HSwMS Sjöhunden (Shu)

HSwMS Sjöhunden (Shu), Sw. meaning sea dog, was the fourth ship of the Swedish submarine class Sjöormen, project name A11.

HSwMS Sjöhunden underway between 1968-1997
History
Sweden
Name: HSwMS Sjöhunden
Ordered: 1966
Builder: Karlskrona naval base
Launched: 21 March 1968
Commissioned: 25 July 1969
Decommissioned: 1997
Motto: Cave canem ("Beware of the dog")
Nickname(s): Shu
Fate: Sold to Singapore in 1997
Singapore
Name: RSS Chieftain
Namesake: Chieftain
Acquired: 28 May 1999
Commissioned: 26 June 2004
Decommissioned: 11 March 2015
Homeport: Changi Naval Base, Singapore
Status: Active
General characteristics
Class and type:
Displacement:
  • 1,130 t (1,112 long tons) surfaced
  • 1,210 t (1,191 long tons) submerged
Length: 50.5 m (165 ft 8 in)
Beam: 6.1 m (20 ft 0 in)
Draught: 5.8 m (19 ft 0 in)
Propulsion:
  • 2 × Hedemora Diesel generators
  • 1 × electric motor
  • 1 shaft
Speed: 20 knots (37 km/h; 23 mph)
Complement: 25 officers and enlisted
Armament:

Development

The planning of the class included a number of different AIP-solutions including nuclear propulsion, however the ships where finally completed with for the time extremely large batteries. The ship was a single hull submarine, with hull shape influenced by the American experimental submarine USS Albacore. The hull was covered with rubber tiles to reduce the acoustic signature (Anechoic tiles), at this time a pioneer technology. The Sjöormen class also pioneered the use of an x-shaped (as opposed to cross-shaped) rudder as a standard (as opposed to experimental) feature.[1][2]

Service history
HSwMS Sjöhunden being launched on 21 March 1968

The submarine served in the Swedish Navy for almost 30 years and was then sold to Singapore in 1997 together with its four sister ships.

HSwMS Sjöhunden was renamed RSS Chieftain and Singapore acquired the boat on 28 May 1999. She was commissioned into the Republic of Singapore Navy on 26 June 2004 after a major refit. She was in active service as of 2020.

References
  1. "Challenger Class Submarine". Ministry of Defense Singapore. Retrieved 29 July 2020.
  2. "SJÖHUNDEN (1968) [sv] - KulturNav". kulturnav.org. Retrieved 30 July 2020.


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