SM ''UC-40'' was a German German Type UC II submarine, Type UC II minelayer, minelaying submarine or U-boat in the German Imperial Navy (german: Kaiserliche Marine) during World War I. The U-boat was ordered on 20 November 1915 and was Ceremonial ship launching, launched on 5 September 1916. She was Ship commissioning, commissioned into the German Imperial Navy on 1 October 1916 as SM ''UC-40''."SM" stands for "Seiner Majestät" ( en, His Majesty's) and combined with the ''U'' for ''Unterseeboot'' would be translated as ''His Majesty's Submarine''. In 17 patrols ''UC-40'' was credited with sinking 30 ships, either by torpedo or by naval mines, mines laid. ''UC-40'' was being taken to surrender but foundered in the North Sea en route on 21 January 1919.

Design

A German Type UC II submarine, ''UC-40'' had a displacement of when at the surface and while submerged. She had a length overall of , a beam (ship), beam of , and a draught (ship), 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-40'' 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 8.8 cm SK L/30 naval gun, Uk L/30 deck gun. Her Ship's company, complement was twenty-six crew members.

Summary of raiding history

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* * * * {{DEFAULTSORT:Uc040 Ships built in Hamburg German Type UC II submarines U-boats commissioned in 1916 U-boats sunk in 1919 Maritime incidents in 1919 World War I minelayers of Germany World War I shipwrecks in the North Sea World War I submarines of Germany 1916 ships