PDA

View Full Version : New HPV, my vote



Simon Jennings
16th March 2003, 14:31
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.




Specifications
Thetis
Country DENMARK
Displacement 3500 t
Length 122.50 m
Beam 14.50 m
Draft 6.00 m
Speed 21 kts
Crew 65
Propulsion 3 diesels, 1 shaft, 6366 hp
Armament 1 76 mm OTO gun
1 20 mm gun
2 DC racks

Helicopters 1 Lynx

EagleEye
16th March 2003, 15:23
By all accounts she is a fine ship, just what we need. Requires only a small crew as well. Good choice Simon.

hptmurphy
17th March 2003, 00:01
yeh yeh the all new improved eithne class for use in the artic with minimal crew.What was the last yacht you served on?

try again. how do you work a three watch system ? when do the crew get any time off? A 3500 tonne vessel with a mini crew under naval crewing condititions .....who runs it ... who maintains it ...who fights it.... wake up.Ships of this size need max crews to operate.Ships don't go to sea by them selves ...Simon take aweek off and live the life....build the ships as u like but find the bdies to operate them first.

Little Legionnare
17th March 2003, 01:04
Since the THetis allows additional armerment in it's hull, wouldn't you want to considerer that (Aster, Excet bock 3). And would you have oner or two or more?

Simon Jennings
17th March 2003, 15:58
Having worked a three watch system with 3 officers, it does work, not that its not hard.
The biggest problem apparently with the NS is personnel.
56 crew on a 3,500 crew vessel, with 6 deck officers and 4 engineers would be more than enough for fisheries patrol.

hptmurphy
18th March 2003, 01:17
Fine if you want pure fisheries patrol but please take into account the other roles undertaken by the NS.Arms interdiction ...drug smuggling...Sar ..and general coastal protection ...not very viable for a force that is reduced to basic civil watch systems .Quite viable for the likes of the US coast guard but for a service that promotes its elf as a modern naval service totally impossible.the two jobs may have many crossovers but Naval force projection is at odds with coast guard work its a case of either or.The government will have to make up their mind which they want Either a naval service Or a Coast guard.

Simon Jennings
19th March 2003, 16:09
The vessel has the growth potential to grow from the coast guard role to the naval service role with the standard flex system, with a very clever and sound contaainerised system.
The day to day duty of the NS is that of a coast guard, so lets build on that, and as it develops the capability and role of the vessel grows.