Thetis / Stanflex 3000
Danish Thetis class multi-role frigate used for fishery protection, surveillance, air-sea rescue, anti-pollution and ice reconnaissance.
The armament consists of one Otobreda 76 mm Super Rapid main gun, one or two 20 mm guns from Oerlikon, and depth charge throwers. The Super Rapid gun has a rate of fire of 120 rounds per minute and a range of 16 km. The fire control system is the CelsiusTech 9LV 200 Mk 3. A FLIR Systems Inc AN/AAQ-22 SAFIRE thermal imaging system is used for surveillance. All weapon and equipment systems are connected through the frigates' command, control and communications system.
The frigate has 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 capacity to hold a Lynx helicopter without having to fold the helicopter tail. The hangar is fitted with a full width door.
The frigate has a double-skinned hull up to two metres above the water-line. The hull is divided by ten bulkheads into watertight compartments such that the vessels are able to sustain hull damage up to eight meters in length without dangerous instability problems. For ship propulsion, one engine-room and the gear- room can be water-filled at the same time, and the frigates will still be able to proceed. The basic hull shape corresponds to that of a high-speed trawler. The frames in the bow and stern are very closely spaced. Amidships the thickness of the outer skin has been increased.
The propeller is protected against ice by a bulb in the stern There are no bilge keels, but stabilisation is achieved by a combination of fin stabilizers from Blohm and Voss and a controlled passive tank system supplied by Intering. To minimise ice formation on the superstructure, all winches, capstans, etc. are placed under deck. The forecastle deck is trawler shaped and all open deck spaces and scuppers are heated. The allowed amount of icing is 375 tons.
The propulsion machinery consists of three MAN B&W V28/32 diesel engines with combined power of 9000 kW, fitted in two separate watertight compartments on each side of the gear compartment. The reduction gear box is able to operate under water. The fitted bow thruster is able to hold the bow against an athwartship wind of 28 knots. A retractable azimuth thruster is capable of propelling the ship at 10 knots, and can be considered as an emergency machinery set in case of damage to propeller or gears or total engine failure. A shaft generator of 1500 kW is located in the forward engine room, and there are three GM Detroit diesel motors with Volund Teknik generators, each with an output of 480 kW, installed with one in the forward and two in the aft engine room. An 127 kW emergency diesel generating set is fitted in a compartment under the forecastle deck. The ship has an endurance of 8300 nautical miles at varying speeds with a 10 per cent fuel reserve.
Provisions cover 4 months' operations, and the stocks of spare parts are sufficient for 6 months at sea without replenishment. Helicopter fuel suffices for 150 flying hours. The frigate is ice strengthened and is able to proceed through 80 cm of solid ice. The hull has an icebreaking bow and stem lines suitable for operations in ice with only one propeller. Maximum continuous speed is 20 knots in four meter seas. The seakeeping qualities allow the ship to stand up to wind gusts of 150 knots during light ice conditions and operate in all sea conditions at speeds of 4-5 knots.
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