Flyvefisken-class patrol vessel

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Flyvefisken class P555 Støren
P555 HDMS Støren
Class overview
Operators:  Royal Danish Navy
 Lithuanian Naval Force
Built: 1985–1995
In commission: 1989–
Planned: 17
Completed: 14
Cancelled: 3
Active: 4
Retired: 10
General characteristics [1]
Displacement: 320 tonnes (315 long tons) light
450 tonnes (443 long tons) full load
Length: 54 m (177 ft 2 in)
Beam: 9 m (29 ft 6 in)
Draught: 2.5 m (8 ft 2 in)
Propulsion: Combined diesel and gas
1 × General Electric LM500 gas turbine 4,066 kW (5,453 hp)
2 × MTU 16V 396TB94 diesels 4,226 kW (5,667 hp) total
1 × auxiliary GM 12V-71 diesel, 373 kW (500 hp) Hydraulic propulsion
3 × auxiliary GM 6-71 diesel generators
Speed: 30 knots (56 km/h; 35 mph) on turbine + diesels
20 knots (37 km/h; 23 mph) on MTU's
7 knots (13 km/h; 8.1 mph) on hydraulic drive
Range: 3,860 nmi (7,150 km) at 18 kn (33 km/h; 21 mph)
Complement: 19-29 depending on role
Sensors and
processing systems:
Terma Scanter Mil 009 surveillance radar
Thales TMS 2640 Salmon variable depth sonar
Furuno navigational radar
EADS TRS-3D air search radar (Combat role)
Plessey AWS-6 air search radar (MCM role)
SaabTech Vectronics 9LV 200 Mk 3 Fire control radar
Armament: Armament depends on the ships role, but includes the following options:
8 × launchers for Boeing RGM-84 Harpoon Block II SSM
12 × launchers Sea Sparrow SAM
1 × OTO Melara 76 mm/62 gun
2 × 12.7 mm machine guns
4 × 323 mm (12.7 in) MU90 ASW torpedoes
60 mines
HDMS Viben (P562).
Patrol vessel employed by Lithuanian Naval Force

The Flyvefisken class patrol vessels ((Danish): Flying fish) are warships of the Royal Danish Navy. The class is also known as the Standard Flex 300 or SF300 class.

Containerised weapon systems[edit]

The Flyvefisken ships were constructed using an innovative modular design known as StanFlex: they have a standard hull in which containerised weapons or systems can be placed. This allows them to rapidly change roles, typically in 48 hours. This enables the ships to be configured to perform the following roles:

  • Surveillance/pollution control
  • Combat
  • Mine countermeasures/minehunter (MCM)
  • Minelayer

The containers measure 3.5 × 3 × 2.5 metres. One container goes on the foredeck; the other three go on the quarterdeck behind the superstructure and funnel. Furthermore the ships are built using the sandwich principle - a layer of fiberglass either side of a core of PVC cell foam. This forms the structure from keel to top of mast. This building method has reduces maintenance costs - so much so that 20 years on the new Diana and -Holm class have been built using the same materials.[2]

Replaced three different vessels[edit]

The Flyvefisken class replaced three different vessels in the Danish Navy: Six torpedo boats of the Søløven class (1965–90), six coastal minesweepers of the Sund class (1955–99) and eight seaward defence craft of the Daphne class (1961–91). It was possible because of the containerised systems and modern technology.

The replaced vessels used World War II (or WWI) tactics: The Søløven boats were light plywood boats propelled by three turboshafts, which attacked the enemy ships with torpedoes in 54 knots hit-and-run attacks. The Flyvefisken class is not that fast, but their Harpoon missiles are sufficient for the task.

The Sund class (Adjutant class minesweepers) were built of wood, bronze and other non-magnetic materials. They swept mine fields by trawling through the area with paravanes on tow separating magnetic and acoustic generators for the bottom mines, and chain cutters for the horned mines. The Flyvefisken class is a minehunter and locates the mines with side-scan sonar and neutralize them one by one with a ROV.

The Daphne class attacked submarines by dropping depth charges to a preselected depth, while sailing past the submarine. The Flyvefisken class fights submarines with anti-submarine homing torpedoes.

Ships in class[edit]

A total of 14 ships were built in the class, in three series:

Name Laid down Launched Commissioned Decommissioned Int. Callsign Role
Series 1
P550 HDMS Flyvefisken
(Flying fish)
15 August 1985 26 April 1986 19 December 1989 - a) LVS Zemaitis (P 11) OVDA MCM
P551 HDMS Hajen
(Shark)
February 1988 6 August 1989 19 August 1990 - a) LVS Dzukas (P 12) OVDB MCM
P552 HDMS Havkatten
(Catfish)
August 1988 13 January 1990 1 November 1990 12 January 2012 OVDC MCM
P553 HDMS Laxen
(Salmon)
March 1988 20 May 1990 12 March 1991 7 October 2010 OVDD MCM
P554 HDMS Makrelen
(Mackerel)
December 1988 8 January 1991 4 October 1991 7 October 2010 OVDE MCM
P555 HDMS Støren
(Sturgeon)
August 1989 1 September 1991 24 April 1992 7 October 2010 OVBF MCM
P556 HDMS Sværdfisken
(Swordfish)
- 1 September 1991 1 February 1992 2 August 2006 OVDG MCM
Series 2
P557 HDMS Glenten
(Kite)
- 1992 1 February 1992 7 October 2010 OVDH Combat
P558 HDMS Gribben
(Vulture)
- 1992 1 July 1993 7 October 2010 OVDI Surveillance
P559 HDMS Lommen
(Loon)
- 1993 21 January 1994 - a) LVS Aukstaitis (P 14) OVDJ Surveillance
P560 HDMS Ravnen
(Raven)
- 1994 7 October 1994 7 October 2010 OVDK Combat
P561 HDMS Skaden
(European Magpie)
- 1994 10 April 1995 7 October 2010 OVDL Combat
P562 HDMS Viben
(Northern Lapwing)
- 1995 15 January 1996 7 October 2010 OVDM Combat
Series 3
P563 HDMS Søløven
(Sea lion)
- 1995 27 May 1996 - OVDN Surveillance

a) = Sold to Lithuania, March 2007

The difference between the series is mainly in the configuration of the propulsion system. Series 2 is not equipped with hydraulic propulsion, but instead has an additional auxiliary engine, and Series 3 has one further auxiliary engine.

References[edit]

  1. ^ "Specifications: Flyvefisken Class (SF 300) Multi-Role Vessels - Naval Technology". www.naval-technology.com. Retrieved 2009-11-26. 
  2. ^ "Flyvefisken Class (SF 300) Multi-Role Vessels - Naval Technology". www.naval-technology.com. Retrieved 2009-11-26. 

External links[edit]