Sigma Class Corvette
Class overview
Builders:	Schelde Naval Shipbuilding
Operators:	Royal Moroccan Navy  Indonesian Navy
Subclasses:	9113, 9813, 10513
Planned:	3
Completed:	4
General characteristics
Type:	Corvette
Displacement:	1692 tons
Length:	90.71 meters (297.605 feet)
Beam:	13.02 meters (42.7165 feet)
Draft:	3.6 meters (11.8110 feet)
Propulsion:	2 x SEMT Pielstick 20PA6B STC rated at 8910 kW each driving a lightweight Geislinger[1] 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[2] with passive roll stabilization
Speed:	Maximum: 28 knots Cruising: 18 knots Economy: 14 knots
Range:	At cruising speed of 18 knots: 3600 Nm At economy speed of 14 knots: 4800 Nm
Complement:	20, up to 80
Sensors and processing systems:	Combat System: Thales Group TACTICOS[3] 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[4]
Electronic warfare and decoys:	ESM: Thales DR3000 ECM: Racal Scorpion 2L Decoy: TERMA SKWS, DLT-12T 130mm decoy launchers, port, starboard
Armament:	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 with ocean capabilities.

Contents 1 Modular design 2 Users 3 Indonesian variant 4 Moroccan variant 5 Ships of class 6 References 7 External links

[edit] 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.

[edit] Users

• Indonesia has four 9113 class corvettes in active service by 2009 .
• Morroco has ordered two 9813 class corvettes (with VLS) and a light 10513 class frigate based on a modified design.

[edit] Indonesian variant

The Indonesian variant is based on the Sigma 9113 design.^[5] 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. ^[6]

Options for 2 other units were exercised on January 2006 with the first steel cut commenced on 3 April 2006^[7] 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^[8] 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.

[edit] Moroccan variant

On February 6, 2008^[9], Morocco signed a USD$1.2 billion contract with Schelde Naval Shipbuilding for two SIGMA 9813 and one SIGMA 10145 which are modified versions of the existing SIGMA Class design.

SIGMA 10513

Dimensions: 105,11 x 13,02 x 3,75 meters Displacement: 2335 (t) Main machinery: 2 x diesel engines at 8910 kW max. power each 2 shafts with CPP Active roll stabilisation Speed: 26 knots Range: 4000 at 18 knots (nautical miles) Accommodation: 110

SIGMA 9813

Dimensions 97.91 x 13.02 x 3.75 meters Displacement: 2075 (t) Main machinery: 2 x diesel engines at 8910 kW max. power each 2 shafts with CPP Active roll stabilisation Speed: 26 knots Range: 4000 at 18 knots (nautical miles) Accommodation: 91

A subsequent contract was signed^[10] 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.

[edit] Ships of class

TNI-AL / Sigma 9113 design

Name	Pennant	Laid Down	Launched	Commissioned
KRI Diponegoro	365	24-Mar-2005	16-Sep-2006	5-Jul-2007
KRI Hasanuddin	366	24-Mar-2005	16-Sep-2006	24-Nov-2007
KRI Sultan Iskandar Muda	367	8-May-2006	24-Nov-2007	18-Oct-2008
KRI Frans Kaisiepo	368	8-May-2006	28-June-2008	7-Mar-2009

Moroccan Navy / Sigma 9813 & 10513 design

Name	Pennant	Laid Down	Launched	Commissioned
unknown	405	15-Apr-2009	Aug-2010	Aug-2011
unknown	406	Mar-2009	Mar-2011	Feb-2012
unknown	407	Sep-2009	Oct-2011	Aug-2012

[edit] References

[edit] External links

Wikimedia Commons has media related to: Sigma class corvette

• SIGMA Naval Patrol Series
• Damen Amels Yard, Vlissingen, Holland
• SEMT Pielstick 20PA6B STC fact sheet