Halcyon-class minesweeper

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HMS Britomart secured to a buoy in Plymouth Sound
Class overview
Operators	Royal Navy
Preceded by	Racecourse class
Succeeded by	Bangor class
Subclasses	reciprocating / turbine-engined
Planned	22
Completed	21
Lost	9 (+1 constructive total loss)
Retired	12
General characteristics (reciprocating)
Type	fleet minesweeper
Displacement	815 tons (828 tonnes) standard 1,370 tons (1,391 tonnes) full load
Length	245 ft 9 in (74.90 m) o/aii
Beam	33 ft 6 in (10.21 m)
Draught	9 ft (2.7 m)[1]
Propulsion	2 × Admiralty 3-drum water-tube boilers, vertical compound reciprocating steam engines on 2 shafts, 1,770 ihp
Speed	16.5 to 17 kn (31 km/h)
Range	7,200 nmi (13,330 km) at 10 knots (19 km/h)
Complement	80
Armament	2 × QF 4 inch Mk.V (L/45 102 mm) guns 1 × mounting CP Mk.II 1 × mounting HA Mk.III 8 × .303 inch (7.7 mm) Lewis machine guns
General characteristics (Niger, Salamander)
Displacement	1,330 long tons (1,350 t)
Length	245 ft 3 in (74.75 m)
Propulsion	Vertical triple-expansion, 2,000 ihp
Speed	17 knots (31 km/h)
Armament	2 × QF 4 inch Mk.V (L/45 102 mm) guns, single mounts HA Mk.III 4 × .5 inch Mk.III (12.7 mm) Vickers machine guns, quad mount HA Mk.I 8 × .303 inch (7.7 mm) Lewis machine guns
Notes	Other characteristics as per reciprocating ships
General characteristics (turbine)
Displacement	815–835 long tons (828–848 t) / 1,290–1,350 long tons (1,310–1,370 t) full load
Propulsion	2 × Admiralty 3-drum water-tube boilers, Parsons steam turbines, 1,750 shp (1,305 kW) on 2 shafts
Speed	16.5 knots (31 km/h)
Notes	Other characteristics as per Niger/Salamander

The Halcyon class was a class of 21 oil-fuelled minesweepers (officially, "fleet minesweeping sloops") built for the British Royal Navy between 1933 and 1939. They were given traditional small ship names used historically by the Royal Navy and served during the Second World War.