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Soryu class

Diesel-powered attack submarine

Soryu class submarine

The Soryu class boats are larger than any previous Japanese submarines since the WWII

 
 
Country of origin Japan
Entered service 2009
Crew 65 men
Diving depth (operational) ~ 250 m
Diving depth (maximum) ~ 500 m
Sea endurance ?
Dimensions and displacement
Length 84 m
Beam 9.1 m
Draught 8.5 m
Surfaced displacement 2 900 tons
Submerged displacement 4 200 tons
Propulsion and speed
Surfaced speed 13 knots
Submerged speed 20 knots
Diesel engines 1 x 3 900 / 8 000 hp
Electric motors ?
Armament
Missiles UGM-84 Sub-Harpoon launched form torpedo tubes
Torpedoes 6 x 533 mm torpedo tubes for Type 89 torpedoes and missiles

 

   The Soryu class is a new class of Japanese diesel-powered attack submarines. It evolved from Oyashio class design. The name Soryu means Blue Dragon. The first boat was named after Japanese Imperial Navy aircraft carrier Soryu. It was commissioned in 2009. All other boats of this class are also named after Japanese mythological creatures. The Soryu class boats replaced in service the older Harushio class diesel-powered attack submarines. The Japan Maritime Self-Defense Forces (JMSDF) plans to operate at least 14 of these diesel-electric attack submarines.

   The Soryu class boats are significantly larger than Oyashios. Furthermore these submarines have a larger displacement than any previous Japanese submarines since the World War II.

   It can be distinguished from the Oyashio class by the X-shape rudders. Such rudder configuration was first used on the Swedish Gotland class. It is computer aided and provides the submarine with extreme maneuverability. It also enables to operate very close to seabed.

   Submarines have hydrodynamic design and are fitted with anechoic coating. Interior also has sound isolation of loud components. Japan used top-secret stealth technology on these boats.

   The Soryu class submarines are armed with six 533 mm torpedo tubes for the Type 89 torpedoes and UGM-84 Sub-Harpoon anti-ship missiles. Boats have high automation in combat systems.

   Theses vessels are powered by a Swedish-made Stirling air-independent propulsion system. The Soryu is significantly larger than Oyashio class boats, in order to incorporate this propulsion system. This system is license-produced by Kawasaki Heavy Industries. It allows to stay submerged for longer periods of time without surfacing to charge the batteries. Submerged endurance is increased from days to weeks. It also enhanced vessel's stealth and operational capabilities. The Soryu class has an all-weather snorkel system that can operate even during a typhoon.

   The AIPS develops 3 900 hp surfaced and 8 000 hp submerged. Power is delivered through one shaft.

   Latest Soryu class submarines, including the SS-511 Oryu and SS-512 Toryu use a new lithium-ion battery propulsion technology. These are the first submarines in the world to use this technology. Currently it is one of Japan's most guarded military technologies. The use of lithium-ion batteries instead of the lead-acid batteries have almost doubled the electrical storage capacity and decreased the time required to recharge. Also the amount of batteries carried was increased as the Stirling air independent propulsion system was removed and replaced with additional lithium-ion batteries. This significantly improved underwater endurance over the previous Soryu class boats, as well as other most advanced diesel-electric submarines.

 

Name Laid down Launched Commissioned Status
Soryu (SS-501) 2005 2007 2009

active, in service

Unryu (SS-502) 2006 2008 2010

active, in service

Hakuryu (SS-503) 2007 2009 2011

active, in service

Kenryu (SS-504) 2008 2010 2012

active, in service

Zuiryu (SS-505) 2009 2011 2013

active, in service

Kokuryu (SS-506) 2011 2013 2015

active, in service

Jinryu (SS-507) 2012 2014 2016

active, in service

Sekiryu (SS-508) 2013 2015 2017

active, in service

Seiryu (SS-509) 2013 2016 2018

active, in service

Shoryu (SS-510) 2015 2017 2019

active, in service

Oryu (SS-511) 2015 2018 2020

active, in service

Toryu (SS-512) 2017 2019 expected in 2021

under construction

(SS-513) 2017 expected in 2020 expected in 2022

under construction

(SS-514) 2018 expected in 2021 expected in 2023

under construction

 

 

 
Soryu class submarine

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Soryu class submarine

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Soryu class submarine

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Soryu class submarine

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Soryu class submarine

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