Bay class frigate

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General Characteristics
Displacement:	1,600 tons standard, 2,530 tons full
Length:	286 ft p/p, 307.25 ft o/a
Beam:	38.5 feet
Draught:	12.75 ft
Propulsion:	2 Admiralty 3-drum boilers, 2 shafts, 4-cylinder vertical triple expansion reciprocating engines, 5,500 ihp
Speed:	29.5 kts
Range:	724 tons oil fuel, 9,500 nm at 12 kts
Complement:	Frigates; 157 Yachts; 160 Survey ships; 133
Armament:	4 x QF 4 inch Mark XVI on 2 twin mounting HA/LA Mk.XIX 4 x 40 mm Bofors A/A on 2 twin mounts Mk.V 4 x 20 mm Oerlikon A/A on 2 twin mounts Mk.V 1 x Hedgehog 24 barrel A/S projector 2 rails and 4 throwers for 50 depth charges

The Bay class was a class of anti-aircraft (A/A) frigate built for the Royal Navy during World War II. They were based on the hulls of incomplete Loch class anti-submarine (A/S) frigates.

1 Design
2 Ships
3 See also
4 Bibliography

[edit] Design

The Bay class made use of the hull, machinery, lattice mast and superstructure of incomplete Loch class frigates. The armament was altered to suit them to the A/A role, with twin QF 4 in Mark XVI guns fore and aft in mounts HA/LA Mark XIX fitted with remote power control (RPC), controlled by a rangefinder-director Mark V carried on the bridge and fitted with radar Type 285 for range taking. Due to a shortage of supply of 4 inch guns and mountings, many ships had these removed from laid up V and W class destroyer "WAIR" conversions and Hunt class destroyers that were constructive total losses. A pair of Mark V "utility" mounts for twin 40 mm Bofors guns were sided amidships, each with its own predictive Simple Tachymetric Director (STD) for fire control. The A/A armament was completed by a pair of mounts Mark V for twin 20 mm Oerlikon guns, carried in the bridge wings. Later, the Oerlikons were replaced with single mounts Mark VII for Bofors guns, a further pair of which were added amidships on raised platforms. For A/S use, a Hedgehog projector was carried on the fo'c'sle and the quarterdeck carried two racks and four throwers for up to 50 depth charges.

In addition to the Radar Type 285 fire control set, Radar Type 291 air warning was carried at the head of the topmast in addition to Radar Type 276 (later 293) target indication at the masthead. The associated IFF transponders were also carried on the foremast to distinguish between friendly and enemy targets and a high frequency direction finder (HF/DF) was carried on a short pole mainmast aft.

Six Bays were completed to different designs. Alert and Surprise were completed as "despatch vessels", Commander-in-Chief's (C-in-C) yachts for the Mediterranean and Far East stations. These ships omitted the Mark V Bofors mounts and the aft 4 inch guns and had the superstructure extended to provide additional flag accommodation and stepped a tall mainmast. The four other ships completed as survey vessels, specifically to deal with the vast numbers of uncharted wrecks and mines around the British Isles from wartime. They were unarmed, except for four 3-pounder saluting guns. They had shorter forward shelter decks and carried survey boats under davits abreast the funnel and minesweeeping gear aft.

[edit] Ships

[edit] Frigates

HMS Bigbury Bay (K606) (ex- Loch Carloway)
HMS Burghead Bay (K622) (ex- Loch Harport)
HMS Cardigan Bay (K630) (ex- Loch Laxford)
HMS Carnarvon Bay (K630) (ex- Loch Maddy)
HMS Cawsand Bay (K644) (ex- Loch Roan)
HMS Enard Bay (K435) (ex- Loch Brachdale)
HMS Hollesley Bay (K614) (ex- Loch Fannich) - cancelled, 1945
HMS Largo Bay (K423) (ex- Loch Foin)
HMS Morecambe Bay (K624) (ex- Loch Heilen)
HMS Mounts Bay (K627) (ex- Loch Kilbernie)
HMS Padstow Bay (K608) (ex- Loch Coulside)
HMS Porlock Bay (K650) (ex- Loch Seaforth, ex- Loch Muick)
HMS St Austell Bay (K634) (ex- Loch Lyddoch)
HMS St Brides Bay (K600) (ex- Loch Achility)
HMS Start Bay (K604) (ex- Loch Arklet)
HMS Tremadoc Bay (K605) (ex- Loch Arnish)
HMS Veryan Bay (K651) (ex- Loch Swannay)
HMS Whitesand Bay (K633) (ex- Loch Lubnaig)
HMS Widemouth Bay (K615) (ex- Loch Frisa)
HMS Wigtown Bay (K616) (ex- Loch Garasdale)

[edit] Yachts

HMS Alert (K647) (ex- Dundrum Bay, ex- Loch Scamdale)
HMS Surprise (K346) (ex- Gerrans Bay, ex- Loch Carron)

[edit] Survey vessels

HMS Cook (K638) (ex- Pegwell Bay, ex- Loch Mochrum)
HMS Dalrymple (K427) (ex- Luce Bay, ex- Loch Glass)
HMS Dampier (K611) (ex- Herne Bay, ex- Loch Eil)
HMS Owen (K640) (ex- Thurso Bay, ex- Loch Muick)

[edit] See also

Loch class frigate - Frigate design forming the basis of the Bay class.

[edit] Bibliography

British and Empire Warships of the Second World War, H T Lenton, Greenhill Books, ISBN 1-85367-277-7
Royal Navy Frigates 1945-1983, Leo Marriot, Ian Allan, 1983, ISBN 0-7110-1322-5

Bay-class frigate