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The United States N-class submarines were a class of seven coastal defense submarines built for the United States Navy during World War I. ==Description== The boats were constructed by two companies to slightly different specifications; ''N-1'', ''N-2'', and ''N-3'' were designed by the Electric Boat Company of Groton, Connecticut and built by the Seattle Construction and Drydock Company of Seattle, Washington, and ''N-4'', ''N-5'', ''N-6'', and ''N-7'' were designed and built by the Lake Torpedo Boat Company of Bridgeport, Connecticut. The N-boats built by Lake are sometimes considered a separate class. The Electric Boat submarines had a length of overall, a beam of and a mean draft of . They displaced on the surface and submerged. The N-class submarines had a crew of 2 officers and 23 enlisted men. They had a diving depth of .〔Friedman, p. 307〕 The Lake submarines had a length of overall, a beam of and a mean draft of . They displaced on the surface and submerged. The N-class submarines had a crew of 3 officers and 26 enlisted men. They also had a diving depth of .〔 For surface running, the Electric Boat submarines were powered by two diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a electric motor. The Lake boats had diesels and motors. Regardless of designer, the N-class submarines could reach on the surface and underwater.〔 On the surface, the boats had a range of at and at submerged.〔 The boats were armed with four torpedo tubes in the bow. They carried four reloads, for a total of eight torpedoes. They were the last submarines to be designed without a deck gun until 1946.〔Gardiner & Gray, p. 129〕 This class was the first US Navy submarine class completed with metal bridge shields. These had been omitted from previous classes to increase underwater speed. These classes used piping-and-canvas temporary bridges for extended surface runs; these were found to be inadequate on North Atlantic patrols in World War I. All forward-deployed submarines were back-fitted with metal "chariot" bridge shields during the war. The coastal patrol nature of the small N-class submarines was emphasized by their lack of a deck gun. 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「United States N-class submarine」の詳細全文を読む スポンサード リンク
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