Editing Renown-class battlecruiser (section)

===Propulsion===
The original plan for these ships was to use lightweight machinery producing a total of {{convert|110000|shp}}, but that would have required a considerable amount of time to complete its design. Rather than risk delaying the completion of the ships the machinery from HMS ''Tiger'' was duplicated with the addition of three extra boilers to provide the required power needed for the additional speed. Each ship had two paired sets of Brown-Curtis direct-drive [[steam turbine]]s, housed in separate engine-rooms. Each set comprised high-pressure ahead and astern turbines driving an outboard shaft and low-pressure ahead and astern turbines, housed in the same casing, driving an inner shaft.<ref>Raven and Roberts, p. 49.</ref> Their three-bladed [[propeller]]s were {{convert|13|ft|6|in|m}} in diameter.<ref>Roberts, p. 76.</ref> The turbines were powered by 42 [[Babcock & Wilcox]] [[water-tube boiler]]s in six boiler rooms at a working pressure of {{convert|235|psi|kPa kg/cm2|0|abbr=on|lk=on}}.<ref>Raven and Roberts, pp. 49–50.</ref> They were designed to produce a total of {{convert|112000|shp}}, but achieved more than {{convert|126000|shp|abbr=on|0}} during ''Renown''{{'}}s trials, when she reached a speed of {{convert|32.58|knots}}.<ref>Roberts, p. 81.</ref> They were the fastest capital ships in existence until the arrival of {{HMS|Hood|51|2}} in 1920.<ref>Burt 1986, p. 294.</ref>

They were designed to normally carry {{convert|1000|LT|t|0}} of [[fuel oil]], but had a maximum capacity of {{convert|4289|LT|t}}. At full capacity, the ''Renown''-class ships could steam at a speed of {{convert|18|knots}} for {{convert|4000|nmi|-1}}.<ref name=b97>Burt 1986, p. 297.</ref> The ships had two reciprocating steam-driven {{convert|200|kW|adj=on}} [[dynamo]]s, one oil-driven {{convert|150|kW|adj=on}} dynamo, and one turbine-driven {{convert|200|kW|adj=on}} dynamo that supplied the common [[ring main]] at 220 [[volt]]s.<ref>Raven and Roberts, p. 50.</ref>