Sigma-class design

	SIGMA 9113 corvette, KRI Diponegoro (365)
Class overview
Builders	Damen Schelde Naval Shipbuilding; PT PAL Indonesia; ASTIMAR 20; COTECMAR;
Operators	Indonesian Navy; Royal Moroccan Navy; Mexican Navy;
Subclasses	9113 (Indonesian corvette variant); 9813 (Moroccan heavy corvette variant); 10513 (Moroccan light frigate variant); 10514 (Indonesian frigate variant); 10514 LROPV (POLA) (Mexican LR OPV Variant);
Built	2005–present
In commission	2007–present
Planned	18
Building	0
Completed	10
Cancelled	4
Active	10
Laid up	0
General characteristics (Corvette 9113)
Type	Multi-purpose corvette / 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 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	Cruising speed at 18 kn (33 km/h; 21 mph): 3,600 nmi (6,700 km; 4,100 mi); Economy speed at 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 with 4 × 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 VIGILE 100; ECM: Racal Scorpion 2L; Decoy: Terma SKWS, DLT-12T 130mm decoy launchers, port, starboard;
Armament	1 × Oto Melara 76 mm gun (A position); 2 × 20 mm Denel GI-2 gun (B position); 2 × quad (8) Mistral TETRAL Anti-air missile, forward & aft; 4 × Exocet MM40 Block II anti-surface vessel missile; 2 × triple launchers for 3A 244S Mode II/EuroTorp MU 90 torpedoes;
Aviation facilities	Landing pad, optional hangar

The SIGMA class is a Dutch-built family of modular naval vessels, of either corvette or frigate size, designed by Damen Group.

SIGMA stands for Ship Integrated Geometrical Modularity Approach. 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. The ship's dimensions of length and beam lead to the individual SIGMA type names: the SIGMA 9113 is 91 m (298 ft 7 in) long with a beam of 13 m (42 ft 8 in), the SIGMA 10513 is 105 m (344 ft 6 in) in length again with a beam of 13 m (42 ft 8 in)

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

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