Whitby-class frigate

HMS Tenby, a Whitby-class frigate, in Amsterdam, 1969
Class overview
Name	Whitby class
Builders	Vickers Armstrongs, Barrow Cammell Laird, Birkenhead Harland & Wolff, Belfast
Operators	Royal Navy  Indian Navy  Royal New Zealand Navy
Preceded by	Type 11 (never built)
Succeeded by	Rothesay class
In commission	10 May 1956 (RN) – 31 August 1992 (IN)[1]
Completed	6 + 2 Indian
General characteristics
Type	Frigate
Displacement	2,150 tons (2,185 tonnes) 2,560 tons full load (2,600 tonnes)
Length	360 ft (110 m) w/l 370 ft (110 m) o/a
Beam	41 ft (12 m)
Draught	17 ft (5.2 m)
Propulsion	Y-100 plant; 2 Babcock & Wilcox boilers, 2 English Electric steam turbines, 2 shafts, 30,000 shp (22,000 kW)
Speed	30 kn (56 km/h)
Range	370 tons oil fuel, 4,200 nmi (7,780 km) at 12 knots (22 km/h)
Complement	152, later 225
Sensors and processing systems	Radar Type 293Q target indication, later; Radar Type 993 Radar Type 277Q height finding (later removed) Radar Type 275 fire control on director Mark 6M Radar Type 262 fire control on STAAG Radar Type 974 navigation Type 1010 Cossor Mark 10 IFF Sonar Type 174 search Sonar Type 162 target classification Sonar Type 170 attack
Armament	1 × twin 4.5 in (113 mm) gun Mark 6 1 × twin 40 mm Bofors gun Mark 2 STAAG, later; 1 × single 40 mm Bofors gun Mark 7 2 × Limbo anti-submarine mortar Mark 10 12 × 21-inch (533 mm) anti-submarine torpedo tubes (removed or never shipped)

The Type 12 or Whitby-class frigates were a six-ship class of anti-submarine frigates of the Royal Navy, which entered service late in the 1950s.^{[2][page needed][3][page needed]} They were designed in the early 1950s as first-rate ocean-going convoy escorts, in the light of experience gained during World War II. At this time, the Royal Navy were designing single-role escorts and the Whitbys were designed as fast convoy escorts capable of tackling high-speed submarines. However, this made the Whitbys more expensive and sophisticated to produce in large numbers in the event of a major war, and so the Type 14 "utility" or "second-rate" anti-submarine frigate was developed to complement the Type 12. Although themselves rapidly outdated, the Type 12 proved to be an excellent basis for a series of frigate designs used by the British and Commonwealth navies for the next 20 years.