Oyashio-class submarine

The Oyashio class is a series of Japanese diesel-electric attack submarines operated by the JMSDF. The submarines entered service in the late 1990s. The submarines are larger than the earlier Harushio class, to provide space for a flank sonar array.

Oyashio at Pearl Harbor in 2006
Class overview
NameOyashio (おやしお, Oyashio Current)
Builders
Operators Japan Maritime Self-Defense Force
Preceded byHarushio class
Succeeded bySōryū class
Built1994–2008
In commission1998–present
Planned11
Completed11
Active9 (2 converted to training ships)
General characteristics
TypeAttack submarine
Displacement
Length81.7 m (268 ft 1 in)
Beam8.9 m (29 ft 2 in)
Draught7.4 m (24 ft 3 in)
Propulsion
  • Diesel-electric
  • 2 Kawasaki 12V25S diesel engines
  • 2 Kawasaki alternators
  • 2 Toshiba motors
  • 3,400 hp (2,500 kW) surfaced
  • 7,750 hp (5,780 kW) submerged
Speed
  • 12 knots (22 km/h; 14 mph) (surfaced)
  • 20 knots (37 km/h; 23 mph) (submerged)
Complement70 (10 officers)
Sensors and
processing systems
  • Sonar: Hughes/Oki ZQQ-6 hull-mounted sonar, flank arrays, 1 towed array
  • Radar: JRC ZPS 6 I-band search radar.
Armament

Boats

There are a total of 11 boats in the class - the last boat was commissioned in 2008. Oyashio, Michishio, and Kuroshio share their names with World War II destroyers. Takashio shares a name with a ship from the third set of Yūgumo-class destroyers, of which none were built.

The first two boats, Oyashio and Michishio, have since been converted to training platforms.

On February 1, 2018, the Ministry of Defence's Maritime Staff Office revealed that seven of the service's 82-metre (269 ft 0 in) Oyashio-class submarines, which have a surface displacement of 2,800 tonnes – have already completed service-life extension work to date. The seven boats received extensive refits during their second and third maintenance cycles, which have been planned to bring the vessels to "almost the same level of that of the latest model Sōryū-class submarine, while extending their service lives.[1]

Project no.Building no.Pennant no.NameJapaneseLaid downLaunchedCommissionedShipyardNote
S1308105SS-590/
TSS-3608		Oyashio おやしお 26 January 199415 October 1996 16 March 1998Kawasaki Shipbuilding Corporation, Kobe[2]Converted to training submarine (TSS-3608) on 6 March 2015
8106SS-591Michishio みちしお 16 February 199518 September 1997 10 March 1999Mitsubishi Heavy Industries, KobeConverted to training submarine (TSS-3609) on 27 February 2017
8107SS-592Uzushio うずしお 6 March 199626 November 1998 9 March 2000Kawasaki Shipbuilding Corporation, Kobe
8108SS-593Makishio まきしお 26 March 199722 September 1999 29 March 2001Mitsubishi Heavy Industries, Kobe
8109SS-594Isoshio いそしお 9 March 199827 November 2000 14 March 2002Kawasaki Shipbuilding Corporation, Kobe
8110SS-595Narushio なるしお 2 April 19994 October 2001 3 March 2003Mitsubishi Heavy Industries, Kobe
8111SS-596Kuroshio くろしお 27 March 200023 October 2002 8 March 2004Kawasaki Shipbuilding Corporation, Kobe
8112SS-597Takashio たかしお 30 January 20011 October 2003 9 March 2005Mitsubishi Heavy Industries, Kobe
8113SS-598Yaeshio やえしお 15 January 20024 November 2004 9 March 2006Kawasaki Shipbuilding Corporation, Kobe
8114SS-599Setoshio せとしお 23 January 20035 October 2005 28 February 2007Mitsubishi Heavy Industries, Kobe
8115SS-600Mochishio もちしお 23 February 20046 November 2006 6 March 2008Kawasaki Shipbuilding Corporation, Kobe
  • JS Mochisio (SS 600) departs Joint Base Pearl Harbor–Hickam to support Rim of the Pacific (RIMPAC) 2010 exercises.
    JS Mochisio (SS 600) departs Joint Base Pearl Harbor–Hickam to support Rim of the Pacific (RIMPAC) 2010 exercises.
  • Oyashio-class submarine.
    Oyashio-class submarine.
  • Oyashio-class submarine.
    Oyashio-class submarine.
  • JS Kuroshio (SS 596) at the Maizuru Naval Base.
    JS Kuroshio (SS 596) at the Maizuru Naval Base.
  • JS Narushio (SS 595) pulls into Pearl Harbor for a scheduled port call before starting Rim of the Pacific (RIMPAC) 2008.
    JS Narushio (SS 595) pulls into Pearl Harbor for a scheduled port call before starting Rim of the Pacific (RIMPAC) 2008.
  • JS Yaeshio (SS 598) arrives at Naval Station Pearl Harbor for an annual training exercise.
    JS Yaeshio (SS 598) arrives at Naval Station Pearl Harbor for an annual training exercise.
  • JS Uzushio (SS 592) arrives at Joint Base Pearl Harbor–Hickam to begin their annual training exercise.
    JS Uzushio (SS 592) arrives at Joint Base Pearl Harbor–Hickam to begin their annual training exercise.
  • JS Mochishio (SS 600) arrives at Joint Base Pearl Harbor–Hickam to support Rim of the Pacific (RIMPAC) exercises.
    JS Mochishio (SS 600) arrives at Joint Base Pearl Harbor–Hickam to support Rim of the Pacific (RIMPAC) exercises.
  • Oyashio-class submarine profile
    Oyashio-class submarine profile

See also

References
  1. "Japan outlines submarine modernisation efforts". February 1, 2018. Archived from the original on March 2, 2018. Retrieved March 1, 2018.
  2. Saunders, Stephen (2004). Jane's Fighting Ships 2004-2005. Jane's Information Group. p. 384. ISBN 0-7106-2623-1.
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