Ula Class

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Ula Class Patrol Submarine
Ula Class 01.jpg
Ula Class Patrol Submarine
Career Flag of Kalmar Union.png
Nationality: Skandinavia
Operated by: Sjøforsvaret
Builder: Thyssen Nordseewerke
Ordered: First of class: September 1982
Launched: First of class: July 1988
Commissioned: First of class: April 1989
Status: In Service
General characteristics
Displacement: Surface: 1,040 tons
Submerged: 1,150 tons
Length: 59.0 m
Beam: 5.4 m
Draft: 4.6 m
Power: 30MW
Propulsion: 2 Saab SCANIA MDU 130 marine diesel engine generator with a lead acid battery
2 NAtech 220Kw PEM fuel cell
Speed: Surface: 13 kn
Submerged: 25 kn
Range: 5,700 nautical miles at 13 knots
Complement: 21
Armament: Sensors
1 x Kongsberg MSI-90U Combat Management System
1 x Kollmorgen search and attack periscope
1 x TERMA SCANTER 2100 Surveillance Radar
1 x Kongsberg CSU 90-2 Integrated sonar sensor suite
Decoys
1 x TERMA Loki submarine torpedo countermeasure
Armament
8 bow 21 in (533 mm) torpedo tubes
16 x Saab Dynamics Torpedo 617

Ula Class patrol submarine is a class of 10 ships in service under the Sjøforsvaret. The first 6 units were ordered to Thyssen Nordseewerke of Germany in 1982. Four more units were ordered in 1990.

Between 2007 and 2010 the 10 ships of the class underwent a process of modernization and upgrade that extended its useful life until at least 2024. After the upgrading process that affected mainly to the propulsion system and the electronic and combat systems, Ula Class submarines are considered one of the quieter and more manoeuvrable subs in the world. The submarine can be hardly detected by enemy surface vessels due to its trimmed profile what makes this kind of submarines ideal for operations in coastal areas.

Power generation & propulsion[edit | edit source]

Ula Class 03.jpg

After their mid life upgrade, the 10 ships of the class were equiped with a new propulsion system combining a conventional system consisting of a Saab SCANIA MDU 130 marine diesel engine generator with a lead acid battery and an air independent propulsion (AIP) system, used for silent slow cruising with oxygen and hydrogen storage. The fuel cell system uses 2 NAtech PEM fuel cells each with 220kW.

The diesel generator plant is mounted on a swinging deck platform with double elastic mounts for noise and vibration isolation. The propeller motor is directly coupled to the seven-bladed screwback propeller.

Electronic systems[edit | edit source]

One of the main design premises was the need to mount Skandinavian made electronic systems in order to full integration with other Forsvaret systems and satellite net.

Sensors

  • 1 x Kongsberg MSI-90U Combat Management System
  • 1 x Kollmorgen search and attack periscope
  • 1 x TERMA SCANTER 2100 Surveillance Radar
  • 1 x Kongsberg CSU 90-2 Integrated sonar sensor suite

Decoys

  • 1 x TERMA Loki submarine torpedo countermeasure

Armament[edit | edit source]

List of ships[edit | edit source]

# Name Ordered Launched Commissioned
S-301 KSS Ula September 1982 July 1988 April 1989
S-302 KSS Utsira September 1982 July 1988 April 1989
S-303 KSS Utstein September 1982 November 1988 January 1990
S-304 KSS Utvær September 1982 November 1988 January 1990
S-305 KSS Uthaug September 1982 June 1989 September 1990
S-306 KSS Uredd September 1982 June 1989 September 1990
S-307 KSS Ullerøy January 1990 March 1992 July 1993
S-308 KSS Uvdal January 1990 March 1992 July 1993
S-309 KSS Ulvik January 1990 December 1992 February 1994
S-310 KSS Utåker January 1990 December 1992 February 1994