Challenger-class submarine

	RSS Chieftain
Class overview
Builders	Kockums
Operators	Republic of Singapore Navy
Succeeded by	Archer class
Completed	4
Active	0
Retired	4
General characteristics
Type	Diesel-electric Attack submarine
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 &; processing systems	FAS
Armament	4 × 533 mm (21 in) torpedo tubes; 2 × 400 mm (16 in) torpedo tubes;

The Challenger class was one of the submarine classes of the Republic of Singapore Navy (RSN). They were extensively modernised versions of the former Sjöormen-class submarines. Challenger and Centurion were retired in 2015, while Conqueror and Chieftain were retired in 2024.

Class overview
RSS Chieftain
Builders	Kockums
Operators	Republic of Singapore Navy
Succeeded by	Archer class
Completed	4
Active	0
Retired	4
General characteristics
Type	Diesel-electric Attack submarine
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 & processing systems	FAS
Armament	4 × 533 mm (21 in) torpedo tubes 2 × 400 mm (16 in) torpedo tubes