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The ''Narval'' class (''sous-marins d'escadre'', "fleet submarines") were patrol submarines built for the French Navy in the 1950s. == Design == The ''Narval'' type was an offspring of the ''E-48'' project, inspired by the German Type XXI U-boat of the Second World War, particularly the ''Roland Morillot'' brought into French service. Compared to the Type XXI, the ''Narval'' introduced an entirely new schnorchel system and novel detection systems, gained 33% in operational range on electric power (400 nautical miles, compared to the 290 available to the type XXI), and doubled the test depth. The propellers were also particularly studied to minimise noise. The hull of the ''Narval''s was assembled from seven 10-metre sections wielded together. The engine were 2-stroke diesels made by the French constructor Schneider, which proved unreliable and noisy to the point where the engine section became difficult to man at full power. From 1966 to 1970, the ''Narval'' underwent extensive modernisation, where their engines were replaced by a diesel-electrical design based on the SEMT-Pielstick 12PA4-185. The 4 stern tubes were deleted, electronics were replaced, and the conning tower was replaced by a more modern sail plan from the ''Daphné'' class. 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「French Narval-class submarine」の詳細全文を読む スポンサード リンク
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