The 12 Me­tre Rule

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This for­mula in­puts speed pro­duc­ing fac­tors (length (L), sail area (Sa), free­board (F), and a girth mea­sure­ment (2D)) through a sim­ple math­e­mat­i­cal for­mula. In or­der for a yacht to be a Twelve Me­tre the re­sults of this for­mula must not ex­ceed 12 Me­tres. To limit the like­li­hood that one 12 Me­tre de­sign would be vastly su­pe­rior to an­other and pro­mote fair and com­pet­i­tive rac­ing there are other re­stric­tions on de­sign mea­sure­ments of 12 Me­tre rac­ing yachts. Max­i­mum and min­i­mum pa­ram­e­ters on mast height, draft, beam and head­sail height are ap­plied to 12 Me­tre rac­ing yachts to en­sure that there is not too much di­ver­sity among boats.

A 12 Me­tre un­der con­struc­tion at the Lud­ers Marine Con­struc­tion Com­pany in Stam­ford, Con­necti­cut, in 1958.

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