October 1917Forestmoor2,844Sunk12 October 19177,403Sunk17 November 1917Clan Maccorquodale6,517Sunk27 November 1917Tungue8,021Sunk8 February 1918Cimbrier3,905Damaged10 May 1918Szechuen1,862Sunk16 May 1918Mansoura50Sunk18 May 1918Mabrouka25Sunk18 May 1918Tewfig El Bari100Sunk18 May 1918Maria60Sunk18 May 1918Menewar270Sunk18 May 1918Mabrouka25Sunk27 May 1918Leasowe Castle9,737Sunk29 May 1918Missir786Sunk11 July 1918Bacchus2,045Sunk20 July 1918Kosseir1,855Sunk22 July 1918HMT Ijuin257Sunk22 July 1918L 1130Sunk28 July 1918Hyperia3,908Sunk
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