 Sydney I
Launched: 29 August 1912
Type: Chatham Class Light Cruiser
Commissioned: 26 June 1913
Decomissioned: 8 May 1928
Displacement: 5,400 tonnes
Length: 456 feet 10 inches
Beam: 49 feet 10 inches
Armament: 8 x 6-inch guns, 1 x 13-pounder gun, 4 x 3-pounder guns, 2 x 21-inch torpedo tubes
Main Machinery: 4 shaft Parsons Turbines (South Hampton 2 shaft brown Curtis Turbines - 25000bhp)
Speed:26 knots
Ship's Company: 376
 Sydney II
Launched: 22 September 1934
Type: Modified Leander Class Light Cruiser
Commissioned: 24 September 1935
Displacement: 6,830 tonnes
Length: 562 feet 3 inches
Beam: 56 feet 8 inches
Armament: 8 x 6-inch guns, 4 x 4-inch guns, 3 x 5mm machine guns, 12 Lewis Guns, 8 x 21 inch torpedo tubes (in 2 quadruple mounts)
Main Machinery: 4 shaft Parsons geared turbines (72000bhp)
Speed: 32.5 knots
Ship's Company: 645
Aircraft: 2 x Seagull Mk V (Super Marine Walrus)
 Sydney III
Launched: 30 September 1944
Type: Majestic Class Aircraft Carrier / Fast Troop Transport
Commissioned: 16 December 1948
Decomissioned: 12 November 1973
Displacement: 15,740 tonnes (as Aircraft Carrier), 12,569 tonnes (as Fast Troop Transport)
Length: 695 feet (overall)
Flight Deck: 690 feet 8 inches
Beam: 80 feet
Armament: 25 x 40mm Bofors guns (as Aircraft Carrier)
Main Machinery: Brown Curtis Turbines, 4 boilers, 2 shafts (42000bhp)
Speed: 25 knots
Ship's Company: 1335 (as Aircraft Carrier), 607 (as Fast Troop Transport)
Aircraft: Hawker Seafury & Fairey Firefly
(No aviation facilities as Fast Troop Transport)
Sydney IV
Launched: 26 September 1980
Type: Guided Missile Frigate
Commissioned: 29 January 1983
Displacement: 4200 tonnes
Length: 138.1 metres
Beam: 13.7 metres
Armament: 76mm rapid fire gun, Harpoon anti-ship missiles, Standard surface to air missiles, Evolved Sea Sparrow anti-air missiles, Mk 92 Fire Control System, Vulcan Phalanx close in weapons system, Mk 46 and MU 90 Torpedos, Nulka, Pirate and Seagnat anti-missile decoys
Main Machinery: Two General Electric LM2500 gas turbines driving a single controllable pitch propeller
Speed: 30+ knots
Ship's Company: Approximately 210
Aircraft: Up to two SeaHawk helicopters
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