Sigma-class corvette

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KRI Diponegoro on sea trials in the Netherlands in April 2007. Photo courtesy of Mr Wim Kosten,
Sigma 9113-class corvette (KRI Diponegoro)
Class overview
Builders: Schelde Naval Shipbuilding
  • 9113 (Indonesian corvette variant)
  • 9813 (Moroccan heavy corvette variant)
  • 10513 (Moroccan light frigate variant)
  • 10514 (Indonesian frigate variant)
Built: 2005-present
In commission: 2007-present
Building: 2
Planned: 11
Completed: 7
Active: 7
Laid up: 2
General characteristics
Type: Corvette or frigate
Displacement: 1,692 tons
Length: 90.71 m (297 ft 7 in)
Beam: 13.02 m (42 ft 9 in)
Draft: 3.60 m (11 ft 10 in)
  • 2 × 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 × Caterpillar 3406C TA generator rated at 350 kW each
  • 1 × Caterpillar 3304B emergency generator rated at 105 kW
  • 2 × shaft with Rolls Royce Kamewa 5 bladed CP propeller
  • 2 × Renk ASL94 single step reduction gear[1] with passive roll stabilization
  • Maximum: 28 knots (52 km/h; 32 mph)
  • Cruising: 18 knots (33 km/h; 21 mph)
  • Economy: 14 knots (26 km/h; 16 mph)
  • At cruising speed of 18 kn (33 km/h; 21 mph): 3,600 nmi (6,700 km; 4,100 mi)
  • At economy speed of 14 kn (26 km/h; 16 mph): 4,800 nmi (8,900 km; 5,500 mi)
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
Aviation facilities: landing pad, optional hangar

The Sigma-class corvette is a Dutch-built family of modular naval vessels, of corvette to frigate size with a blue water capability.

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 metres (298 ft 7 in) long and with a beam of 13 metres (42 ft 8 in). Likewise, the SIGMA 10513, is 105 metres (344 ft 6 in) in length with a beam of 13 meters.

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


  • Indonesia (TNI-AL) 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.

Under construction

  • Indonesia has ordered 2 Sigma 10514 class, these ships will be build by the Indonesian shipyard PT PAL with the first ship KRI 331 RE Martadinata was laid down in January 2014 and as of January 2016 the first ship is almost complete. On 18 January 2016 the ship was launched and is scheduled to be delivered to the Indonesian Navy in January 2017. The second ship, KRI 332 I Gusti Ngurah Rai, is under construction by PT PAL and the modules for the ship arrived in Surabaya in January 2016.

Failed bids

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 16 September 2006 and commissioned on 2 July 2007 by Admiral Slamet Soebijanto, Indonesian Navy Chief of Staff.[7]

Options for 2 other units were exercised in 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.

On 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-meter frigate in Indonesia based on Damen Schelde Sigma 10514 design. For the first ship, 5 modules for the ship will be build in Indonesia and the Dutch manufacturer Damen Schelde will build 2 modules while for the second ship the Indonesians will build 6 modules and Damen Schelde will build 1 module. The first hull will only be equipped with guns (without major weapons) and the second hull is complete with major weapons such as 76mm Main Canon, 12 MICA vertical launch air defence missile, MM-40 Exocet block II, Torpedo, and SMART-S MK2 radar system.[12] Though the Indonesian Navy announced that it will build two 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,[13] 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 1 February 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. As of December 2015, the first ship, KRI RE Martadinata (331), was 85% complete and the ship was launched on 18 January 2016.[14][15][16][17][18][19][20][21]

Moroccan variants

On 6 February 2008,[22] 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[23] on 1 April 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,[24] began sea trials on 6 May 2011[25] and was delivered on 12 September 2011.[26] The second ship was launched on 2 February 2011,[24] with sea trials planned for late in the year.[25] The third ship was planned to be launched in September 2011.[25]

Ships of class

TNI-AL / Sigma 9113 design

Name Pennant Laid down Launched Commissioned Notes
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 Notes
KRI RE Martadinata 331 January 2014 18 January 2016 Planned for 2017 Raden Edi Martadinata, a National Hero From Bandung and One of the founders Of Indonesian Navy
KRI IG Ngurah Rai 332 tba tba Planned for 2017 I Gusti Ngurah Rai , a National Hero From Bali Island and Leader on Puputan War against Dutch Colonialist

Moroccan Navy / Sigma 9813 & 10513 design

Name Pennant Laid down Launched Commissioned
Tarik Ben Ziyad 613 15 Apr 2009 12 July 2010[27] 10 Sep 2011[28]
Sultan Moulay Ismail 614 Mar 2009 4 Feb 2011[29] 10 Mar 2012[30]
Allal Ben Abdellah 615 Sep 2009 Oct 2011 8 Sep 2012[31]

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

Sigma versions

There are three types of Sigma combatants

  • Sigma frigate
  • Sigma corvette
  • Sigma fast attack corvette

Simplified comparisons between the different Sigma models.

Specifications Compact Sigma 5910[32] Compact Sigma 7310 [33] Sigma 9113[34] Sigma 9813[35] Sigma 9814[36][37] Sigma 10513[38] Sigma 10514[39]
Ordered by - -  Indonesian Navy  Royal Moroccan Navy  Vietnam People's Navy (cancelled[citation needed])  Royal Moroccan Navy  Indonesian Navy
Type Fast Attack Corvette Fast Attack Corvette Corvette Frigate Frigate Frigate Frigate
Build - - 4 2 0 1 0 (2 on order)
Length 58.6 meters 74.2 meters 90.01 meters 97.91 meters 99.91 meters 105.11 meters 105.11 meters
Beam 10.00 meters 10.00 meters 13.02 meters 13.02 meters 14.02 meters 13.02 meters 14.02 meters
Draft 3.10 meters 3.10 meters 3.60 meters 3.75 meters 3.75 meters 3.75 meters 3.75 meters
Displacement 750 tons 900 tons 1,692 tons 2,075 tons 2,150 tons 2,335 tons 2,365 tons
Main machinery 3 x - 4x 3900  kW 2 x 8910 kW 2 x 8910 kW tbd 2 x 8910 kW 2 x 9240 kW
Speed (cruising) 18 knots 18 knots 18 knots 18 knots tbd 18 knots 18 knots
Speed (maximum) 32 knots 34 knots 28 knots 28 knots tbd 28 knots 28 knots
Endurance 2,000  nm 2,000  nm 4,000 nm 4,000 nm tbd 4,000 nm 5,000 nm
Primary sensors Thales Smart-S MK2 Thales NS-100 Thales MW08 Thales SMART-S MK2 Thales SMART-S MK2 Thales SMART-S MK2 Thales SMART-S MK2
Complement 37 50 80 91 103 110 122
Helicopter none none deck only deck and hangar (9 ton) deck and hangar deck and hangar (9 ton) deck and hangar (10 ton)
Status - - In Service In Service Under construction In Service Under Construction

There are multiple new Sigma designs released in early 2015 of which little is known, these are the:

Sigma 8313 / Sigma 8011 / Sigma 7613 / Sigma 6610

They are likely to be part of the Compact SIGMA series, a new series small sized combatants with shorter range and up to 2 weeks mission endurance with the same combat systems as the larger Sigmas.[40]

See also


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External links