Cossack-class corvette

HMS Cossack, 1860s
Class overview
Name	Cossack class
Builders	W. & H. Pitcher, Northfleet
Operators	Royal Navy
Preceded by	HMS Pylades
Succeeded by	Pearl class
Planned	2
Completed	2
Retired	2
General characteristics
Type	Corvette
Displacement	1,965 tons
Tons burthen	1,32260⁄94 tons bm
Length	195 ft (59 m) (gundeck) 172 ft 1.4 in (52.461 m) (keel)
Beam	38 ft 6 in (11.73 m)
Height	22 ft 4 in (6.81 m)
Draught	17 ft 7 in (5.36 m) (forward) 17 ft 8 in (5.38 m) (aft)
Installed power	250 nominal horsepower
Propulsion	2-cylinder horizontal single expansion steam engine Single screw
Crew	270
Armament	18 × 68-pounder (60cwt) MLSB guns 2 × 68-pounder (95cwt) guns

The Cossack-class corvettes were two 20-gun first-class corvettes, initially under construction in Britain for the Imperial Russian Navy. These ships were seized on 5 April 1854, after the outbreak of the Crimean War.