Soryu is the name of a class of Japanese hybrid submarine destroyers (SS). The first unit of this type was launched in 2007. A total of 14 units of this type have been built or are planned to be built, of which 8 are operational and remain in the line. The Soryu-type ship has a length of 84 m, a width of 9.1 m and a displacement of about 4,200 tons. The maximum underwater speed is approximately 20 knots. Ships of this type are equipped with six 533 mm torpedo tubes. The Soryu-class ships were designed and put into production to complement and eventually likely replace the Oyashio-class battleships. The new submarines of the Japanese Navy are the first in history to have an air-independent hybrid propulsion system based on Stirling engines. Such a progressive technological solution makes it possible to reduce the noise of the unit, as well as to significantly extend the time of its immersion during patrolling. The devices also have very modern electronic and hydroacoustic equipment. Ships can fire both classic torpedoes and UGM-84A Sub Harpoon cruise missiles. At the moment, they are among the most modern non-nuclear submarines in the world, and the unit cost of one ship of this class is estimated at about $535 million at 2015 prices.
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