Sigma-class design

There are three types of Sigma combatants

• Sigma frigate
• Sigma corvette
• Sigma fast attack corvette

Simplified comparisons between the different Sigma models.

Comparisons between the different Sigma models

	Compact Sigma 5910[4]	Compact Sigma 7310 [5]	Sigma 9113[6]	Sigma 9813[7]	Sigma 9814[8][9]	Sigma 10513[10]	Sigma PKR 10514[11]	Sigma 10514 LROPV
Ordered by	–	–	Indonesian Navy	Royal Moroccan Navy	Vietnam People's Navy (cancelled[12])	Royal Moroccan Navy	Indonesian Navy	Mexican Navy
Type	Fast attack corvette	Fast attack corvette	Corvette	Frigate	Frigate	Frigate	Frigate	Frigate (Long Range Patrol Vessel in the Mexican Navy)
Length	58.6 meters	74.2 meters	90.01 meters	97.91 meters	99.91 meters	105.11 meters	105.11 meters	107.5 meters
Beam	10.00 meters	10.00 meters	13.02 meters	13.02 meters	14.02 meters	13.02 meters	14.02 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	3.75 meters
Displacement	750 tons	900 tons	1,692 tons	2,075 tons	2,150 tons	2,335 tons	2,365 tons	2,575 tons
Main machinery	3 x –	4x 3900  kW	2 x 8910 kW	2 x 8910 kW		2 x 8910 kW	2 x 10.000kW	2 x 13410 kW
Speed (cruising)	18 knots	18 knots	18 knots	18 knots	tbd	18 knots	18 knots	18 knots
Speed (maximum)	32 knots	34 knots	28 knots	28 knots	tbd	28 knots	28 knots	28 knots
Endurance	2,000  nmi	2,000  nmi	3,600 nmi	4,000 nmi		4,000 nmi	5,000 nmi	5,000 nmi+
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	Thales SMART-S MK2
Complement	37	50	80	91	103	110	122	122
Helicopter capabilities	none	none	deck only	deck and hangar (9 ton)	deck and hangar	deck and hangar (9 ton)	deck and hangar (10 ton)	deck and hangar (10 ton)

There are multiple new Sigma designs released in early 2015 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.[13]

• Indonesia (TNI-AL) has four SIGMA 9113 Diponegoro-class corvettes in active service from 2009. In August 2010, Indonesia signed a deal to build Martadinata-class frigates based on the SIGMA 10514 in PT PAL Shipyard at Surabaya, Indonesia. A second contract was signed in February 2013. Eventually six ships will be built. The first ship, KRI Raden Eddy Martadinata (331), was commissioned on 7 April 2017 at Tanjung Priok.[14] The second ship, KRI I Gusti Ngurah Rai (332), was commissioned on 10 January 2018.[15]
• Morocco has ordered two 9813 class heavy corvettes (with VLS) and a light 10513 class frigate based on a modified design.

• Mexico has ordered 8 Sigma 10514 LROPV[16] based upon the Indonesian variant with different weapon systems and different role. The Mexican navy will use its Sigma frigate as a long range patrol vessel. The keel was laid on 17 August 2017, and was launched on 23 November 2018 and service to begin in 2020. The ship will be built in six modules, with two of these modules built by Damen Schelde Naval Shipbuilding in Vlissingen in the Netherlands, and the remaining four by the Mexican Navy shipyard in Salina Cruz under the supervision of Damen Schelde Naval Shipbuilding. The Sigma will replace the four Allende class (ex-USN Knox class), and two Bravo class (ex-USN Bronstein class) of frigates.

• Poland - Damen Schelde submitted[17] its SIGMA PL 10514 in two variants for the competition to supply the Polish Navy with options for their Miecznik & Czapla programmes. Miecznik will be a coastal defense ship and Czapla a patrol ship.
• Peru - The Peruvian Navy plans to acquire between three and six ships, with a displacement of 3,000 to 4,000 tons. During the 6th International Exhibition of Technology in Defense and Prevention of Natural Disasters (Sitdef 2017) Damen Group offered the Sigma-class design to the Peruvian Navy. It believes that the variety of models of frigates offered by the Sigma series allows to fit without difficulty to the requirements of the Peruvian Navy.[18]
• Colombia - The Colombian Navy wants to buy new ships, which will replace the Almirante Padilla class. Damen is one of the potential candidates to build the ships for the Colombian Navy.[19][20]

• 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 four Sigma corvettes (+ two options) for the Egyptian Navy. The French Gowind-class corvette won this bid. The other competitor was the TKMS MEKO A200.[21]
• Philippines Damen Schelde bought bidding documents but did not submit an offer.
• 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 being the potential sale of the ships to the Royal Navy of Oman. The official visit was cancelled due to the unrest in Oman at the time, although the queen 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.
• Romania is planning to purchase four corvettes in the upcoming seven years, which have to be built and equipped in a Romanian building yard.[22][23] Previously, in December 2016, the Romanian government decided that Damen Group would build four Sigma light frigates for a total of 1.6 billion euro at the Damen Galați Shipyard.[24] However, the new Romanian government is repealing this decision and will re-open the procurement again.[25] Nonetheless, Damen Group is a top contender for the job, since it has the only shipyard in Romania that has recent experience with building new naval ships reasonably fast and at a competitive price.[26]In July 2019, the Romanian authorities announced the selection of Naval Group and its partner Santierul Naval Constanta (SNC) for the programme to build four new Gowind multi-mission corvettes.

On 6 February 2008,[36] Morocco signed a USD$1.2 billion contract with Schelde Naval Shipbuilding for two light frigate SIGMA 9813 and one light frigate SIGMA 10513, which are modified versions of the existing Sigma-class design.

A subsequent contract was signed[37] 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,[38] began sea trials on 6 May 2011[39] and was delivered on 12 September 2011.[40] The second ship was launched on 2 February 2011,[38] with sea trials planned for late in the year.[39] The third ship was planned to be launched in September 2011.[39]

On 18 August 2017, Damen announced the keel laying for one SIGMA 10514 Long Range Ocean Patrol Vessel (SIGMA 10514 LROPV/ SIGMA 10514 POLA) at Damen Schelde Naval Shipyard in Vlissingen for the Mexican Navy. The vessel was constructed modularly in six modules, two modules were constructed in Vlissingen and the other four modules in Mexico. According to the Defense Security Cooperation Agency Major Arms Sale notification on 5 January 2018, the primary weapon systems for the Sigma class will include RGM-84L Harpoon Block II, RIM-162 ESSM[41] with eight cell MK56 VLS launcher, MK 54 Mod 0 lightweight torpedoes with two (2) MK 32 Surface Vessel Torpedo Tubes (SVTT) triple tube launchers, Block II Rolling Airframe Missile (RAM) missiles and Bofors 57 mm gun. [42] In April 2018 Damen Group contracted Spanish defense technology company Indra to equip the Mexican Navy's new long-range offshore patrol vessel (POLA) with its RIGEL electronic defense system.[43]

Indonesian Navy / Sigma 9113 design

Indonesian Navy / Sigma 10514 design

Moroccan Navy / Sigma 9813 & 10513 design

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

Mexican Navy / Sigma 10514 LRP design

• List of naval ship classes in service
• Martadinata-class frigate (an Indonesian frigate class based on the Sigma 10514 design)

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