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German submarine ''U-257'' was a Type VIIC U-boat of Nazi Germany's ''Kriegsmarine'' during World War II. She was laid down at the Bremer Vulkan yard at Bremen-Vegesack on 22 February 1941 as yard number 22. She was launched on 19 November and commissioned on 14 January 1942 under the command of ''Kapitänleutnant'' Heinz Rahe. ''U-257'' was assigned to the 5th U-Boat Flotilla for training, then transferred to the 3rd U-boat Flotilla for operational service. She was sunk by Allied warships in mid-Atlantic in February 1944. ==Design== German Type VIIC submarines were preceded by the shorter Type VIIB submarines. ''U-257'' 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-257'' 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. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「German submarine U-257」の詳細全文を読む スポンサード リンク
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