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HSwMS Neptun
Class overview
Name	Näcken-class
Builders	Kockums
Operators	Swedish Navy  Royal Danish Navy
Preceded by	Template:Sclass-
Succeeded by	Template:Sclass-
Planned	3
Completed	3
Laid up	1
Retired	3
Preserved	1
General characteristics
Type	Submarine
Displacement	980 tonnes (960 long tons) surfaced 1,150 tonnes (1,130 long tons) submerged
Length	44 m (144 ft 4 in)
Beam	5.7 m (18 ft 8 in)
Draught	5.5 m (18 ft 1 in)
Propulsion	2 × MTU diesel engines 1 × Jeumont-Schneider electric motor 1 shaft
Speed	20 knots (37 km/h; 23 mph) surfaced 25 knots (46 km/h; 29 mph) submerged
Test depth	150 m (490 ft)
Complement	19 (5 officers)
Sensors and processing systems	FAS
Armament	6 × 533 mm (21 in) torpedo tubes 2 × 400 mm (16 in) torpedo tubes Mines

The Näcken-class submarines, also known as the A14 type, were built for the Swedish Navy in the late 1970s. The boats were authorised in 1972 and the programme was completed in 1981. All boats were built by Kockums in Karlskrona. The boats had a teardrop hull and diving depth was 150 metres (490 ft). Between 1987 and 1988 Näcken was cut in half and an 8-metre (26 ft) long hull section containing a prototype Air-independent propulsion (AIP) using a closed cycle Stirling engine was installed between the aft battery/propulsion & power control room and the engine/motor room. This technology increased underwater endurance to 14 days and has been adopted in subsequent Swedish submarines.

References

Notes

Bibliography

• Conway's All the World's Fighting Ships 1947-1995

• Näcken-class submarines
• Submarine classes
• 1970s ships