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German submarine U-821
German submarine ''U-821'' was a short-lived Type VIIC U-boat of Nazi Germany's ''Kriegsmarine'', built by Oderwerke in Stettin during World War II for service in the Battle of the Atlantic. She only participated in two brief combat patrols, one of which ended after four days when she was sunk by allied aircraft. ''U-821'' was built in Stettin at a small shipyard, and thus took eighteen months to complete, being ready by October 1943. The boat was of the VIIC Type, which possessed long range cruising capabilities as well as five torpedo tubes.
==Design==
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. ''U-821'' 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 Brown, Boveri & Cie GG UB 720/8 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-821'' 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）』
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