The Soryu Class Diesel Electric Submarines which is currently Operated by the JMSDF Japanese Maritime Self Defence Forces. Japan currently operating Five such Advanced Soryu class SSK while two others kept in Reserve. the soryu is the currently most advanced Diesel electric submarine compared to all other SSK. while SSK Designates the Hull powered by a Diesel Electric and It's primary function is the Attack role. compared to other latest generation SSK the Japanese Design gets more Marks due it's payload censor systems and endurance and Specially it's fuel systems.
The Soryu is the improved version of existing Oashio class submarines. The soryu's hull made up of special high tensile steel and coated with anechoic which is used to escpae from enemy sonar detection. thus gives the submarine hard to identity to his enemies. The total sub is controlled by automatic system components which used for easy to operate and requires less crew to maintain such a long ship. the main Propulsion engine is the two Kawasaki Diesel submarine which is used to propel the one mega shaft fitted in the submarine. another set of four Kawasaki kokums Stirling engines gives secondary supply to the on-board systems and used for emergency propulsion.
The sub also have snorkel equipments which can be used for emergency exit at any water level and deep submerged conditions. the sub can track sea surface and Air targets using it's ZPS 6F radar which is good for Searching surface levels and low level air search. The Sub's front hull house the main sonar system and another four sonar's also fitted in the sub's side. the sub also having a towed array radar which can tow a sonar who can track the targets without using the sub's main sonar and prevent the sub can be identified to enemies while in search for targets.
The ship's main defence weapon is launching decoys. the Soryu comes with three dedicated tubes for launching decoy units which creates big bubbles and acoustic signature can confuse the incoming torpedo. The sub's primary attack tubes are six 533 mm torpedo tubes the unique tubes can launch both torpedo's and anti shipping cruise missiles also known as tube launched cruise missiles. the same can be used for deploying mines around the sea. the entire weapon packages are 30 set of both torpedo's missiles and mines.the 533mm Type 89 is a wire-guided torpedo with active and passive homing modes. It has a maximum speed of 130km/h and can engage targets within the range of 50km. The torpedo can carry a warhead of 267kg
The soryu's is some 84 meters long and about some 3000 tons when surfaced and it's weight can be increased by 4000 tons if it submerged. the ship need some 65 crew members include ship officers and Commanders. the ship can achieve speed upto some 13knots while it can reach some 20knots when submerged. the maximum range of the submarine quoted around some 6000 nautical miles. once it can left the harbor it can travel some 6000 miles with submerged and surfaced mode and it can hold under the water contentiously some 70 days without coming surface. thanks to it's AIP
Know how the AIP in soryu works . this good information provided by Arnab Mitra
Hydrogen is used as fuel in Hydrogen fuel cells
Hydrogen fuel cells are used to generate electricity
The electricity is used to run the propulsion motor
The electricity is also used to do electrolysis of sea water
Electrolysis of sea water produces Hydrogen
Back to step 1
As of now Japan is the sole operator of this soryu by some 5 active subs and participating the Australian Collins class replacement Program
But recently India just asked the Japanese to provide information about soryu and Requsted to participate in the Indian Navy Project 75 I. which means the sub can be made in India under the Make in India Program where nearly some 12 of these submarines can be procured. Just checkout the Current Indian Diesel Electric submarine Fleet and It's comparison.