Emerald-class corvette

Turquoise at anchor
Class overview
NameEmerald class
Operators Royal Navy
Preceded byHMS Rover
Succeeded byBacchante class
Built1873–1878
Completed6
Scrapped6
General characteristics (as built)
TypeComposite screw corvette
Displacement2,120 long tons (2,150 t)
Tons burthen1,864 bm
Length220 ft (67.1 m) (p/p)
Beam40 ft (12.2 m)
Draught18 ft (5.5 m)
Installed power2,031–2,364 ihp (1,515–1,763 kW)
Propulsion
Sail planShip rig
Speed12–13 knots (22–24 km/h; 14–15 mph)
Range2,000–2,280 nmi (3,700–4,220 km; 2,300–2,620 mi) at 10 knots (19 km/h; 12 mph)
Complement230
Armament

The Emerald-class corvettes were a class of six composite screw corvettes built for the Royal Navy in the mid-1870s. The Opal was built by contract under the 1873-74 Programme, and Turquoise, Ruby, Tourmaline and Emerald under the 1874-75 Programme - the first three also by contract, while Emerald was dockyard-built at Pembroke. The final ship (Garnet) was also dockyard-built at Chatham under the 1875-76 Programme.