Van Speijk-class frigate

Last updated

HNLMS Evertsen (F815).jpg
HNLMS Evertsen (F815) in the 1980s.
Class overview
NameVan Speijk class
Builders
Operators
Preceded by Van Amstel class
Succeeded by Kortenaer class
Subclasses Ahmad Yani class
Built1963–1968
In commission1967–1989 (Royal Netherlands Navy)
Completed6
Retired6 (all sold to Indonesia)
General characteristics
Type Frigate
Displacement2,200 tons standard, 2,850 tons full load
Length113.4 m (372 ft 1 in)
Beam12.5 m (41 ft 0 in)
Draught5.8 m (19 ft 0 in)
Propulsion
  • In Dutch service
    • 2 x geared steam turbines
    • 22,370  kW (30,000  shp)
    • 2 x shafts
Speed28.5 knots (52.8 km/h; 32.8 mph)
Range4,500  nmi (8,300 km; 5,200 mi) at 12 kn (22 km/h; 14 mph)
Complement
  • "before rebuild" 254,
  • "after rebuild" 180
Sensors and
processing systems
  • Radar: "as built" LW-02, DA-02, M45, "after rebuild" LW-03, DA-05, M45, M44[ citation needed ]
  • Sonar: Types 170B, 162
  • Combat system: SEWACO V
Armament
Aircraft carried1x Westland Wasp, later replaced by Westland Lynx
Aviation facilities Hangar

The Van Speijk-class frigates were built for the Royal Netherlands Navy in the 1960s. They were versions of the British Leander-class frigates with Dutch radars. The British design was chosen in order to enable rapid construction in order to replace elderly destroyer escorts and take up part of the NATO patrol duties of the decommissioned anti-submarine warfare carrier Karel Doorman. The ships were modernised in the late 1970s. All six ships were sold to the Indonesian Navy in 1986–1989 and five are still in service as the Ahmad Yani-class frigates .

Contents

Dutch modifications

Van Nes and Van Galen under construction in 1966. Bouw fregatten Van Speijkklasse bij Koninklijke Maatschappij De Schelde. Naast elkaar aan de afbouwkade, links de Van Nes en rechts de Van Galen (2173-307-030).jpg
Van Nes and Van Galen under construction in 1966.

For the most part the Dutch limited their changes to the Leander design to a wholesale replacement of the original British electronics and electrical equipment by those from Dutch manufacturers. Hollandse Signaalapparaten supplied the entire electronics suite. Specifically their LW-02 long-range air-surveillance radar, the DA-02 medium-range air/surface search radar and the M45 combined radar and optical fire control system for the 4.5 in (110 mm) guns. The Dutch HSA M44 radar/visual director for the Seacat anti-aircraft missiles could automatically target in elevation and bearing and because of its much lighter weight, allowed the single Seacat launcher on the British ships to be increased to two launchers on the Dutch ships, each with their own director. [1]

Mid-life modernization

Beginning in December 1976 each of the Dutch ships was given a mid-life modernization that took about two years to finish. The twin 4.5-inch turret was replaced by a single OTO Melara 76 mm gun and two quadruple mounts for Harpoon anti-ship missiles were fitted abaft of the funnel. The Mk 10 Limbo ASW mortar was replaced by a pair of triple Mk 32 torpedo launchers, one mount on each side of the hangar, and its mount plated over so the flight deck could be increased to allow the ship to carry the larger Westland Lynx helicopter in lieu of the Wasp carried earlier. The removal of the variable-depth sonar from the quarterdeck to the interior of the stern also allowed more room for the flight deck. [2]

The electronics were also upgraded, the LW-02 radar was exchanged for a LW-03 and the DA-02 was replaced by a DA-05 radar. Most importantly an automated combat management system, SEWACO V, was fitted to aid the ship's captain in decision making. Its power plant was also extensively automated. All told these changes allowed the crew to decrease in size from 254 to about 175 which allowed greatly increased standards of habitability. [2]

Ships

All ships were named after Dutch naval officers. [1] When sold to Indonesia, they were named after Indonesian National Armed Forces heroes.

NamePennant NumberBuilderLaid downLaunchedCompletedFate
Van Speijk F802 NDSM, Amsterdam1 October 19635 March 196514 February 1967Sold to Indonesia in 1986 as Slamet Riyadi (352), an Army Lieutenant Colonel killed in Fort Victoria, Maluku
Van Galen F803 KM de Schelde, Vlissingen25 July 196319 June 19651 March 1967Sold to Indonesia in 1987 as Yos Sudarso (353), a Navy Commodore killed in Battle of Aru Sea
Tjerk Hiddes F804NDSM, Amsterdam1 June 196417 December 196516 August 1967Sold to Indonesia in 1986 as Ahmad Yani (351), an Army General killed in the 1965 coup d'état
Van Nes F805KM de Schelde, Vlissingen25 July 196526 March 19669 August 1967Sold to Indonesia in 1986 as Oswald Siahaan (354), a Navy hero killed in Battle of Sibolga Bay
Isaac Sweers F814NDSM, Amsterdam5 May 196510 March 196715 May 1968Sold to Indonesia as Karel Satsuitubun (356), a Police officer killed in 1965 PKI's coup d'état
Evertsen F815KM de Schelde, Vlissingen6 July 196518 June 196621 December 1967Sold to Indonesia in 1989 as Abdul Halim Perdanakusuma (355), an Air Force hero

Indonesian service

KRI Karel Satsuitubun in 2006. Indonesia Frigate KRI Karel Satsuit Tubun.jpg
KRI Karel Satsuitubun in 2006.

At least some, if not all, of the Indonesian ships have replaced their Seacat launchers with two twin Simbad launchers. [3] Recently, the two quadruple Harpoon launchers were also replaced by Yakhont missile (SS-N-26) launchers purchased from Russia, because the early version Harpoon missiles previously installed were nearing their obsolescence period. There are also some conflicting reports that the Harpoon missiles were replaced with Chinese-sourced C-802 rather than Russian Yakhont. There are some pictures circulating on the internet showing several vessels of the class carrying box launchers that look much too small to be Yakhont's launchers, but they are the right size for C-802.

Pictures released in March 2011 show that modifications were made to KRI Oswald Siahaan with 4 SS-26 Yakhont VLS cells located in the quarterdeck beside the helicopter hangar. [4]

Engine replacement

In Indonesian service, the Van Speijk class is known as the Ahmad Yani class after the lead ship. All were named after Indonesian Armed Forces heroes. Between 2003 and 2008, all vessels of the Ahmad Yani class had their existing steam turbine engines replaced with diesel propulsion. [5]

Engine/GearboxPowerReplacement dateShipyardShips
2 x Caterpillar CAT DITA 3616, Reintjes WAV 1000 P gearboxes16,000 hp (12,000 kW)2007–2008PT Tesco351, 352, 353, 355
2 x Caterpillar CAT DITA 3612, Reintjes WAF 4566 gearboxes12,000 hp (8,900 kW)2003PT Tesco356
2 x SEMT Pielstick 12PA6B, Renk SWUF 98 gearboxes11,800 hp (8,800 kW)2006PT PAL/PT Mulia354

Notes

  1. 1 2 Adams, p. 193
  2. 1 2 Adams, p. 194
  3. ↑ Wertheim, Eric (2007). The Naval Institute Guide to Combat Fleets of the World: Their Ships, Aircraft, and Systems (15th ed.). Annapolis, MD: Naval Institute Press. p. 308. ISBN   978-1-59114-955-2.
  4. ↑ "Official Images from Antara Foto on the Yakhont VLS on KRI Oswald Siahaan".
  5. ↑ "UPGRADES AND REFITS, Indonesia (Indonesia), UPGRADES AND REFITS". Jane's Naval Construction and Retrofit Markets. 11 March 2008. Retrieved 27 November 2008.[ dead link ]

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References

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