![]() ![]() The hull was designed in 1947, the internal configuration in 1953 and construction of the Class began in 1954. ![]() The River Class Destroyer Escort (DE) were 112.8 meters in length, 12.5 meters across the beam, 2,750 tonnes displacement and carried a crew of 250. The ship can be controlled from this compartment, where a mass of dials and screens gives the Commanding Officer all available technical information." ![]() An elaborately equipped operations room is the hub of the frigate. From Navy News, dated May 15 1964, " Derwent also is prepared for atomic warfare and has a 'wetting-down' device to cope with nuclear fall-out. Both ships featured a flushed hull on the portside aft, to accommodate a control room and deck space for their variable depth sonar. A crew of six was carried in the turret for loading and operation, and a further 18 below for supply of shell and cordite from the magazines to the gun bay and up to the turret.ĭerwent, with her consort, Stuart, were the second pair of Type 12's to be ordered in 1958, but to a slightly modified design. The 4.5 inch twin turret was designed as dual purpose, having both anti-surface and anti-aircraft capabilities. The ships also introduced a number of new capabilities, including a hull-mounted medium range sonar, and in the case of Derwent and Stuart, a Type 199 variable depth sonar that could be lowered below the surface temperature layer. In the event only four hulls were finally approved, with an armament of one twin 4.5 inch turret, one twin 40 mm Bofors Mk 5, two Limbo anti-submarine mortars and twelve 21-inch torpedo tubes. The six new anti-submarine frigates were to be a modified version of the Royal Navy's Type '12' Rothesay Class frigates, but with improvements in habitability to meet specific Royal Australian Navy (RAN) needs. The decision to acquire a new generation of frigates was announced in August 1950. ` Swan (III) and her sister ship, TORRENS, were the final two River Class DEs constructed for the RAN. Swan (III) and Torrens (II) were a derivation of the Royal Navy's Leander Class general purpose frigate, which was itself a development of the Type '12'. The first four Type 12 River Class Destroyer Escort / Anti-Submarine frigates, Parramatta (III), YARRA, STUART and Derwent, were a modified version of the Royal Navy's Type '12' Whitby and Rothesay Class frigates, which had very good sea-keeping qualities. ![]()
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