Sigma-class corvette

Sigma 9113-class corvette (KRI Diponegoro)
Class overview
Builders:	Schelde Naval Shipbuilding
Operators:	Indonesian Navy (TNI-AL)  Royal Moroccan Navy
Subclasses:	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)
Propulsion:	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
Speed:	Maximum: 28 knots (52 km/h; 32 mph) Cruising: 18 knots (33 km/h; 21 mph) Economy: 14 knots (26 km/h; 16 mph)
Range:	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
Armament:	Guns: 1 x Oto Melara 76 mm (A position) 2 × 20 mm Denel GI-2 (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 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.

Users

• 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

• Malaysia Damen Schelde participated in the competition to supply the Royal Malaysian Navy with six frigates under the Second Generation Patrol Vessel program. It lost to the French Gowind class. The other competitor was the MEKO A200.
• Egypt Damen Schelde was in competition for 4 Sigma corvettes (+ 2 options) for the Egyptian Navy. The French Gowind-class corvette won this bid. The other competitor was TKMS MEKO A200.^[4]
• Philippines Damen Schelde bought bidding documents but did not submit an offer.^[5]
• United Arab Emirates Damen had submitted an offer (likely the Sigma 9813 or Sigma 9814) for the Abu-Dhabi-class corvettes. It lost to a corvette based on the Italian Comandanti class.
• 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 to Muscat. In April 2012 it was announced that they lost to the Singaporean Al-Ofouq-class patrol vessel by ST Engineering. Damen had offered the Sigma 7513.

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

TNI-AL / Sigma 10514 design

Moroccan Navy / Sigma 9813 & 10513 design

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][38][39]	Sigma 10513[40]	Sigma 10514[41]
Ordered by	-	-	Indonesian Navy	Royal Moroccan Navy	Vietnam People's Navy (cancelled)	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.^[42]

See also

• Amazonas-class corvette  Brazil
• Braunschweig class corvette  Germany
• Descubierta-class corvette  Spain
• Floréal-class frigate  France
• Gepard Cheetah-class frigate  Vietnam
• HTMS Krabi  Thailand
• Independence-class littoral mission vessel  Singapore
• Milgem-class corvette  Turkey
• Minerva-class corvette  Italy
• Qahir-class corvette  Oman
• Sa'ar 5-class corvette  Israel
• Steregushchy-class corvette  Russia
• Thetis-class patrol frigate  Denmark
• Type 056 corvette  China
• Visby class corvette  Sweden
• Kora-class corvette  India
• Kamorta class corvette  India

References

External links

Wikimedia Commons has media related to Sigma class corvette.

• SIGMA Class Frigates (FMMM), Morocco
• SIGMA 10513 Tarik Ben Ziad Frigate - Royal Moroccan Navy
• SIGMA 9813 Frigates Sultan Moulay Ismail & Allal Ben Abdellah - Royal Moroccan Navy
• Sigma 10514 PKR Frigate - Indonesia Navy (TNI AL)
• Commonality and similarity in DAMEN SIGMA designs
• SIGMA corvettes
• SIGMA Frigate
• SMART-S Mk2 Medium to Long Range (S-Band) Solid State Surveillance Radar

Ship classes of the Royal Moroccan Navy Frigates FREMM Frigate Descubierta class Floréal class FMMM Corvettes FMMM Offshore patrol vessels OPV-70 OPV-64 Osprey 55 class Lazaga class Cormoran class PR-72P class Landing Vessels BATRAL LST