![]() ![]() " P" is the luff length of the mainsail, measured along the aft face of the mast from the top of the boom to the highest point that the mainsail can be hoisted or black band. "Square" Spinnaker Area = Max Luff x Max Girth) = 648 sq ft Spinnaker Area = Max Luff x Max Girth x ( 70-85%) = 453 to 550 sq ft They are rules of thumb, not measurements of a this specific boat.ġ55% Genoa = (( J x I ) / 2) x 1.65 = 299 sq ftġ35% Genoa = (( J x I ) / 2) x 1.44 = 261 sq ftĪ more accurate LP calculator is HERE Spinnaker But all things considered, these numbers are close but should not be considered exact. Also, remember that jib sail area in general is based on the forestay length, I. Sail areas depend on lots of factors, leach hollow, foot round, luff hollow etc. ![]()
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