HSwMS Östergötland (Ögd)

History
Sweden
Name	HSwMS Östergötland
Namesake	Swedish province Östergötland
Ordered	1980s
Builder	Kockums
Launched	9 December 1988
Commissioned	1990, (2007)
Decommissioned	2021
Motto	Securitas orare maritimare ("Coastal Security")
Nickname(s)	Ögd
Status	In Reserve/Mothballed
Badge
General characteristics
Class and type	Västergötland-class submarine; Södermanland-class submarine;
Displacement	1,400 t (1,378 long tons) surfaced; 1,500 t (1,476 long tons) submerged;
Length	60.5 m (198 ft 6 in)
Beam	6.1 m (20 ft 0 in)
Propulsion	2 × Hedemora Diesel generators; 2 × Kockums v4-275R Sterling AIP units;
Speed	8 knots (15 km/h; 9.2 mph) (Surfaced) 15 knots (28 km/h; 17 mph) (Submerged)
Complement	28 officers and enlisted
Armament	6 × (533 mm (21 in) torpedo tubes); 3 × (400 mm (16 in) torpedo tubes);

HSwMS Östergötland (Ögd), is a submarine of the Swedish Navy named after Östergötland, Sweden. She is the fourth and last ship of the Västergötland class.

Development

The submarine design combined the best properties from the Sjöormen class and the Näcken class. 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 submarines of the Västergötland class were able to fire up to six heavy and six light wire-guided torpedoes at the same time against different targets.^[1]

The Västergötland class included the submarines Södermanland and Östergötland. After significant upgrades, these two submarines were reclassified to a new Södermanland class.

Service history

Between 2000 and 2004, Östergötland and Södermanland underwent extensive modifications, were extended by 12 meters and fitted with air-independent Stirling engines. At the same time, the submarines would be modified to handle international missions with operations in hot and salty waters. The conversion of the two submarines became so extensive that Kockums decided to reclassify the submarines to a new Södermanland class.^[2]^[3]

Östergötland was decommissioned in 2021.

References

^ "Baltic Sea". Corporal Frisk. Retrieved 2020-07-30.
^ Anders Ingvarsson. "Sågad ubåt klarar värmen bättre". Ny Teknik (in Swedish). Retrieved 2020-07-30.
^ Ahlquist, Erik. "HMS Östergötland på slutövning". Försvarsmakten (in Swedish). Retrieved 2020-07-30.

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[1] "Baltic Sea". Corporal Frisk. Retrieved 2020-07-30.

[2] Anders Ingvarsson. "Sågad ubåt klarar värmen bättre". Ny Teknik (in Swedish). Retrieved 2020-07-30.

[3] Ahlquist, Erik. "HMS Östergötland på slutövning". Försvarsmakten (in Swedish). Retrieved 2020-07-30.

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Västergötland-class submarines
Swedish Navy	Västergötland Hälsingland Södermanland^† Östergötland^†
Republic of Singapore Navy Archer class	Archer (ex-Hälsingland) Swordsman (ex-Västergötland)
^† - converted to Södermanland class Preceded by: Näcken class Followed by: Gotland class List of submarines of the Swedish Navy