Sjöormen class submarine
RSS Chieftain
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| Class overview | |
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| Name: | Sjöormen class |
| Builders: |
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| Operators: | |
| Preceded by: | Draken class |
| Succeeded by: | Näcken class |
| Planned: | 5 |
| Completed: | 5 |
| Active: | 4 |
| Retired: | 1 |
| General characteristics | |
| Type: | Submarine |
| Displacement: |
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| Length: | 51 m (167 ft 3.9 in) |
| Beam: | 6.1 m (20 ft 0.2 in) |
| Draught: | 5.8 m (19 ft 0.3 in) |
| Propulsion: |
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| Speed: |
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| Endurance: | 21 days |
| Test depth: | 150 m (490 ft) |
| Complement: | 23 |
| Sensors and processing systems: |
FAS |
| Armament: |
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The Sjöormen class were a group of submarines built for the Swedish Navy in the late 1960s. They had a teardrop hull shape and were capable of diving to 150 metres (490 ft). At the time of their deployment they were regarded as one of the most advanced non-nuclear submarine-classes in the world, incorporating many new features including x-rudder and anechoic tiles. Both speed and underwater endurance was at this time very high for a conventional submarine. The submarines were retired by Sweden in the early 1990s. In the late 1990s, four submarines were acquired by the Republic of Singapore Navy and relaunched as the Challenger class following modernisation and tropicalisation.
As built, the Sjöormen class were designed with a teardrop hull shape, based on the United States' Barbel class. They had bow planes on the sail and their stern diving planes were configured in a x-shape. They had a standard displacement of 1,075 tonnes (1,058 long tons; 1,185 short tons) and 1,400 tonnes (1,400 long tons; 1,500 short tons) when dived. The submarines had a waterline length of 50 metres (164.0 ft) and a length overall of 51 metres (167.3 ft). They had a beam of 6.1 metres (20.0 ft) and a draught of 5.8 metres (19.0 ft). The Sjöormen class was powered by a diesel-electric propulsion system composed of two Pielstick diesel engines providing power to a ASEA electric motor driving one shaft with a five-bladed propeller. The entire system was rated at 2,200 brake horsepower (1,600 kW). This gave the submarines a surfaced speed of 15 knots (28 km/h; 17 mph) and 20 knots (37 km/h; 23 mph) submerged. The vessels had an endurance of 21 days and could reach a depth when dived of 150 metres (490 ft). Their diving depth is limited by the shallow waters of the Baltic Sea compared to the ocean depths.
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Wikipedia