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Ton classes are categories used to identify classes of yachts. ==Thames Tonnage== Early attempts at creating rating rules were based on the British "old tonnage measurement" system to calculate the volume of the hold of large commercial ships. It gave the vessel's carrying capacity in tons (at 35 cubic feet per ton) or, as some believe, in tuns. Sail area was not included, of course, nor were any credits given for less efficient rigs so, naturally, in the yacht-racing field the cutters predominated. Eventually, this rule was modified in 1854 as the Thames Measurement Rule: where: *''length'' is the length, in feet, from the stempost to sternpost; *''beam'' is the maximum beam, in feet. 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Ton class」の詳細全文を読む スポンサード リンク
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