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Portuguese Navy / Marinha Portuguesa Alvares Cabral / ex UK Bay class Frigate |
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| 03/24 | ||||
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Displacement: 1626 tons (standard) / 2570 tons (full) Length: 93.65 meters (307 feet 3 inches) Beam: 11.73 meters (38 ft 6 in) Draft: 3.89 meters (12 ft 9 in) Speed: 19.5 knots (36 km/h) Range: 9500 NM (17600 km) at 12 knots (22 km/h) Complement: 157 Propulsion: 2 x Admiralty 3-drum boilers 2 x vertical triple expansion (VTE) steam engines (4100 kW / 5500 hp) 2 shafts / 2 propellers Armament: 2 x QF 4-inch Mark XVI twin guns 2 x Bofors 40 mm twin AA guns 2 x Oerlikon 20 mm twin AA guns 1 x 24-barrel Hedgehog anti-submarine projector 4 x depth-charge projectors 2 x depth charge rails Aviation: none Systems: Type 285 fire control radar Type 291 air warning radar Type 276 target indication radar High Frequency Direction Finder (HFDF) IFF transponder |
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The Bay class was a class of 26 anti-aircraft (A/A) frigates built
for the Royal Navy under the 1943 War Emergency Programme during
World War II (one of which was cancelled and six completed as
despatch vessels or survey ships). They were based on the hulls of
incomplete Loch class anti-submarine (A/S) frigates. In 1959 and 1961, four frigates of the class (Bigbury Bay, Burghead Bay, Morecambe Bay and Mounts Bay) were transferred to the Portuguese Navy. Between 1966 and 1968, based in Mozambique, these ships were part of the Portuguese naval deterrent force against the Royal Navy Beira Patrol which was trying to enforce sanctions against Rhodesia. 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 Type 285 radar for range taking. Due to a shortage of supply of 4-inch (10 cm) 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 sited 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. source: wikipedia |
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| images | ||||
 K 622 HMS Burghead Bay > later F 336 NRP Alvares Cabral  K 606 HMS Bigbury Bay > later F 337 NRP Pacheco Pereira  K 606 HMS Bigbury Bay > later F 337 NRP Pacheco Pereira F 478 NRP Vasco da Gama  K 627 HMS Mounts Bay > later F 478 NRP Vasco da Gama  F 479 NRP Francisco de Almeida  K 624 HMS Morecambe Bay > later F 479 NRP Francisco de Almeida |
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