Archer-class submarine

RSS Swordsman alongside Changi Naval Base
Class overview
Builders	Kockums
Operators	Republic of Singapore Navy
Preceded by	Challenger class
Succeeded by	Type 218SG
Completed	2
Active	2
General characteristics
Displacement	Surfaced: 1,400 t (1,400 long tons; 1,500 short tons) Submerged: 1,500 t (1,500 long tons; 1,700 short tons)
Length	60.5 m (198 ft 6 in)
Beam	6.1 m (20 ft 0 in)
Draft	5.6 m (18 ft 4 in)
Propulsion	2 × Hedemora diesel-electric engines 2 × Kockums v4-275R Sterling AIP units
Speed	Surfaced: 8 kn (15 km/h; 9.2 mph) Submerged: 15 kn (28 km/h; 17 mph)
Complement	28
Sensors and processing systems	FAS
Armament	6 × 533 mm (21 in) torpedo tubes for TP-617 heavy-weight torpedoes and Blackshark torpedoes 3 × 400 mm (16 in) torpedo tubes

The Archer-class submarines are a class of two diesel-electric submarines in active service with the Republic of Singapore Navy (RSN). Originally launched as the Swedish Navy Västergötland-class submarines HSwMS Hälsingland and HSwMS Västergötland in 1986 and 1987, the two submarines were sold to Singapore in November 2005 and relaunched in June 2009 and October 2010 respectively after extensive modernisation by Kockums, which included a refit to Södermanland class standards, the insertion of a new hull section with an air independent propulsion system, and additional climatisation for use in tropical waters.