Challenger-class submarine

	RSS Chieftain
Class overview
Builders	Kockums
Operators	Republic of Singapore Navy
Succeeded by	Archer class
Completed	4
Active	2
Retired	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;

The Challenger class is one of the submarine classes of the Republic of Singapore Navy (RSN). They are extensively modernised versions of the former Sjöormen-class submarines. Challenger and Centurion were retired in 2015, while Conqueror and Chieftain are still in active service as of 2022.

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