HTMS Sukhothai (FS-442) (Thai: เรือหลวงสุโขทัย, RTGS: Sukhothai) was a corvette of the Ratanakosin class operated by the Royal Thai Navy

HTMSSukhothai(FS-442) (Thai: เรือหลวงสุโขทัย, RTGS: Sukhothai) was a corvette of the Ratanakosin class operated by the Royal Thai Navy. The ship was named after the Kingdom of Sukhothai, traditionally regarded as the first Thai kingdom along the Chao Phrahya river.<2>

On 18 December 2022, while on a weather patrol mission in the Gulf of Thailand, high winds and strong waves caused seawater to flow into the warship; this flooding caused a power outage and subsequent loss of control of machinery and steering mechanisms. Sukhothai continued to take on water until eventually sinking overnight. The Royal Thai Navy was dispatched to rescue the crew,<3> and as of 21 December 2022, they have confirmed that they have picked up 76 sailors, with 23 of the 105 crew members still missing and 6 sailors dead.

Sukhothai was a Ratanakosin-class corvette. Ordered for the Royal Thai Navy on 9 May 1983, the ship was laid down by Tacoma Boatbuilding Company in Tacoma, Washington, on 26 March 1984.<6><11> The Ratanakosin-class corvettes, of which there were two, were built to the following dimensions: 76.8 m (252 ft 0 in) in length, 9.6 m (31 ft 6 in) wide, with a displacement of 960 tons at full load. The class shares characteristics with the Royal Saudi Navy Badr-class corvette. The ship was powered by two diesel engines running two propeller shafts, providing a maximum speed of 26 knots (48 km/h; 30 mph) and a range of 3,000 nautical miles (5,600 km; 3,500 mi) at 16 knots (30 km/h; 18 mph). The crew complement was 87, of which 15 were officers, plus an expected contingent of flag officer's staff. Sukhothai was launched on 20 July 1986.<11> The ship was the last major vessel to be completed at Tacoma Boatbuilding's Yard 1 on the Hylebos Waterway.<12>

She was named after the Kingdom of Sukhothai, which is traditionally regarded as the first Thai kingdom.<2> The intended role of the Ratanakosin-class vessels was to provide surface-to-surface and surface-to-air missile capability on a highly maneuverable platform.<13> The vessels served as flagships for the Royal Thai Navy's squadrons of fast attack craft

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Sukhothai was a Ratanakosin-class corvette. Ordered for the Royal Thai Navy on 9 May 1983, the ship was laid down by Tacoma Boatbuilding Company in Tacoma, Washington, on 26 March 1984.<6><11> The Ratanakosin-class corvettes, of which there were two, were built to the following dimensions: 76.8 m (252 ft 0 in) in length, 9.6 m (31 ft 6 in) wide, with a displacement of 960 tons at full load. The class shares characteristics with the Royal Saudi Navy Badr-class corvette. The ship was powered by two diesel engines running two propeller shafts, providing a maximum speed of 26 knots (48 km/h; 30 mph) and a range of 3,000 nautical miles (5,600 km; 3,500 mi) at 16 knots (30 km/h; 18 mph). The crew complement was 87, of which 15 were officers, plus an expected contingent of flag officer's staff. Sukhothai was launched on 20 July 1986.<11> The ship was the last major vessel to be completed at Tacoma Boatbuilding's Yard 1 on the Hylebos Waterway.<12>

She was named after the Kingdom of Sukhothai, which is traditionally regarded as the first Thai kingdom.<2> The intended role of the Ratanakosin-class vessels was to provide surface-to-surface and surface-to-air missile capability on a highly maneuverable platform.<13> The vessels served as flagships for the Royal Thai Navy's squadrons of fast attack craft.