Furtive class frigate
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| File:Furtive class frigate.png | |
| Class overview | |
|---|---|
| Name: | Furtive class frigate |
| Builders: | Royal Shipyards of Isselmere-Nieland |
| Operators: |  Royal Isselmere-Nielandic Navy |
| Preceded by: | Eager class frigate |
| Succeeded by: | Bullfinch class frigate |
| Subclasses: | Gargoyle |
| Cost: | $530 million |
| Built: | 1998 |
| In commission: | 2003—2005 |
| General characteristics | |
| Type: | Helicopter frigate |
| Displacement: | 5700 tonnes full load |
| Length: | 130 m waterline 138.7 m overall |
| Beam: | 16.1 m overall |
| Draught: | 4.85 m keel 6.35 m sonar dome |
| Ice class: | PC 6 |
| Propulsion: | 2 IMW MTG-6 gas turbines 2 IMW MGD-23 86 MW, 2 shafts |
| Speed: | 30+ knots |
| Range: | 4500 nmi. |
| Endurance: | Crew: 90 days |
| Boats and landing craft carried: |
2 RHIB |
| Complement: | 125 |
| Electronic warfare and decoys: |
EPM/ESM: MLR.165 signals R/DF, MLQ.177 jammer, MLR.184 LWR, MWD.199 signals DF |
| Armament: | Guns: 76mm OTO-Melara 76 mm Missiles: 48-cell MSE-33, 2 × MWS-1 gun-missile complexes Torpedoes: 2×3 324mm torpedo tubes |
| Armour: | Splinter protection over magazines and other key areas |
| Aircraft carried: | Cormorant HM.2 |
| Aviation facilities: | Flight deck and hangar |
The Furtive-class helicopter frigate (FFH) was the standard escort vessel of the Royal Isselmere-Nielandic Navy from 1998 to 2005. To operate independently in low to medium risk areas, the design had long range volume search and multifunction radars, dual mode hull-mounted and passive towed sonar arrays, area air defence and medium anti-ship missiles, and a dual purpose gun capable of effective naval gunfire support. Although about twice the size of the frigates it replaced, the Furtive class had a similar crew complement due to extensive automation.
Allowance was made in the design to upgrade its main gun from 76 mm to either a 62-calibre 127 mm naval rifle or a 52-calibre 155 mm gun. All Furtives in Isselmere-Nielandic service retained the 76 mm gun.
Contents |
Structure
The basic design for the Furtive-class was of a 4000-ton vessel with a light automated gun (57 mm to 100 mm), a single-function vertical launch system (VLS) for short-range air defence missiles, a large bow-mounted dual mode sonar, a long-range surface and air volume search radar, and a multifunction radar array capable of tracking and targeting at least 100 targets. The Admiralty viewed the planned maritime patrol helicopter, equipped with both dipping sonar and sonobuoys, as a suitable alternative to the variable depth sonar that was subsequently omitted from the preliminary design to save tonnage, length, and money. Diesel-electric motors for cruise propulsion and power generation were economical but noisy, requiring extensive work to minimise the ship's acoustic signature. A large hull-mounted sonar array required a stable, quiet ship.
As the spectrum of threats grew, so did the design. The 32-cell lightweight VLS became a 48-cell Standard VLS and the gun mount was capable of fitting a 155 mm smoothbore gun to fire extended range guided munitions (ERGM). A towed array sonar complemented the 15-tonne class anti-submarine helicopter, as did the two automated triple lightweight torpedo mounts and new torpedo defence systems. Likewise, the rest of the ship's sensor suite grew to fill out the larger hull.
The class has an all-steel construction with ballistic polymer protection over key areas, notably the operations centre, magazines, and machinery spaces. The hull was relatively broad in beam for stability, although two long bilge keels and two stabilisers (one each side) were added for insurance.
Missiles
Despite the relatively small size of the initial design, the Director of Naval Construction ordered the fitting of the Standard Vertical Launch System (MSE-33) rather than the much shorter Basic (MSE-34) variant, requiring a raised platform to fit the four eight-cell, 8 m-high modules, allowing the ship to fire the GWS.41 Loon anti-submarine missile as well as the GWS.57 Erne surface-to-air missile.
At a late stage, the MSE-37 Common Point Defence Missile System (CPDMS) was to replace the planned MWS-1 Combined Weapon Station gun-missile mount.[1] Unlike the MSE-33, the MSE-37 was a 16-cell cold launch VLS, designed to fire short-range anti-submarine and surface-to-air missiles. In the end, Gebbeck Shipbuilding fit both systems into the ship, requiring the removal of the two 30 mm remote weapon stations.
Proposed design
Type: Frigate
Displacement: 4,900 tons
Crew: 185 maximum
Weapons
- AAW: 32-cell MSE-34 Basic VLS (fore), MCV-1 30 mm remote weapon station (fore), Mark 49 RIM-116 RAM (atop hangar)
- ASuW: 2 × Mark 141 4-cell launcher
- ASW: 2×3 Mark 32 Surface Vessel Torpedo Tubes
- GP: OTO-Melara 76 mm gun (A position)
Aircraft: Capable of deploying a Cormorant HM.2 helicopter
Electronic suite
- tba
Countermeasures: Seagnat 130 mm decoy launcher, SLQ-25 Nixie anti-torpedo decoy
Cost: Ƿ 917 million - $530 million
Production time: 3 years
Batch 1
Type: Frigate
Displacement: Normal: 5141 t; full: 5631 t
Dimensions: length: 130 m (waterline), 138.7 (overall); beam: 16.1m; draught: 4.85 m (keel), 6.35 m (sonar dome)
Propulsion: 1-shaft CODOG-IFEP with bow thruster; 2 gas turbines (Isselmeric Motor Works MTG-6F) and 2 auxiliary diesels (IMW MMD-23); 85.8MW = 34.23 kts.
Crew: (standard): 96 (excluding flight crew); 125
- Protection
- Main belt: 50 mm
- Barbette: 50 mm
- Main missile magazine: 50 mm
- Hangar: 30 mm
- Deck (key spaces): 30 mm
- CIC: 50 mm
Weapons
- AAW: 2 × MSE-37 Common Point Defence System (C position), 48-cell MSE-33 Standard VLS (B position), 2 × MWS-1 Remote Weapon Station (port-starboard)
- ASuW: 2-4 × 4-cell MSE-32 fixed angled missile launchers (port-starboard)
- ASW: 2 × 3 324mm MST-31 torpedo tubes (port-starboard)
- GP: 100-130 mm gun (A position)
- Vehicles
Two Salamander-type rigid hull inflatable boats.
One Cormorant HM.2-sized helicopter; equipped with the "beartrap" helicopter recovery system.
- Electronics suite
- Computer complex: MEI.5 Muninn/MEI.4 Mimir (ISOMS)
- Threat management systems: MEQ.181 NAIADS (anti-air), MEQ.185 SELKIE (anti-torpedo), MSX.193 MITRE (target recognition)
- Radars: MRU.113 Huginn/MRU.110(V)2 Raven (multifunction), MRS.118 Kafka/MRS.111(V)2 Jackdaw (air volume search), MRN.116 Beluga (navigation), MRS.164 Hofvarpnir (surface search), MRG.182 Balmung (gunnery fire control)
- Optronics: MSU.124 Adder (long range multifunction), MSS.127 Owl (surface surveillance)
- Combination radar/optronics: MSP.133 Tuesday (helicopter landing system), 4 × MSG.183 Gjallar (close range fire control)
- Sonars: MQU.134 Fenris (keel-mounted, MF/LF), MQS.145 Herring (variable depth)
- ECM: MLR.165 (radar/signals emissions receiver and direction finder), MLQ.177 (jammer), MPR.184 Nott (laser warning receiver and direction finder), MRD.199 (signals direction finder)
- Communications: HSQ.117(V)2 Godi (Link 17.2; secure datalink), MSC.121 Alvis (secure satellite communications system), SSW.125(V)2 Ran (Link 17.2G; secure missile guidance datalink), 2 × NQC.128(V)2 Dvalin (Link 17.2U; encrypted acoustic modem), SRC.178 (secure communications system), MPC.190 (laser communications transceiver), JSC.196M (encrypted burst communications transceiver).
- Countermeasures: 2 × MSL-39 anti-missile decoy buoy launchers, 2 × MSL-40 81 mm anti-missile countermeasures, 2 × MSL-42 130 mm anti-missile countermeasures, MTL-35/SUL-8 towed anti-torpedo decoy.
Cost: Ƿ 312 million; $500 million USD
Production time: 2 years
Production capacity: 48 ships
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