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Sigma-class corvette
KRI Diponegoro on sea trials in Holland in April 2007. Photo courtesy of Mr Wim Kosten,
Sigma Class Corvette
Class overview
Builders: Schelde Naval Shipbuilding
Operators:  Indonesian Navy
 Royal Moroccan Navy
Subclasses: 9113 (Indonesian corvette variant), 9813 (Moroccan heavy corvette variant), 10513 (Moroccan light frigate variant), 10514 (Indonesian frigate variant)
Planned: 11
Completed: 7
Active: 7
General characteristics
Type: Corvette or Frigate
Displacement: 1,692 tons
Length: 90.71 meters (297.62 feet)
Beam: 13.02 meters (42.72 feet)
Draft: 3.60 meters (11.81 feet)

2 x SEMT Pielstick 20PA6B STC rated at 8910 kW each driving a lightweight Geislinger coupling combination BE 72/20/125N + BF 110/50/2H (steel - composite coupling combination)
4 x Caterpillar 3406C TA generator rated at 350 kW each
1 x Caterpillar 3304B emergency generator rated at 105 kW
2 x shaft with Rolls Royce Kamewa 5 bladed CP propeller

2 x Renk ASL94 single step reduction gear[1] with passive roll stabilization

Maximum: 28 knots (52 km/h)
Cruising: 18 knots (33 km/h)

Economy: 14 knots (26 km/h)

At cruising speed of 18 knots (33 km/h): 3,600 Nm (6,700 km)

At economy speed of 14 knots (26 km/h): 4,800 Nm (8,900 km)
Complement: 20, up to 80
Sensors and
processing systems:

Combat System: Thales Group TACTICOS[2] with 4 x Multifunction Operator Console Mk 3 2H
Search radar: MW08 3D multibeam surveillance radar
IFF: Thales TSB 2525 Mk XA (integrated with MW08)
Navigation radar: Sperry Marine BridgeMasterE ARPA radar
Fire control radar: LIROD Mk 2 tracking radar
Data Link: LINK Y Mk 2 datalink system
Sonar: Thales UMS 4132 Kingklip medium frequency active/passive ASW hull mounted sonar
Internal Communications: Thales Communication's Fibre Optical COmmunications Network (FOCON) or EID's ICCS where on-board users have access to internal and/or external communication channels and integrated remote control of communications equipment
Satellite Comms: Nera F series
Navigation System: Raytheon Anschutz integrated navigation

Integrated Platform Management System: Imtech UniMACs 3000 Integrated Bridge System[3]
Electronic warfare
& decoys:

ESM: Thales DR3000
ECM: Racal Scorpion 2L

Decoy: TERMA SKWS, DLT-12T 130mm decoy launchers, port, starboard

Anti-air missile: 2 x quad MBDA Mistral TETRAL, forward & aft
Anti-surface missile: 4 x MBDA Exocet MM40 Block II
Guns: Oto Melara 76 mm (A position)

2 x 20 mm Denel Vektor G12 (Licensed copy of GIAT M693/F2) (B position)
Torpedoes: EuroTorp 3A 244S Mode II/MU 90 in 2 x B515 launchers
Aviation facilities: landing pad, optional hangar

The Sigma class corvette is a corvette or frigate with ocean capabilities.

Modular design

The basic design of the Sigma Patrol Series can vary as the hull segments are designed as components. Ships can vary in the number of hull segments and in the order in which they are placed. Sigma stands for Ship Integrated Geometrical Modularity Approach. The ship's main dimensions are named in the types itself, SIGMA 9113 stands for 91 meters long and 13 meters wide, same is with the SIGMA 10513, 105 meters in length and 13 meters wide.

The design was derived from the earlier High Speed Displacement hull form by MARIN Teknikk AS in the 1970s.


  • Indonesia has four 9113 class corvettes in active service by 2009 and in August 2010 has signed a deal to build frigate PKR 105 based on SIGMA 10514 in PT PAL Shipyard Indonesia, a second contract was signed in February 2013.
  • Morocco has ordered two 9813 class heavy corvettes (with VLS) and a light 10513 class frigate based on a modified design.

Potential Users

  • Vietnam has negotiated four SIGMA in October 2011 by Prime Minister Nguyen Tan Dung's visiting to Netherlands. The Dutch Schelde shipyard in Vlissingen, Netherlands will build four Sigma corvettes for the Vietnamese Navy. The first two ships will be built in Vlissingen, and the last two will be built in Vietnam, under Dutch supervision.[4]
  • Oman had an interest in buying four SIGMA corvettes/frigates in March 2011. The Dutch queen Beatrix planned a state visit to Oman, one of the reasons for the visit was the sale of the ships to the Royal Navy of Oman.The official visit was cancelled due to the unrest in Oman at the time, she did go to an unofficial dinner with the sultan of Oman. The official visit took place later in January 2012. During the first visit to Oman the Royal Netherlands Navy sent its air defence warfare frigate HNLMS De Ruyter (F804) to Muscat.
  • Philippines The Damen Schelde shipyard reportedly join and might offered Sigma class Light Frigate version for the bidding of Philippine Navy 2 brandnew frigate requirements, but no other information added.[5]

Indonesian variants

SIGMA 9113

The Indonesian variant is based on the Sigma 9113 design.[6] Work on the first of the class, KRI Diponegoro, began with the first steel cutting conducted in October 2004. The ship was christened on September 16, 2006 and commissioned on July 2, 2007 by Admiral Slamet Soebijanto, Indonesian Navy Chief of Staff.[7]

Options for 2 other units were exercised on January 2006 with the first steel cut commenced on 3 April 2006[8] in Damen's Schelde Naval Shipbuilding yard, Vlissingen-Oost yard and not in Surabaya stated earlier.

In 28 August 2007, Jane's Missiles and Rockets reported[9] that Indonesia was having problems securing the export license for the MM-40 Exocet block II and are considering Chinese made C-802 anti-ship missiles as alternatives. However, the ships have already been delivered with the Exocet missiles.

SIGMA 10514

On the 16 August 2010, Indonesia Defense Department, signed a deal[10][11] with PT PAL Indonesia and Damen Schelde to build a 105 meters frigate in Indonesia based on Damen Schelde Sigma 10514 design. The frigate will be equipped with 76mm Main Canon, 12 MICA vertical launch air defence missile, MM-40 Exocet block II, Torpedo, phalanx and SMART-S MK2 radar system. Though the Indonesian Navy announced that it will build four destroyer escorts referring to the SIGMA 10514. On the Indo Defence 2012 exposition a model was revealed showing the phalanx and ASW mortar replaced by a single 35 mm Oerlikon Millennium Gun system,[12] also the 76mm had a stealth cupola. Some reported that the VLS missiles will be Aster-15 instead of MICA, due to these changes the ships role also changed from ASW to AAW.

On February 1, 2013 it was announced that a second unit will be build by Damen Schelde Naval Shipbuilding and PT PAL Surabaya, the second contract includes torpedo tubes, combat control room and a couple of surface weapons.25[13][14][15][16]

Moroccan variants

On February 6, 2008,[17] Morocco signed a USD$1.2 billion contract with Schelde Naval Shipbuilding for two Light frigate SIGMA 9813 and one Light frigate SIGMA 10145 which are modified versions of the existing SIGMA Class design.

A subsequent contract was signed[18] on the April 1, 2008 with Thales Nederland for the supply and installation of the command and control and sensor package for the ships. The package included TACTICOS combat management system, SMART-S Mk2 surveillance radar, LIROD Mk2 tracking radar, Thales KINGKLIP sonar system, IFF system, Integrated communication system comprising external communication system and FOCON internal communication system, two Target Designation Sights, VIGILE ESM system, SCORPION ECM system, and the integrated navigation system.

The first frigate for Morocco, Tarik ben Ziyad, was launched in July 2010,[19] began sea trials on 6 May 2011[20] and was delivered on 12 September 2011.[21] The second ship was launched on 2 February 2011,[19] with sea trials planned for late in the year.[20] The third ship was planned to be launched in September 2011.[20]

Ships of class

TNI-AL / Sigma 9113 design

Name Pennant Laid Down Launched Commissioned Note on Ship's Name
KRI Diponegoro 365 24-Mar-2005 16-Sep-2006 5-Jul-2007 Prince Diponegoro, a National Hero from Central Java
KRI Sultan Hasanuddin 366 24-Mar-2005 16-Sep-2006 24-Nov-2007 Sultan Hasanuddin, a National Hero from South Sulawesi
KRI Sultan Iskandar Muda 367 8-May-2006 24-Nov-2007 18-Oct-2008 Sultan Iskandar Muda, a National Hero from Aceh
KRI Frans Kaisiepo 368 8-May-2006 28-June-2008 7-Mar-2009 Frans Kaisiepo, a National Hero from Papua and the fourth Governor of Papua

TNI-AL / Sigma 10514 design

Name Pennant Laid Down Launched Commissioned Note on Ship's Name
tba tba January 2013 tba tba tba
tba tba tba tba tba tba

Moroccan Navy / Sigma 9813 & 10513 design

Name Pennant Laid Down Launched Commissioned
Tarik Ben Ziyad 613 15-Apr-2009 12-July-2010[22] 10-Sep-2011[23]
Sultan Moulay Ismail 614 Mar-2009 04-Feb-2011[24] 10-Mar-2012[25]
Allal Ben Abdellah 615 Sep-2009 Oct-2011 08-Sep-2012[26]

Note: 613 now shows on AIS as Sultan Moulay Ismail.

Sigma versions

Simplified comparisons between the different Sigma models.

Specifications Sigma 9113 Sigma 9813[27] Sigma 9814[28] Sigma 10513[29] Sigma 10514[30][31]
Ordered by  Indonesian Navy  Royal Moroccan Navy  Vietnamese People's Navy  Royal Moroccan Navy  Indonesian Navy
Length 90.01 meters 97.91 meters 98.00 meters 105.11 meters 105.11 meters
Beam 13.02 meters 13.02 meters 14.02 meters 13.02 meters 14.02 meters
Draft 3.60 meters 3.75 meters tbd 3.75 meters 3.75 meters
Displacement 1,692 tons 2,075 tons tbd 2,335 tons 2,365 tons
Main machinery 2 x 8910 kW 2 x 8910 kW tbd 2 x 8910 kW 2 x 9240 kW
Speed (cruising) 18 knots 18 knots tbd 18 knots 18 knots
Speed (maximum) 28 knots 28 knots tbd 28 knots 28 knots
Endurance 4,000 nm 4,000 nm tbd 4,000 nm 5,000 nm
Primary sensors Thales MW08 Thales SMART-S MK2 Thales SMART-S MK2 Thales SMART-S MK2 Thales SMART-S MK2
Complement 80 91 tbd 110 100 + 20
Helicopter deck only deck and hangar (9 ton) tbd deck and hangar (9 ton) deck and hangar (10 ton)

See also


  1. "RENK AG Press Release, September 2006, Diesel Propulsion Drives: When perfection arises from tradition". 
  2. "Thales to supply key systems for new corvettes Indonesian Navy worth 60m euro.". 
  3. "Imtech Naval Projects Reference List" (PDF). 
  4. "Vietnam Negotiate Buying four Sigma Corvettes from the Netherlands". Defense Update. 2011-10-23. Retrieved 2011-12-28. 
  5. "Damen Shipbuilders interested to join in philippine navy frigate requirements". Defense Update. 2013-10-15. Retrieved 2013-11-5. 
  6. "Indonesian Specifications of the Sigma Class coverttes". 
  7. "ANTARA News: Navy chief takes delivery of corvette made in Netherlands". 
  8. "Two SIGMA 9113 corvettes more for Indonesia" (PDF). Archived from the original on 2006-10-01. [dead link]
  9. "JMR: Indonesia evaluates C-802". 
  10. "JNR: Indonesia selects Damen for frigate contract". 
  11. Damen Schelde Naval Shipbuilding signs contract for SIGMA 10514
  13. "The Indonesian Navy Task Force of PKR Starts its Mission in the Netherlands". April 15, 2013. 
  14. "Two-Ship Programme Firms Up for Indonesian PKR Frigate". May 17, 2013. 
  15. "Dutch Firm Gets Green Light for Military Exports to Indonesia". June 5, 2013. 
  16. "Indonesia signs for Thales TACTICOS system". September 10, 2013. 
  17. Joris Janssen Lok (8 February 2008). "Morocco's Dutch Frigate Order is Confirmed". Aviation Week & Space Technology. 
  18. Frank van de Wiel (7 April 2008). "Thales awarded contract for Moroccan OPV". Thales Nederland. [dead link]
  19. 19.0 19.1 "The Netherlands: Second Multi-Mission Frigate Launches at Damen Shipyard for Moroccan Navy". Shipbuilding Tribune. 4 March 2011. Archived from the original on 2 October 2011. Retrieved 2 October 2011. 
  20. 20.0 20.1 20.2 "First Multi Mission Frigate for Royal Moroccan Navy Starts Sea Trials". Shipbuilding Tribune. 12 May 2011. Archived from the original on 2 October 2011. Retrieved 2 October 2011. 
  21. "Damen Schelde Naval Shipbuilding Delivers SIGMA Class Frigate to Royal Moroccan Navy". Shipbuilding Tribune. 12 September 2011. Archived from the original on 2 October 2011. Retrieved 2 October 2011. 
  22. nedbase ict - (2010-07-18). "News - Damen Schelde Naval Shipbuilding". Retrieved 2011-12-28. 
  24. nedbase ict - "News - Damen Schelde Naval Shipbuilding". Retrieved 2011-12-28. 
  28. "Vietnam Navy selects MBDA Exocet and VL Mica missiles for its Sigma 9814 Corvettes". November 4, 2013. 


External links

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