Västergötland-class submarine

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HSwMS Västergötland (left)
Class overview
Name	Västergötland class
Builders	Kockums
Operators	Swedish Navy  Republic of Singapore Navy
Preceded by	Näcken class
Succeeded by	Gotland class
Subclasses	Södermanland class Archer class
Planned	4
Completed	4
Active	3
Retired	1
General characteristics
Type	Submarine
Displacement	Surfaced: 1,070 t (1,050 long tons; 1,180 short tons) Submerged: 1,150 t (1,130 long tons; 1,270 short tons)
Length	48.5 m (159 ft 1 in)
Beam	6.1 m (20 ft 0 in)
Draft	5.6 m (18 ft 4 in)
Propulsion	2 × Hedmora V12A/15 1 × Jeumont-Schneider electric motor
Speed	Surfaced: 11 kn (20 km/h; 13 mph) Submerged: 20 kn (37 km/h; 23 mph)
Complement	18 officers 6 conscripts
Sensors and processing systems	FAS
Armament	6 × 533mm tubes 3 × 400mm tubes Mines

The Västergötland class of diesel-electric submarines entered service in 1987 in the Swedish Navy allowing the last Draken II class of subs to be retired.

Following award of the design contract on 17 April 1978 and the construction contract on 8 December 1981 to Kockums AB, building commenced for four ships of the class (Västergötland, Hälsingland, Södermanland, and Östergötland) which were built between 1983 and 1988. The latter two have undergone comprehensive refits, including the insertion of a new hull section with an air-independent propulsion system equipped with Stirling engines. They have been recommissioned in 2003–2004 as the new Södermanland class.

Västergötland and Hälsingland were put in reserve until November 2005, when they were sold to the Republic of Singapore Navy as the Archer class. They were refitted to Södermanland class standards and received additional climatisation for use in tropical waters, and relaunched in 2009–2010.

Östergötland was decommissioned in 2021, leaving Södermanland as the last remaining ship of the class in Swedish service.^[1]

The Type A17 attack submarines were designed for the Swedish Navy as replacements for the Draken II-class submarines and incorporates the best properties from the preceding Sjöormen and Näcken classes. Requirements called for a multi-role submarine to carry out a variety of missions involving attack, mining, surveillance, anti-submarine, and interjection of Special Forces. It features a two-deck single-hull design with two watertight compartments divided by a centre watertight bulkhead controlled using an X-configuration rudder/after hydroplane design.

Submarines of the Västergötland class had greater submarine hunting capacity than previous classes, partly due to the fact that they were equipped with a new modern submarine torpedo. The Västergötland class were able to fire up to six heavy and six light wire-guided torpedoes at the same time against different targets, a world record that still stands today.^[2]

• List of submarine classes in service
• Collins-class submarine - enlarged versions of Västergötland used by the Royal Australian Navy
• List of active Swedish Navy ships

• Darman, Peter, ed. (2004). Twenty-first Century Submarines and Warships. Military Handbooks. Rochester: Grange Books. ISBN 1-84013-678-2.
• Gardiner, Robert; Chumbley, Stephen; Budzbon, Przemysław, eds. (1995). Conway's All the World's Fighting Ships 1947–1995. Annapolis: Naval Institute Press. ISBN 1-55750-132-7.
• Miller, David (1989). Modern Submarines. Combat Arms. New York: Prentice Hall Press. ISBN 0-13-589102-7.