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German submarine U-731
German submarine ''U-731'' was a Type VIIC U-boat of Nazi Germany's ''Kriegsmarine'' during World War II. The submarine was laid down on 1 October 1941 at the Schichau-Werke yard at Danzig, launched on 25 July 1942, and commissioned on 3 October 1942 under the command of ''Oberleutnant zur See'' Werner Techand.
Attached to ''8th U-boat Flotilla'' based at Kiel, ''U-731'' completed her training period on 30 April 1943 and was assigned to front-line service.
==Design==
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. ''U-731'' had a displacement of when at the surface and while submerged. She had a total length of , a pressure hull length of , a beam of , a height of , and a draught of . The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of for use while surfaced, two AEG GU 460/8–27 double-acting electric motors producing a total of for use while submerged. She had two shafts and two propellers. The boat was capable of operating at depths of up to .
The submarine had a maximum surface speed of and a maximum submerged speed of . When submerged, the boat could operate for at ; when surfaced, she could travel at . ''U-731'' was fitted with five torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one , 220 rounds, and an anti-aircraft gun. The boat had a complement of between forty-four and sixty.
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