Loch-class frigate

General Characteristics
Displacement:	1,435 tons
Length:	286 ft p/p, 307.25 ft o/a
Beam:	38.5 feet
Draught:	8.75 ft standard, 13.25 ft full
Propulsion:	2 Admiralty 3-drum boilers, 2 shafts 4-cylinder vertical triple expansion reciprocating engines, 5,500 ihp, or; Parsons single reduction geared turbines, 6,500 shp
Speed:	20 kts (Alert and Surprise; 20.5 kts)
Range:	730 tons oil fuel, 9,500 nm at 12 kts
Complement:	114 (Depot ships; 120)
Armament:	1 x QF 4 inch Mark V on 1 single mounting HA Mk.III 4 x QF 2 pounder Mk.VII on 1 quad mount Mk.VII 4 x 20 mm Oerlikon A/A on 2 twin mounts Mk.V (or 2 x 40 mm Bofors A/A on 2 single mounts Mk.III) up to 8 x 20 mm Oerlikon A/A on single mounts Mk.III 2 x Squid triple barreled A/S mortars 1 rail and 2 throwers** for depth charges

Loch class frigates were essentially an improved River class. HMS Loch Arkaig (K426) and HMS Loch Tralaig (K655) were fitted with turbine engines that developed 1000 hp more power.