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Thetis - Royal Danish Navy frigate F357
Ships and Harbours
No: 5546   Contributor: Peter Langsdale   Year: 2008   Manufacturer: Svendborg Værft A/S, Denmark   Country: Denmark
Thetis - Royal Danish Navy frigate F357

Photographed in the Naval basin at Fredrikshavn on 18 June 2008.
One of 4 Thetis class frigates for the Royal Danish Navy, built by the Svendborg Shipyard on the island of Funen in Svendborg, Denmark. The Thetis (F357) was commissioned in 1991.
These are multi-role frigates for fishery protection, surveillance, air-sea rescue, anti-pollution and ice reconnaissance.
They have a double-skinned hull divided by ten bulkheads into watertight compartments. The basic hull shape corresponds to that of a high-speed trawler. There are no bilge keels, but stabilisation is achieved by a combination of fin stabilisers from Blohm and Voss and a controlled passive tank system supplied by Intering.
They are ice-strengthened and are able to proceed through 80cm of solid ice. The hull has an icebreaking bow and stem lines suitable for operations in ice with only one propeller. To minimise ice formation on the superstructure, all winches, capstans, etc. are placed under deck. The allowed amount of icing is 375t.
The maximum continuous speed is 20kt in 4m seas. The ships can withstand wind gusts of 150kt during light ice conditions and operate in all sea conditions at speeds of 4kt to 5kt. The ships have an endurance of 8,300nm at varying speeds with a 10% fuel reserve.
The integrated information system is based on a digital fibre-optic switched system with digital multipurpose subscriber stations, which handles all internal and external communications, including data link and message handling for the ship's Command, Control and Communications (C3) system, supplied by Terma Elektronik of Lystrup, Denmark.
The armament consists of one Oto Melara 76mm Super Rapid main gun, one or two 20mm guns from Oerlikon and depth charge throwers. The Super Rapid gun has a rate of fire of 120 rounds a minute and range of 16km. The fire control system is the Saab Systems 9LV 200 mk3. A FLIR Systems Inc AN/AAQ-22 SAFIRE thermal imaging system is used for surveillance.
There is a landing deck with a landing spot for a single helicopter. Helicopter support arrangements include a Glide Path Indicator (GPI) and a flight refuelling system. The hangar is equipped for helicopter maintenance and has the capacity for a Lynx helicopter without having to fold the helicopter tail.
The frigates are fitted with a BAE Systems AWS-6 air and surface search radar operating at G band, a Terma Scanter Mil surface search radar operating at I band, a Furuno FR-1505 DA navigation radar operating at I band and a Saab Systems 9LV mk3 fire control radar operating at I and J bands.
Sonar equipment consists of a Saab Systems hull-mounted type CTS 36 RDN and a Thales Underwater Systems (formerly Thomson Marconi) TMS 2640 Salmon Variable Depth Sonar (VDS).
The bow and azimuth thruster are produced by Brunvoll A/S. There is also a shaft generator of 1,500kW, supplied by Volund Motorteknik A/S, and three GM diesel motors with Volund Teknik generators, each with an output of 480kW.
The vessel can sail with unmanned engine rooms, the entire installation being controlled, and visually supervised from the bridge or from other locations in the ship.
Length 369 ft, Beam 47 ft, Draught 20ft, Displacement Full 3,500 t
Maximum Continuous Speed 20 kt, Endurance 8,300 nm, Provisions 4 months.
Picture added on 19 June 2008
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Svendborg Værft A/S, Denmark

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