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German Type U 81 submarine
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German Type U 81 submarine : ウィキペディア英語版
German Type U 81 submarine

Type 81 was a class of U-boats built during World War I by the Kaiserliche Marine.
Type 81 U-boats carried 12 torpedoes and had various arrangements of deck guns. U 81 to U 83 had one deck gun with 140-240 rounds. U 84 - U 86 were constructed with two deck guns. In 1917, U 84 - U 86 were converted to a carry one 10.5 cm and one 8.8 cm deck gun and carried 240 rounds.
They carried a crew of four officers and 31 men and had excellent seagoing abilities with a cruising range of around . Many arrangements from the Type 81 and the next two types were also seen on the World War II Type IX U-boats when their design work took place 20 years later.
Compared to the previous type 63, the 81s were longer, while the pressure hull remained the same. They were faster on the surface, and faster submerged and increased range by to 11,200  nmi at 8 knots. They carried 12 torpedoes instead of 6, and by 1917 all type 87s had the larger 10.5 cm deck gun versus the twin 8.8 cm on the 63s. Crew size was decreased by 1 to 35.
Compared to the following type 87, the 81s were longer, yet 5 tons lighter.〔 Their range was 180 miles shorter, but speed was faster on the surface and faster submerged. The most significant difference was the addition of 4 more torpedoes and 2 additional bow tubes on the type 87. Type 87 also got the additional crew member back and numbered 36 again.
Type 81 boats were responsible for sinking 3.537% of all allied shipping sunk during the war, taking a total of . They also damaged , and captured .
== References ==


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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