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Courageous-class battlecruiser
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=== Propulsion === To save weight and space the ''Courageous''-class ships were the first large warships in the Royal Navy to have geared [[steam turbine]]s and [[water-tube boiler|small-tube boilers]] despite the latter's significantly heavier maintenance requirements. Furthermore, to save design time, the turbine installation used in the light cruiser {{HMS|Champion|1915|2}}, the navy's first cruiser with geared turbines, was simply doubled. The [[Parsons Marine Steam Turbine Company|Parsons]] turbines were arranged in two engine rooms and each of the turbines drove one of the four propeller shafts. ''Furious''{{'}}s propellers were {{convert|11|ft|6|in|m|1}} in diameter. The turbines were powered by eighteen [[Yarrow Shipbuilders|Yarrow]] boilers equally divided among three boiler rooms. They were designed to produce a total of {{convert|90000|shp|lk=in|0}} at a working pressure of {{convert|235|psi|kPa kg/cm2|0|abbr=on|lk=on}}, but achieved slightly more than that during ''Glorious''{{'}}s trials, although she did not reach her designed speed of {{convert|32|knots}}.<ref>Roberts, pp. 71, 74, 76, 79.</ref> They were designed to normally carry {{convert|750|LT|t|0}} of [[fuel oil]], but could carry a maximum of {{convert|3160|LT|t|0}}. At full capacity, they could steam for an estimated {{convert|6000|nmi|-1}} at a speed of {{convert|20|knots}}.<ref name=b06>Burt, p. 306.</ref>
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