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. (January 2013)
HSwMS Södermanland at sea
- HSwMS Södermanland
- HSwMS Östergötland
|General characteristics |
Submerged: 1,500 t (1,500 long tons; 1,700 short tons)|
60.5 m (198 ft 6 in)|
6.1 m (20 ft 0 in)|
5.6 m (18 ft 4 in)|
- 2 × Hedemora Diesel-electric engines
- 2 × Kockums v4-275R Sterling AIP units
Submerged: 20 kn (37 km/h; 23 mph)|
|Sensors and |
- 6 × 533 mm (21.0 in) torpedo tubes
- 3 × 400 mm (15.7 in) torpedo tubes
The Swedish Södermanland class of diesel-electric submarines consists of HSwMS Södermanland and HSwMS 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 in 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.
Two submarines of similar modifications, known as the Archer class are in service with the Republic of Singapore Navy.