Bay-class frigate

	HMS Veryan Bay in 1945
Class overview
Name	Bay class
Builders	Charles Hill & Sons; Henry Robb; Blyth Dry Dock; Smiths Dock; William Pickersgill; Harland & Wolff;
Operators	Royal Navy; Portuguese Navy; Finnish Navy;
Preceded by	Loch class
In commission	1945–1971
Completed	26
General characteristics
Type	Frigate
Displacement	1,600 long tons (1,626 t) standard; 2,530 long tons (2,571 t) full;
Length	286 ft (87 m) p/p; 307 ft 3 in (93.65 m) o/a;
Beam	38 ft 6 in (11.73 m)
Draught	12 ft 9 in (3.89 m)
Propulsion	2 Admiralty 3-drum boilers, 2 shafts, 4-cylinder vertical triple expansion reciprocating engines, 5,500 ihp (4,100 kW)
Speed	19.5 knots (36.1 km/h; 22.4 mph)
Range	724 tons oil fuel, 9,500 nmi (17,600 km; 10,900 mi) at 12 knots (22 km/h; 14 mph)
Complement	Frigates: 157; Despatch vessels: 160; Survey ships: 133;
Sensors and ; processing systems	Type 285 fire control radar; Type 291 air warning radar; Type 276 target indication radar; High Frequency Direction Finder (HF/DF); IFF transponder;
Armament	4 × QF 4-inch Mark XVI guns on 2 twin mounting HA/LA Mk.XIX; 4 × 40 mm Bofors A/A on 2 twin mounts Mk.V; 4 × 20 mm Oerlikon A/A on 2 twin mounts Mk.V; 1 × Hedgehog 24 barrel A/S projector; 2 rails and 4 throwers for 50 depth charges;

The Bay class was a class of 26 anti-aircraft (A/A) frigates built for the Royal Navy under the 1943 War Emergency Programme during World War II (one of which was cancelled and six completed as despatch vessels or survey ships). They were based on the hulls of incomplete Loch class anti-submarine (A/S) frigates.

In 1959 and 1961, four frigates of the class (Bigbury Bay, Burghead Bay, Morecambe Bay and Mounts Bay) were transferred to the Portuguese Navy. Between 1966 and 1968, based in Mozambique, these ships were part of the Portuguese naval deterrent force against the Royal Navy Beira Patrol which was trying to enforce sanctions against Rhodesia. In 1966 the Portuguese Navy also bought the survey vessel Dalrymple which served until 1983.

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