Sjöormen-class submarine

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R.S.S. Chieftain.jpg
RSS Chieftain
Class overview
Builders: Kockums
Preceded by: Draken class
Succeeded by: Näcken class
Planned: 5
Completed: 5
Active: 4
Retired: 1
General characteristics
  • Surfaced: 1,125 t (1,107 long tons; 1,240 short tons)
  • Submerged: 1,400 t (1,400 long tons; 1,500 short tons)
Length: 50 m (164 ft 1 in)
Beam: 6.1 m (20 ft 0 in)
Draught: 5.1 m (16 ft 9 in)
  • Surfaced: 15 kn (28 km/h; 17 mph)
  • Submerged: 20 kn (37 km/h; 23 mph)
Complement: 23
Sensors and
processing systems:
  • 4× 533 mm (21 in) Torpedo tubes
  • 2× 400 mm (16 in) Torpedo tubes
  • Mines

The Sjöormen class were a group of submarines built for the Swedish Navy in the late 1960s. They had a teardrop shape and were capable of diving to 150m. At the time of their deployment they were regarded as one of the most advanced non-nuclear submarine-classes in the world, incorporating many new features including x-rudder and anechoic tiles. Both speed and underwater endurance was at this time very high for a conventional submarine. The submarines were retired by Sweden in the early 1990s. In the late 1990s, four submarines were acquired by the Republic of Singapore Navy and relaunched as the Challenger class following modernisation and tropicalisation.[1][2]


Ship Name Builder Launched Commissioned Status
HMS Sjöormen Kockums 25 Jan 1967 31 July 1968 sold to Singapore as RSS Centurion
HMS Sjölejonet Kockums 29 June 1967 16 Dec 1968 sold to Singapore as RSS Conqueror
HMS Sjöbjörnen Karlskrona Navy yard 9 Jan 1968 28 Feb 1969 sold to Singapore as RSS Challenger
HMS Sjöhunden Kockums 21 March 1968 25 June 1969 sold to Singapore as RSS Chieftain
HMS Sjöhästen Karlskrona Navy yard 6 Aug 1968 15 Sept 1969 sold to Singapore as spare parts


  1. ^ "Dr Tan Launches First Submarine in Sweden". Ministry of Defence Singapore. Retrieved 2012-12-06. 
  2. ^ "Submarine Tropicalisation Programme". MINDEF. Retrieved 2012-12-06. 
  • Conway's All the World's Fighting Ships 1947-1995

External links[edit]