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German submarine U-309
German submarine ''U-309'' was a Type VIIC U-boat of Nazi Germany's ''Kriegsmarine'' during World War II. The submarine was laid down on 24 January 1942 at the Flender Werke yard at Lübeck, launched on 5 December 1942, and commissioned on 27 January 1943 under the command of ''Oberleutnant zur See'' Hans-Gert Mahrholz. She sailed on nine combat patrols, but damaged only one ship, before being sunk off Scotland on 16 February 1945.〔
==Design==
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. ''U-309'' 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 Garbe, Lahmeyer & Co. RP 137/c 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-309'' 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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