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Portuguese Navy / Marinha Portuguesa Almirante Pereira da Silva class Frigate |
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Builder: Lisnave - Estaleiros Navais de Lisboa, Portugal (472, 473) Estaleiros Navais de Viana do Castelo (ENVC), Portugal (474) Displacement: 1914 tons Length: 95.9 meters (314 feet 8 inches) Beam: 11.18 meters (36 ft 8 in) Draft: 5.33 meters (17 ft 6 in) Speed: 27 knots (50 km/h), max. Range: 3200 NM (5925 km) at 15 knots (28 km/h) Complement: 166 Propulsion: 2 x Foster-Wheeler boilers 1 x De Laval geared steam turbine (15000 kW / 20000 hp) 1 shaft / 1 propeller Armament: 2 x Mk.33 (76 mm/50 caliber - 3"/50) twin guns 2 x 4-tube 375 mm/14.75" anti-submarine rocket launchers 2 x 533 mm (21 inches) triple torpedo tubes 2 x depth-charge projectors Aviation: none Systems: MLA-1B air/surface search radar Mark 63 fire control system SPG-34 gun fire control radar / tracker Type 978 radar Decca RM316P navigation radar AN/SQS-30/31/32 sonar (472, 473, 474) AN/SQA-10 variable depth sonar DUBA-38 sonar |
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Three ships were ordered from Portuguese shipyards to a modified
design of the American Dealey class destroyer escorts. They were
funded in the United States as hulls DE-1039, DE-1042 and DE-1046
under the Mutual Defense Assistance Program. The vessels were
modified for service in tropical climates for service within the
Portuguese empire. Rated as frigates by the Portuguese Navy, they
measured 95.9 metres (314 ft 8 in) long overall with a beam of 11.18
m (36 ft 8 in) and a standard draught of 4.3 m (14 ft 1 in) and a
maximum draught of 5.33 m (17 ft 6 in). The frigates had a standard
displacement of 1,450 tonnes (1,430 long tons) and 1,914 t (1,884
long tons) at full load. They had a complement of 166 including 12
officers. The Admiral Pereira da Silva class ships were propelled by a propeller on a single shaft turned by a De Laval geared turbine creating 15,000 kilowatts (20,000 shp). It was powered by steam from two Foster-Wheeler boilers creating 2,100 kilopascals (300 psi) of pressure at 454 °C (850 °F). This gave the frigates a maximum speed of 27 knots (50 km/h; 31 mph). They carried 400 t (390 long tons; 440 short tons) of fuel oil giving them a range of 3,220 nautical miles (5,960 km; 3,710 mi) at 15 knots (28 km/h; 17 mph). The vessels were primarily designed for anti-submarine warfare (ASW). They were armed with two twin-mounted 3-inch (76 mm)/50-caliber dual-purpose guns, with one turret forward and one aft. In the "B" position forward, the frigates mounted two four-barrelled Bofors 375 mm (14.75 in) anti-submarine rocket launchers. The Admiral Pereira da Silvas also mounted two depth charge throwers and two triple 324 mm (12.75 in) Mk 32 ASW torpedo tubes for Mark 44 torpedoes. Admiral Pereira da Silva-class frigates were equipped with Mark 63 fire-control systems. They were also fitted with MLA-1B search, Type 978 tactical and SPG-34 fire control radars. Th three ships of the class were equipped with different sonar to reduce frequency interference. Admiral Pereira da Silva was given SQS-30, Admiral Gago Coutinho was given SQS-31 and Admiral Magalhães Correia was given SQS-31. All three vessels mounted SQA-10A variable depth sonar and DUBA-38 sonar. source: wikipedia |
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 F 472 NRP Almirante Pereira da Silva F 473 NRP Almirante Gago Coutinho  F 474 NRP Almirante Magalhaes Correia |
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