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The ''Sōryū''-class submarines (''16SS'') are diesel-electric attack submarines that entered service with the Japan Maritime Self-Defense Force in 2009. The design is an evolution of the , from which it can most easily be distinguished by its X-shaped tail planes. The ''Sōryūs'' have the largest displacement of any submarine used by post-war Japan. It is Japan's first AIP submarine. The class are fitted with air-independent propulsion based on Kockums stirling engines license-built by Kawasaki Heavy Industries, allowing them to stay submerged for longer periods of time. Some recent information suggest that the last units in the series will have their air independent propulsion systems replaced with banks of Li-Ion batteries. The cost of the sixth submarine (''Kokuryū'') was estimated at 540 million USD. The 11th Soryu class submarine, with improved underwater endurance, etc. compared with the existing Soryu-class submarines by mounting lithium-ion batteries, was given a budget of ¥64.3 billion/US$536.7 million under the 2015 Japanese Defense Budget. ==Naming convention== Japanese submarines since World War II were named after ocean currents. The JMSDF changed its naming convention with the ''Sōryū'',〔(海上自衛隊訓令第３０号 ), Japan Maritime Self Defense Force〕 and submarines will now be named after mythological creatures. ''Sōryū'' (そうりゅう) means blue (or green) dragon in Japanese and is named after the World War II carrier , which was sunk during the Battle of Midway. 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「Sōryū-class submarine」の詳細全文を読む スポンサード リンク
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