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In page HMS Lord Clyde (1864):

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Lord Clyde was ship-rigged with three masts and had a sail area of 31,000 square feet (2,900 m2).[6] To reduce drag, the funnels were telescopic and could be lowered. Her best speed under sail alone was 10.5 knots (19.4 km/h; 12.1 mph), nearly the slowest of any British ironclad. The ship holds "the double record of being the largest ship of any type or of any nationality ever to enter Plymouth Sound or Spithead on sail alone".[7]