"Loch" Class, British Frigates

Photograph of a Loch-class frigate

Wikimedia Commons



1435 tons standard displacement


307'4" by 38'6" by 12'3"
93.68m by 11.3m by 3.73m

Maximum speed      

20 knots




1 4"/40 guns
4x1 2pdr AA guns
2x1 40mm Bofors AA guns
2x1 20mm Oerlikon AA guns
Squid (25 salvoes)
2 depth charge throwers (15 depth charges)
2-shaft reciprocating (5500 ihp)
Bunkerage 724 tons


4800 nautical miles (8890 km) at 15 knots
Type 128 sonar
Type 271 radar

The "Lochs" were completed in 1944-1945 as mass-production convoy escorts for the North Atlantic. A few units joined the Eastern Fleet just as Japan surrendered, and participated in the landing of occupation forces in southeast Asia.

The design was intended to produce a ship as capable as the "River" class frigates but more easily mass produced, and the design was known in its initial phases as the Twin Screw Corvette for Rapid Production. The design was fixed relatively early and prefabrication of hull sections was extensively employed. American prefabrication techniques were adopted and each prefabricated section was limited to 29' by 8'6" by 8'6" (8.84m by 2.59m by 2.59m) and 2.5 tons to permit transport by rail and assembly by light crane. The hull form itself was simplified, which aided production but had surprisingly little impact on performance. 

The main antisubmarine armament was the highly effective Squid mortar, and the conventional depth charge battery was kept quite small. Early production made do with Hedgehog and a heavier allotment of depth charges until enough Squids were available.

Units in the Pacific:

Loch Quoich
Arrived 1945-7

Loch Ruthven     
Arrived 1945-7-17

Loch Katrine     
Arrived 1945-7-27

Lock More
Arrived 1945-7-28

Loch Lomond     
Arrived 1945-6-28


Friedman(2006) (accessed 2014-1-9)

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