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J-class yacht
A "J-Class" yacht is a single masted racing sailboat built to the specifications of Nathanael Herreshoff's Universal Rule, The J-Class are considered the peak racers of the era when the Universal Rule determined eligibility in the Americas Cup.
==Universal Rule==
The J-Class is one of several classes deriving from the Universal Rule for racing boats. The rule was established in 1903 and rates double masted racers (classes A through H) and single masted racers (classes I through S). From 1914 to 1937 the rule was used to determine eligibility for the Americas Cup. In the late 1920s the trend was towards smaller boats and so agreement among American yacht clubs led to rule changes such that after 1937 the International Rule would be used for 12-metre class boats.〔(universalrule.com ''History of the Universal Rule of Measurement'' )〕
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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