Rattanakosindra-class gunboat

	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.

Class overview
HTMS Sukhothai
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)