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Sydney Class Light Cruiser

a good view of Sydney in 1935
a good view of Sydney in 1935
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These 3 ships generally described as Modified Leanders, were ordered for the RN and transferred to the RAN.

Provided with twin funnels, through the adoption of the unit machinery principle. This copied the US idea of boiler rooms and engine rooms being alternated to form self-contained units. The additional spacing necessitated 2 funnels, and also allowed the aircraft to be fitted between them. The beam was increased by 20in to retain stability as a result of the armour belt surrounding the longer machinery space.

The end result was the most handsome cruisers ever built for the RN, with a symmetry that was attractive and functional.

Sydney and Perth were unaltered before their loss. Hobart had aircraft and catapult removed during the war and AA and radar considerably enhanced.

Displacement: 6,830 to 7,105 tons standard ; 9,000 to 9,275 tons full load
Dimensions: 522 pp, 555 oa x 56.75 x 16.25 feet
Propulsion: 4 shaft Parsons geared turbines, 4 Admiralty 3-drum boilers, 72,000 shp. = 32.5 knots
Range: 7,000 miles at 14 knots ; 1,800 tons fuel oil
Complement: 570
Armament: 4 dual 6-inch / 50 Mk 23 ; 4 dual 4-inch / 45 QF Mk 16 HA) ; 3 quad 0.5-inch MG ; 2 quad 21-inch TT. ; 1 seaplane
Armour: 1 to 3.5 inch magazine box protection ; 4 inch belt ; 1.25 inch deck ; 1 inch turrets ; 1.5 inch bulkheads