Ratanakosin-class corvette

	HTMS Sukhothai
Class overview
Name	Ratanakosin class
Builders	Tacoma Boatbuilding Company
Operators	Royal Thai Navy
Succeeded by	Khamronsin class
Built	1984–1986
In commission	1986–present
Planned	3
Completed	2
Cancelled	1
Active	1
Lost	1
General characteristics
Type	Corvette
Displacement	840 t (830 long tons) (normal); 960 t (940 long tons) (full load);
Length	76.82 m (252 ft 0 in)
Beam	9.55 m (31 ft 4 in)
Draft	2.44 m (8 ft 0 in)
Installed power	12,000 kW (16,000 bhp)
Propulsion	2 × MTU 20V1163 TB83 diesel engines,; 2 × shafts;
Speed	26 knots (48 km/h; 30 mph)
Range	3,000 nmi (5,600 km; 3,500 mi) at 16 kn (30 km/h; 18 mph)
Complement	15 officers, 72 enlisted
Sensors and ; processing systems	1 × Decca 1226 surface-search radar; 1 × HSA ZW-06 surface-search radar; 1 × HSA DA-05 air/surface-search radar; 1 × HSA WM-25 fire-control radar; 1 × HSA LIROD-8 optical fire-control system; STN Atlas DSQS-21C hull-mounted sonar;
Armament	Missiles; 2 × quad RGM-84 Harpoon anti-ship missile launchers (8 Harpoons); 1 × octuple Albatros SAM launcher (24 Selenia Aspide SAMs); Guns; 1 × Otobreda 76 mm (3 in) gun; 2 × Bofors 40 mm (1 twin Otobreda mount); 2 × 20 mm Oerlikon GAM-B01 cannon; Torpedoes; 2 × Mark 32 triple torpedo tubes (Sting Ray torpedoes);

The Ratanakosin-class corvettes (Thai: รัตนโกสินทร์) are a class of two corvettes that were built for the Royal Thai Navy in the 1980s. Constructed by Tacoma Boatbuilding Company in the United States, a third was planned to be built in Thailand but was canceled before construction could begin. The Ratanakosin class is used as flagships for squadrons of fast attack craft.

One of the two, Sukhothai, sank in a storm on 18 December 2022.

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