One important non-Western (kind of) corvette choice is the SIGMA 10514 Frigate being ordered (and built) by Indonesia at PTPAL. The PLAN Type 056 used these as 'inspiration'. The original design is by DAMEN Schelde of the Netherlands. Although called Corvettes because of their size, these are armed at Frigate level. So one can call them mini Frigates.
SIGMA-class corvette construction
The keel for the first corvette in class, KRI Diponegoro (365), was laid down in March 2005. The vessel was launched in September 2006 and commissioned in July 2007.
The second corvette, KRI Hasanuddin (366), was also laid in March 2005 and launched in September 2006, but commissioned in 24 November 2007.
KRI Sultan Iskandar Muda (367), the third corvette, was laid in May 2006 and launched in November 2007. It was commissioned in October 2008.
Laid in May 2006, the fourth and last corvette, KRI Frans Kaisiepo (368), was launched in June 2008 and commissioned in March 2009.
Weapon systems fitted to the Indonesian corvettes
The SIGMA-class corvettes are equipped with MBDA Mistral Exocet surface-to-surface missiles (SSMs) and Tetral surface-to-air missiles (SAMs).
The Oto Melara 76mm super rapid gun fitted at forward can fire at a rate of 120 rounds a minute. Two 20mm G12 Denel Vector guns mounted aboard the vessel provide defence against aerial threats.
The corvettes are also equipped with two standard deck-mounted B515 trainable triple-barrel launchers, which are an upgraded version of the former ILAS-3 torpedo launcher.
Sensors / radars aboard the corvettes
Thales was awarded multiple contracts valued at approximately €60m for the delivery of above water and under water defence systems as well as communication systems for the first two corvettes, in 2004.
Kingklip medium frequency hull-mounted sonar gives the corvettes submarine detection capability. The LIROD Mk2 radar aboard the corvette serves as a fire control radar and optronic director, while MW08 3D multibeam radar operating in the G-band (C-band) provides surveillance and target designation.
The TACTICOS combat management system (CMS) from Thales serves as a command-and-control system which integrates onboard sensors.
"The corvettes are also equipped with two standard deck-mounted B515 trainable triple-barrel launchers."
Helicopter handling capabilities
The aft helicopter deck of the SIGMA-class can handle helicopters with a maximum weight of 5t. Provided with lashing points and refuelling system, the heli-deck enables day and night operations.
SIGMA-Class countermeasures
In addition to two Terma SKWS (soft kill weapon system) decoy launchers, the corvettes are fitted with Thales DR3000 ESM system and Racal Scorpion 2L ECM system that offer electronic countermeasures.
Propulsion and power
The SIGMA-class corvettes are powered by two SEMT Pielstick diesel engines driving two controllable pitch propellers via two shafts. Each engine delivers a maximum power output of 8,910kW, while the propulsion system provides a maximum speed of 28kt and a range of 3,000nm at 18kt speed. The corvettes also integrate passive roll stabilization system.
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
[1] 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 GroupTACTICOS
[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 and 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 GI-2 (Licensed copy of
GIAT M693/F2) (B position)
Anti-air missile: 2 x quad (8)
MBDAMistral 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