Visby Class

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Visby Class Stealth Missile Corvette
Visby 03.jpg
Visby Class Stealth Missile Corvette
Career Flag of Kalmar Union.png
Nationality: Skandinavia
Operated by: Skandinavia
Builder: Kockums
NAtech Marine(since 2011)
Ordered: First of class: October 2001
Launched: First of class: June 2003
Commissioned: First of class: January 2005
Status: In Service
General characteristics
Displacement: 640 tonnes
Length: 72.7 m
Beam: 10.4 m
Draft: 2.4 m
Power: 24MW
Propulsion: NAtech/Volvo COFCAG (multi-gas turbine and fuel cell propulsion system) with two NAtech Marine hydrojets
Speed: 39 knots
Maximum speed: 51 knots
Range: 3,100 nautical miles at 39 knots
Complement: 43
Armament: Sensors
1 x TERMA C-Flex Combat Management System
1 x Saab 9LV FCS Fire Control System
1 x Saab EOS 500 Electro Optical Fire Control
1 x TERMA SCANTER 4100 Surveillance Radar
1 x Kongsberg C-Scope Sonar System
Electronic warfare
1 x TERMA TV-112 tactical radar surveillance system
Decoys
1 x TERMA DL-22T Multi Ammunition Decoy System
1 x TERMA Loki torpedo countermeasure
Armament
1 × 8 cell Vertical Launching System w/ 16 Meteor SAM missile
12 × RBS15 Mk3 SSMs
4 × torpedo tubes for Torpedo 62
Depth charges
1 × 57 mm BOFORS Mk.3
1 x 30 mm Kongsberg Sea Protector CIWS
Aircraft carried: 1 x AS532 SC Cougar ASUW / ASW
1 UAV

Visby Class Stealth Missile Corvette were designed to be the main Sjøforsvaret's element for coastal water operations. The ship's design heavily emphasizes low visibility, radar cross-section and infrared signature as well as high speed and maneuverability. The first ship in the class is named after Visby, the main city on the island of Gotland. In 2020 there are 20 ships in service and 2 more under construction. The first 12 units were built by Kockums, while the following ones were built by NAtech Marine after acquiring the surface ship business of the former Kockums.

Design[edit | edit source]

The design of the Visby aims to minimise the optical and infrared signature, above water acoustic and hydroacoustic signature, underwater electrical potential and magnetic signature, pressure signature, radar cross section and actively emitted signals. A stealth corvette of the Visby Class has a detection range of 10km in rough seas and 18km in calm sea without jamming. In a jammed environment, the Visby would be detected at a range of 6km in rough sea and 9km in calm sea.

The hull material is a sandwich construction comprising a PVC core with a carbon fibre and vinyl laminate. The material provides high strength and rigidity, low weight, good shock resistance and very low radar and magnetic signature.

Command & Control[edit | edit source]

Visby Class were the first Sjøforsvaret's ships to be equiped with TERMA C-Flex Combat Management System. C-Flex is basen on open system architecture and is able to integrate the Saab 9LV FCS Fire Control System and Saab EOS 500 Electro Optical Fire Control. The system is completed with a TERMA SCANTER 4100 Surveillance Radar and a modified Kongsberg C-Scope Sonar System.

The communications system has a high-capacity digital communications switch, developed by TERMA, which interconnects the voice and data communications channels. The system provides internal communications or open conference lines and access to external communications with various radio links and land-based networks.

Power generation & propulsion[edit | edit source]

FLOSK chose to equip the ship with a mixed multi-gas turbine and fuel cell propulsion system (COFCAG) developed jointly by NAtech and Volvo Aero. Main fuel for which the system has been designed is hydrogen, but the system can also work with natural gas, methane and other gases, although with a lower energy efficiency. At low speed and during maneuvers the system uses the power delivered by the fuel cells, using the gas turbine system to achieve higher speeds. In addition, the system reuses the exhaust gases to turbocharge the turbine and for the ship's heating systems, which considerably reduces the ship's thermal footprint and finally the remaining gases are expelled from the stern. Power plant of the ship was designed taking into account the current needs of energy for propulsion and other systems on board, so it was possible to assume an increase in power required if new equipment or systems were installed in the future.

The propulsion system is fully electrical with two NAtech Marine hydrojets mounted externally to the main hull. The electricity for the motors is supplied by the power system. The ship has rudders and bowthrusters for harbour manoeuvring.

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 TERMA C-Flex Combat Management System
  • 1 x Saab 9LV FCS Fire Control System
  • 1 x Saab EOS 500 Electro Optical Fire Control
  • 1 x TERMA SCANTER 4100 Surveillance Radar
  • 1 x Kongsberg C-Scope Sonar System

Electronic warfare

  • 1 x TERMA TV-112 tactical radar surveillance system

Decoys

  • 1 x TERMA DL-22T Multi Ammunition Decoy System
  • 1 x TERMA Loki torpedo countermeasure

Armament[edit | edit source]

Air wing[edit | edit source]

1 x AS532 SC Cougar ASUW

List of ships[edit | edit source]

Visby 04.jpg
# Name Ordered Launched Commissioned
K-30 KSS Visby October 2001 June 2003 January 2005
K-31 KSS Helsingborg October 2001 June 2003 November 2005
K-32 KSS Härnösand October 2001 June 2003 November 2005
K-33 KSS Nyköping October 2001 June 2003 January 2006
K-34 KSS Karlstad October 2001 March 2004 June 2006
K-35 KSS Uddevalla October 2001 March 2004 June 2006
K-36 KSS Trollhättan October 2001 March 2004 November 2006
K-37 KSS Borlänge October 2001 August 2005 May 2007
K-38 KSS Kälarne October 2001 August 2005 October 2007
K-39 KSS Gällivare October 2001 August 2005 January 2008
K-40 KSS Umeå January 2012 March 2012 November 2013
K-41 KSS Särna January 2012 March 2012 November 2013
K-42 KSS Ljusdal January 2012 January 2013 March 2014
K-43 KSS Gävle January 2012 January 2013 March 2014
K-44 KSS Arvika January 2012 January 2014 March 2015
K-45 KSS Kristinehamn January 2012 January 2014 March 2015
K-46 KSS Katrineholm January 2012 January 2015 February 2016
K-47 KSS Skara January 2012 January 2015 February 2016
K-48 KSS Nybro January 2012 December 2015 November 2016
K-49 KSS Kungälv May 2015 June 2016 September 2017
K-50 KSS Strömstad May 2015 August 2018 October 2020
K-51 KSS Sölverborg May 2015 August 2018 January 2021