Loch-class frigate

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HMS Loch Alvie
Class overview
Name	Loch class
Operators	Royal Navy South African Navy Royal Canadian Navy  Royal New Zealand Navy  Royal Malaysian Navy
Preceded by	River class
Succeeded by	Bay class
Completed	28
Cancelled	54
General characteristics
Type	Frigate
Displacement	1,435 long tons (1,458 t)
Length	307 ft 9 in (93.8 m)
Beam	38 ft 9 in (11.8 m)
Draught	8 ft 9 in (2.7 m)
Installed power	2 Admiralty 3-drum boilers 5,500 ihp (4,100 kW) (steam engines) or 6,500 shp (4,800 kW) (steam turbines)
Propulsion	2 shafts 2 × vertical triple-expansion steam engines or 2 × Parsons steam turbines
Speed	20 knots (37 km/h; 23 mph)
Range	9,500 nmi (17,600 km; 10,900 mi) at 12 knots (22 km/h; 14 mph)
Complement	114
Sensors and processing systems	Types 144 and 147B ASDIC Type 277 surface-search radar
Armament	1 × single QF 4-inch Mark V 1 × quadruple QF 2-pounder 2 × twin Oerlikon 20 millimetres (0.79 in) AA guns or 2 × single Bofors AA guns 2–8 × single 20 mm Oerlikon AA guns 2 × Squid triple-barrelled anti-submarine mortars 1 rail and 2 throwers for 15 depth charges

The Loch class was a class of anti-submarine (A/S) frigate built for the Royal Navy and her Allies during World War II. They were an innovative design based on the experience of three years of fighting in the Battle of the Atlantic and attendant technological advances. Some shipyards had trouble building these larger ships, which led to widespread use of the Castle-class corvette, introduced around the same time.