Sigma-class corvette

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KRI Diponegoro on sea trials in the Netherlands in April 2007. Photo courtesy of Mr Wim Kosten,maritimephoto.com
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)
Propulsion:

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 with passive roll stabilization
Speed:

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

Economy: 14 knots (26 km/h)
Range:

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 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
Electronic warfare
& decoys:

ESM: Thales DR3000
ECM: Racal Scorpion 2L

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

Guns: 1 x Oto Melara 76 mm (A position)
2 x 20 mm Denel Vektor G12 (Licensed copy of GIAT M693/F2) (B position)
Anti-air missile: 2 x quad (8) MBDA Mistral TETRAL, forward & aft
Anti-surface missile: 4 x MBDA Exocet MM40 Block II

Torpedoes: 2 x triple B515 launchers for EuroTorp 3A 244S Mode II/MU 90
Aviation facilities: landing pad, optional hangar

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

Modular design[edit]

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.

Users[edit]

  • 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[edit]

  • 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.
  • 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.

Failed bids[edit]

  • Egypt Damen Schelde was in competition for 4 Sigma corvettes (+ 2 optional) for the Egyptian Navy. The French Gowind corvette won this bid. The other competitor was TKMS MEKO A200.
  • Philippines Damen Schelde bought bidding documents but did not submit a offer.

Indonesian variants[edit]

SIGMA 9113

The Indonesian variant is based on the Sigma 9113 design. 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.

Options for 2 other units were exercised on January 2006 with the first steel cut commenced on 3 April 2006 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 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 with PT PAL Indonesia and Damen Schelde to build a 105 meters frigate in Indonesia based on Damen Schelde Sigma 10514 design. The first hull only will be equiped with guns (without major weapons) and the second hull is complete with the 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. 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, 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

Moroccan variants[edit]

On February 6, 2008, 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 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, began sea trials on 6 May 2011 and was delivered on 12 September 2011. The second ship was launched on 2 February 2011, with sea trials planned for late in the year. The third ship was planned to be launched in September 2011.

Ships of class[edit]

TNI-AL / Sigma 9113 design