HSwMS Sjöormen (Sor)

HSwMS Sjöormen (Sor), Sw. meaning sea serpent, was the lead ship in the Swedish submarine class Sjöormen, project name A11. The planning of the ships 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 (AGSS-569). The hulls 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. The submarine served in the Swedish Navy for almost 30 years and was then after upgrades sold to Singapore in 1997 together with its four sister ships.

HMS Sjöormen in August, 1967
History
Sweden
Name: Sjöormen
Builder: Kockums
Laid down: 1966
Launched: 25 January 1967
Commissioned: 31 July 1968
Decommissioned: 1997
Motto: Esse non videre ("To be without being seen") (1967–1994)[1]
Fate: Sold to Singapore in 1997
Singapore
Name: RSS Centurion
Acquired: 28 May 1999
Commissioned: 26 June 2004
Decommissioned: 2015
Status: Retired
General characteristics
Class and type: Sjöormen-class submarine
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 (23 mph; 37 km/h)
Complement: 25 officers and enlisted
Armament:

References

Notes
  1. Handbok: parad 6: traditionsvård : H PARAD 6 2016 (PDF) (in Swedish). Stockholm: Försvarsmakten. 2017. p. 54. SELIBR 22459606.

Print
  • Granholm, Fredrik (2003). Från Hajen till Södermanland: svenska ubåtar under 100 år [From Hajen to Södermanland: Swedish submarines during 100 years]. Marinlitteraturföreningen, 0348-2405 ; 89Forum navales skriftserie, 1650-1837 ; 7 (in Swedish). Stockholm: Marinlitteraturfören. ISBN 91-85944-40-8. SELIBR 9212796.



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