Design and description
The Oslo class was based on the American Dealey-class destroyer escorts with modifications for northern sea conditions, including more freeboard forward. Oslo was 93.9 metres (308 ft 1 in) long between perpendiculars and 96.6 metres (316 ft 11 in) long overall with a beam of 11.2 metres (36 ft 9 in) and a draught of 5.3 metres (17 ft 5 in). The ship had a standard displacement of 1,450 long tons (1,473 t) and was 1,745 long tons (1,773 t) at full load. [lower-alpha 1] The frigate was powered by one set of STAL-de Laval PN20 double reduction geared turbines driving one shaft powered by steam provided by two Babcock & Wilcox boilers, rated at 20,000 shaft horsepower (14,914 kW). The ship had a maximum speed of 25 knots (46 km/h; 29 mph) and a range of 4,500 nautical miles (8,300 km; 5,200 mi) at 15 knots (28 km/h; 17 mph). Oslo was initially armed with four 3-inch (76 mm)/50 calibre guns mounted in twin turrets. [lower-alpha 2]
After a refit in the late 1970s Oslo mounted the two twin 3-inch mounts, six Penguin surface-to-surface missiles, one Mk 29 octuple launcher for Sea Sparrow surface-to-air missiles, carrying 24 missiles in total, and six Mk 32 324 mm (13 in) torpedo tubes in two triple mounts. The ship received her Mk 91 radar director for the Sea Sparrow missiles, and was fitted with DRBU 22, TM 1226 and HSA M 22 radars and SQS-36 sonar. In the late 1980s, Oslo underwent another modernisation. This time the aft twin 3-inch mount was removed to make space for the Teme III rocket-launched depth charges and 40 mm/70 calibre gun and Terne III and TSM 2633 hull and variable depth sonar and replacing the SQS-36. The frigate had a complement of 150 officers and ratings.
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Norway
