![]() Unlike traditional propellers, which use unshrouded blades to churn through the water, a pumpjet sucks in water and ejects it under pressure from the rear of the pumpjet. Sutton/Covert ShoresĢ9SS also features a pumpjet instead of the traditional propeller for propulsion. (The designation “29SS” is derived from the 29th year of the reign of Emperor Akihito, otherwise known to everyone else as 2017, and SS is the international shorthand for non-nuclear attack submarine.)ĭepiction of 29SS submarine. So it’s not exactly surprising that Mitsubishi Heavy Industries, one of Japan’s top submarine builders, has already unveiled the country’s next-generation submarine design, designated 29SS. Japan however typically keeps its submarines in service for just twenty years, a relatively short time for modern warships. The Sōryū class is relatively young: the first sub was launched in 2009, and in many navies it’s difficult to imagine work already proceeding on a replacement. ![]() Last year Japan upgraded the class by installing large banks of lithium-ion batteries as a quiet source of power. The current Sōryū class is a large, quiet submarine equipped with extensive soundproofing, automated combat systems, and an air-independent propulsion system that allows the submarine to operate for weeks without surfacing. Japan’s Maritime Self Defense Force has over twenty diesel electric submarines that are considered the finest in the world. One of the largest submarine powers in the world is a country that technically doesn’t even have a navy: Japan. ![]() Note x-shaped stern planes emerging from the water at a 45 degree angle. A Sōryū class submarine anchored at the naval base at Kure, Japan. ![]()
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