| Södermanland-class submarine | |
|---|---|
 HMS Södermanland at sea | |
| Class overview | |
| Builders: | Kockums |
| Operators: |
 Swedish Navy |
| Preceded by: | Näcken |
| Succeeded by: | Gotland |
| Planned: | 4 |
| Completed: | 3 |
| Active: |
HMS Södermanland HMS Östergötland |
| General characteristics | |
| Displacement: | 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: | Submerged: 20 kn (37 km/h; 23 mph) |
| Complement: |
18 Officers 6 Conscripts |
| Sensors and processing systems: | FAS |
| Armament: |
6× 533 mm (21.0 in) Torpedo tubes 3× 400 mm (15.7 in) Torpedo tubes Mines |
The Swedish Södermanland class of diesel-electric submarines consist of the HMS Södermanland and HMS Östergötland. These two submarines were originally launched as Västergötland-class submarines in 1987 and 1990, and have been relaunched as a new class after extensive modernization 2003 and 2004 by Kockums AB. The pressure hull had been cut in two after the sail and a 12 m (39 ft 4 in) long new section with an air-independent propulsion system was inserted. It contains two Stirling engines which are coupled to electric generators and heated by burning diesel fuel with liquid oxygen stored in cryogenic tanks. The AIP system can provide electric energy to extend the submarine's submerged time from days to weeks.
The class is planned to remain in service until 2019-20 when it will be replaced by the future A26 submarine.[1]
Two submarines of similar modifications, known as the Archer class submarine are in service with the Republic of Singapore Navy.
Units[]
| Ship name | Laid down | Launched | Commissioned | Service | Status |
|---|---|---|---|---|---|
| HMS Södermanland | 12 April 1988 | 21 April 1989 | 1st Submarine Flotilla | Refitted 2003, Active | |
| HMS Östergötland | 9 December 1988 | 1989 | 1st Submarine Flotilla | Refitted 2004, Active |
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The original article can be found at Södermanland-class submarine and the edit history here.