HTMS Makut Rajakumarn (Thai: เรือหลวงมกุฎราชกุมาร) is a frigate operated by the Royal Thai Navy. The ship was built by Yarrow Shipbuilders in Glasgow, Scotland 1971. The ship entered service in 1973 and is currently (2010) in service as a training ship.

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Makut Rajakumarn in 1983
History
Thailand
Name	HTMS Makut Rajakumarn
Namesake	Crown Prince of Thailand
Builder	Yarrow Shipbuilders, Glasgow
Launched	18 November 1971
Commissioned	7 May 1973
Status	in service as a training ship
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General characteristics
Type	Frigate
Displacement	1,650 tons standard, 1,900 tons full load
Length	97.6 m (320 ft 3 in)
Beam	10.97 m (36 ft 0 in)
Draught	5.5 m (18 ft 1 in)
Propulsion	2 shaft CODOG 1 Rolls-Royce Olympus gas turbine 19,500 hp (14,500 kW) 1 Crossley Pelstick PA6S diesel 6,000 hp (4,500 kW)
Speed	26 knots (48 km/h; 30 mph) 18 knots (33 km/h; 21 mph) diesels only
Range	5,000 nmi (9,300 km; 5,800 mi) at 16 knots (30 km/h; 18 mph)
Crew	140
Sensors and processing systems	Radar - HSA LW-04, HSA WM-22, Decca 626 Sonar 170B, 162, Plessey M27
Armament	Anti-aircraft missile (1x4) Sea Cat (later removed); 2 4.5 inch Mark 8 naval gun 2 × 40 mm Bofors AA guns (2x1) 1 Limbo anti submarine mortar (later removed) 2 × 3 anti-submarine torpedo tubes (added in 1988 replacing Limbo)

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The design was based on the Malaysian frigate KD Rahmat, but is larger and has a second gun at the stern. The ship was refitted in 1985–1988 following an engine room fire in 1984, with the Sea Cat missiles and Limbo anti submarine mortar removed and replaced by anti-submarine torpedo tubes and new radar and sonar.