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RMS Persia
''Persia'' was a British passenger liner operated by the Cunard Line that won the Blue Riband in 1856 for the fastest westbound transatlantic voyage. She was the first Atlantic record breaker constructed of iron and was the largest ship in the world at the time of her launch.〔 However, the inefficiencies of paddle wheel propulsion rendered ''Persia'' obsolete and she was taken out of service in 1868 after only twelve years. Attempts to convert ''Persia'' to sail were unsuccessful and the former pride of the British merchant marine was scrapped in 1872.
==Development and design==
As a result of competition from the Collins Line, Cunard ordered the ''Arabia'' in 1852 to retake the Atlantic records. ''Arabia'' crammed more powerful engines into a smaller ship than the Collins speedsters, and touched 15 knots on trials. However, she proved too powerful for her wooden construction and was unable to win the records. Cunard realized that in the future, new construction must include an iron hull.〔
For ''Persia'', Robert Napier and Sons of Glasgow designed an iron ship that was 16% larger than the wooden Collins liners and 50% larger than Cunard's ''Arabia''.〔 Her two-cylinder side-lever engine produced and consumed of coal per day. ''Persia's'' launch in July 1855 was a national event and she touched on her trials, although her normal service speed was limited to because of her high fuel consumption. She carried 250 first class and 50 second class passengers.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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