Emerald-class cruiser

	Emerald
Class overview
Name	Emerald class
Builders	Armstrong Whitworth; John Brown;
Operators	Royal Navy
Preceded by	Danae class
Succeeded by	Leander class
In commission	1926–1948
Planned	3
Completed	2
Canceled	1
Retired	2
General characteristics
Type	Light cruiser
Displacement	7,580 long tons (7,700 t) (standard)
Length	570 ft (173.7 m)
Beam	54.5 ft (16.6 m)
Draught	16.5 ft (5.0 m)
Installed power	8 Yarrow boilers; 80,000 shp (60,000 kW)
Propulsion	4 shafts; geared steam turbines
Speed	33 kn (61 km/h; 38 mph)
Range	8,000 nmi (15,000 km; 9,200 mi) at 15 kn (28 km/h; 17 mph)
Complement	572
Armament	Emerald:; 7 × single 6 in (152 mm) guns; Enterprise:; 1 × twin, 5 × single 6 in (152 mm) guns; 3 × single 4 in (102 mm) AA guns; 2 × single 2 pdr (40 mm (1.6 in)) AA guns; 4 × quadruple 21 in (533 mm) torpedo tubes;
Armour	1.5–3 in (38–76 mm); Deck: 1 in (25 mm);
Aircraft carried	1 × aircraft (later removed)
Aviation facilities	1 × catapult (later removed)

The Emerald class or E class was a class of two light cruisers built for the Royal Navy. Following the Cavendish class, three ships of a new class were ordered in March 1918, towards the end of World War I, designed to emphasise high speed at the cost of other qualities, for use against rumoured new high-speed German cruisers – like the Brummer class – and particularly minelayers, in the North Sea. The third ship was cancelled in November 1918.