a unit scheme, with two sets of boilers and turbines separated to reduce the potential for a single torpedo or shell hit to cause complete loss of power. It was noted though by the Director of Naval Construction in June 1945 that the boiler rooms were still too close to avoid the possibility of both being knocked out by a single hit. The ship was planned to have a range of at . Armament The main gun armament was to be twelve 6-inch (152 mm) guns in four triple turrets. Consideration was given at first to using the existing Mark 24 mountings planned for the Tiger-class ships, as these could be delivered relatively quickly. The Mark 24, which was an improved version of the pre-war turret, was considered old fashioned however. A new mounting was chosen accepting the delays in construction that would ensue. The new turret, the Mark 25, mounted three QF 6 inch Mark V guns, capable of firing at a rate of 10–12 rounds per minute per gun compared with 6-8 for the Mark 24, and elevating to 80 degrees, giving an anti-aircraft capability. A armour-piecing shell could be fired to a range of . The turrets were arranged conventionally on the ships' centreline, with two forward and two aft. Secondary armament consisted of six QF 4.5 inch (113 mm) Mark 6 dual purpose guns in twin turrets as used in the . These could fire a shell to a range of , with a maximum effective altitude for anti-aircraft fire of . The guns were semi-automatic and fitted with a power loader, giving a maximum rate of fire of 24 rounds per minute per barrel. When the gun entered service, the power rammer proved unreliable and hand loading reduced the rate of fire to about 10–12 rounds per minute per barrel. The close-in anti-aircraft armament consisted of 20 Bofors 40 mm guns in 10 "Buster" self-contained twin mounts and 28 Oerlikon 20 mm cannon in 14 twin mounts. This was arranged with 7 twin Bofors and 4 twin Oerlikons around the bridge, 3 twin Bofors and 8 twin Oerlikons around the aft superstructure and 2 twin Oerlikons at the stern of the ship. Four quadruple 21 inch (533 mm) torpedo tubes were fitted. Comprehensive fire-control equipment was proposed, with two Low-Angle (LA) directors for the 6-inch guns for use against surface targets, together with four barrage