Rattanakosindra-class gunboat

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HTMS Sukhothai
Class overview
Name	Ratanakosindra class
Builders	Armstrong Whitworth, High Walker, Newcastle upon Tyne Vickers Armstrong, Barrow-in-Furness
Operators	Royal Thai Navy
Built	1924–1930
In service	1929–1971
Completed	2
General characteristics (as built)
Type	Gunboat
Displacement	866 t (852 long tons) (standard) 1,000 t (980 long tons) (full load)
Length	53.04 m (174 ft 0 in)
Beam	11.3 m (37 ft 1 in)
Draft	3.28 m (10 ft 9 in)
Installed power	2 Yarrow boilers 850 PS (630 kW; 840 shp)
Propulsion	2 shafts; Vertical Triple Expansion engines
Speed	12 knots (22 km/h; 14 mph)
Range	2,000 nmi (3,700 km; 2,300 mi) at 10 knots (19 km/h; 12 mph)
Crew	103
Armament	2 × single 152 mm (6.0 in) (Armstrong Pattern TT 6 inch/50 naval gun) 4 × single 76 mm (3.0 in) Armstrong Pattern N 3 inch/40 naval gun) AA guns
Armour	Belt: 1.25–2.5 in (32–64 mm) Decks: .75–1.5 in (19–38 mm) Barbettes: 2.5 in (64 mm) Gun turrets: 2.5 in (64 mm) Conning tower: 4.75 in (121 mm)

The Rattanakosindra class (Thai: เรือปืนชั้นรัตนโกสินทร์) were a pair of ocean-going armoured gunboats built in the United Kingdom and operated by the Royal Thai Navy.