Loch Class Frigates
Name Pennant Completed Fate
Loch Fada K390 Dec. 1943 Broken up 1970
Loch Killin K391 Nov. 1943 Broken up 1960
Loch Shin K421 Feb. 1944 To RNZN Sep. 1948 as Taupo, Broken up Dec. 1961
Loch Eck K422 Apr. 1944 Broken up Sep. 1965
Loch Fionn K423 Oct. 1944 Completed as Largo Bay
Loch Achanalt K424 Mar. 1944 To RNZN Sep. 1948 as Pukaki, Broken upJan. 1966
Loch Dunvegan K425 Mar. 1944 Broken up Aug. 1960
Loch Achray K426 July 1944 To RNZN Sep. 1948 as Kaniere, Broken up Feb. 1967
Loch Glass K427 Apr. 1945 Converted to Dalrymple, survey ship. To Portugal Mar. 1966 as Alfonso De Alverquerque
Loch Alvie K428 Apr. 1944 Broken up Nov. 1965
Loch Fyne K429 May. 1944 Broken up Aug. 1970
Loch Tarbert K431 Oct. 1944 Broken up Sep. 1959
Loch Insh K433 May. 1944 To Malaysia Oct. 1964 as Hang Tuah, Broken up 1977
Loch Quoich K434 Sep. 1944 Broken up Nov. 1957
Loch Bracadale K435 Oct. 1944 Completed as Enard Bay
Loch Carron K436 Mar. 1945 Completed as Gerrans Bay, later, Surprise
Loch Lomond K437 June 1944 Broken up Oct. 1968
Loch Assynt K438 Dec. 1944 Converted 1945 as Derby Haven, depot ship. To Iran 1949 as Babur, Broken up Oct. 1969
Loch Morlich K517 Jan. 1944 To RNZN Apr. 1949 as Tutira, Broken up Dec. 1961
Loch Achilty K600 Jan. 1945 Completed as St Brides Bay
Loch Arkaig K603 June 1945 Broken up Jan. 1960
Loch Arklet K604 Feb. 1945 Completed as Start Bay
Loch Arnish K605 Mar. 1945 Completed as Tremadoc Bay
Loch Carloway K606 Nov. 1944 Completed as Bigbury Bay
Loch Coulside K608 Aug. 1945 Completed as Padstow Bay
Loch Craggie K609 May. 1944 Broken up Oct. 63
Loch Eil K611 May. 1945 Converted 1947 as Dampier (survey ship), Broken up Jan. 1969
Loch Frisa K615 Oct. 1944 Completed as Widemouth Bay
Loch Garasdale K616 Apr. 1945 Completed as WigTown Bay
Loch Glendhu K619 Oct. 1944 Broken up Nov. 1957
Loch Gorm K620 June 1944 To RHN Sep. 1961 as Orion, Broken up 1966
Loch Harport K622 Mar. 1945 Completed as Burghead Bay
Loch Heilen K624 Nov. 1944 Completed as Morecambe Bay
Loch Katrine K625 Aug. 1944 To RNZN July 1949 as Ro Toiti, Broken up Feb. 1967
Loch Kilbernie K627 June 1945 Completed as Mounts Bay
Loch Killisport K628 July 1944 Broken up Mar. 1970
Loch Laxford K630 Dec. 1944 Completed as Cardigan Bay
Loch Lubnaig K633 Dec. 1944 Completed as Whitesand Bay
Loch Lyddoch K634 Nov. 1944 Completed as St Austell Bay
Loch Maddy K636 Mar. 1945 Completed as Carnarvon Bay
Loch Mochrom K638 Sep. 1945 Converted 1947 as Cook, survey ship, Broken up May. 1968
Loch More K639 Oct. 1944 Broken up Aug. 1963
Loch Muick K640 Oct. 1945 Converted 1947 as Owen, survey ship, Broken up July 1970
Loch Roan K644 Feb. 1945 Completed as Cawsand Bay
Loch Ruthven K645 June 1944 Broken up 1966
Loch Scamadale K646 July 1945 Completed as Dundrum Bay, later, Alert
Loch Scavaig K648 Sep. 1944 Broken up Sep. 1959
Loch Muick K650 June 1945 Completed as Porlock Bay
Loch Swannay K651 Nov. 1944 Completed as Veryan Bay
Loch Torridon K654 Jan. 1945 Converted as Woodbridge Haven, depot ship, converted 1955 for Mine Support, broken up 1965
Loch Tralaig K655 Feb. 1945 Broken up Aug. 1963
Loch Veyatie K658 Oct. 1945 Broken up Aug. 1965

The Loch class frigates were developments of the earlier Rivers, and were the ultimate escort frigates, drawing on experience from 3 years of U-boat hunting. They were built as prefabricated parts, with rounds replaced by squares and curves by straights to facilitate production, these sections welded or rivetted together depending on the builder's facilities. Like the other escorts, they followed mercantile building practices, to speed building.
The two major advances were the excellent SW type 277 RDF ad the squid, a 12" mortar capable of lobbing a depth charge for 1/2 a mile. Unlike squid, this exploded at a set depth and not on impact, so was far more effective. Such was the confidence on this weapon, depth charge stowage fell from 200 in the River class to one rack for 15 on a bare quarterdeck.
The main dvantage of the Squid ( and Hedgehog to a lesser degree ) was that on a final run in to depth charge a target, the asdic became inoperable - the ship was blind at the vital moment. Thus, a weapon with a 600 yard range could range-out whilst still in asdic contact, for an accurate attack. These were regarded as the main weapon, unlike the River class in which the gun was the main weapon, the DC's being there to bring up a submerged target. The two squids were hosed in a protective housing on the shelter deck, dry, safe and with a direct supply of reloads. The 4" gun was relegated to the forecastle in a characteristically tall HA mount. A multiple pom-pom replaced the 4" gun aft, and there was provision for two tin and up to eight single 20mm cannons, although only 2 tended to be carried, or two 40mm Bofors.
The heavier SW type 277 RDF required a lattice foremast, the set at it's head, and IFF 242/252/253 was carried to complete the setup. Two asdics were carried; depth finding and a range / search / attack type.
Two vessels carried turbines to investigate how suitable they were, but it was obviously impossible to fit a large number of the class with them.

Gross Displacement 2260 tons Length 307'
Net Displacement 1435 tons Beam 38.5'
Load 825 tons Draught 13.25'


Performance & Propulsion
Machinery 2 x Admirality 3 drum boilers;
2 x Triple Expansion reciprocating engines @ 5500 hp or;
2 x Parsons geared steam turbines in Tralaig & Arkaig @ 6500 shp
Speed 19 kts, 20.5 kts in turbine ships


Armament & Complement
Complement 114 Officers & Ratings
  • Gun
    • 1 x 1 x 4" AA
    • 1 x 4 x 2 pdr. pom-pom AA
    • 2 x 2 x 20mm Oerlikon AA
    • 8 x 1 x 20 mm Oerlikon AA, normally only 2, or;
    • 2 x 1 x 40mm Oerlikon AA
  • ASW
    • 2 x 3 x 12" Squid Mortars
    • 1 x DC Rails
    • 2 x DC Lobbers
    • 15 x DC's


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