Challenger-class submarine

The Challenger class is one of the submarine classes of the Singapore Navy. They are extensively modernized versions of ex-Sjöormen class submarines. Challenger and Centurion were retired in 2015.


Challenger-class submarine
Class Ship
Type Submarine
Manufacturer Kockums Naval Solutions
Origin Singapore
Country Name Origin Year
Singapore 1997
Country Name Operational Year Retirement Year
Singapore 2001 View
ManufacturerName Production From Production To Quantity
Kockums Naval Solutions 4 View

In 1995, the RSN acquired a Challenger class (formerly known as Sjöormen class) submarine from the Swedish Navy and another three in 1997, making them Singapore's first underwater platforms. It is believed that the Challenger class were purchased to develop the required submarine operations expertise before selecting a modern class of submarines to replace them, since all the boats are over 40 years old.

Ships in Class

Ship Name Launched Commissioned Status
RSS Challenger (ex-HMS Sjöbjörnen) 26 September 1997
retired 11 March, 2015
RSS Conqueror (ex-HMS Sjölejonet) 28 May 1999 22 July 2001 in active service, as of 2011
RSS Centurion (ex-HMS Sjöormen) 28 May 1999 26 June 2004 retired 11 March, 2015
RSS Chieftain (ex-HMS Sjöhunden) 22 May 2001 24 August 2002 in active service, as of 2011

Class overview
Builders: Kockums
Operators:  Republic of Singapore Navy
Succeeded by: Archer class
Completed: 4
Active: 2
General characteristics
Displacement: 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)
Propulsion: 1 shaft 2 × Pielstick diesel
1 × ASEA electric motor
Speed: Surfaced: 15 kn (28 km/h; 17 mph)
Submerged: 20 kn (37 km/h; 23 mph)
Complement: 23
Sensors and
processing systems:
FAS
Armament: 4 × 533 mm (21 in) torpedo tubes
2 × 400 mm (16 in) torpedo tubes

End notes