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Does anyone know what the LP of a 150% Genoa is on the MkV and the typical spinnaker measurements?
The LP (Longest Perpendicular) of a sail is equal to the "J" dimension of that boat expressed in percentage of the "J" dimension (J = the distance from the intersection of the forestay at the deck to the intersection of the front of the mast and the deck) on the Mark V the designed J is 10.08 ft., therefore a 155 LP is 10.08 x 150% = 15.12 ft. Spinnaker max girth is also a percentage of J, usually 180% or in the case of PHRF-LO 183%, so that would make the max girth of a Mark V on Lake Ontario 10.08 x 183% = 18.4464 (18.45) ft. it's measured by folding the Spinnaker in half verticaly and measuring to find the widest point and then multiplying that dimension by 2. The J dimension is also used to determine the length of the Spinnaker Pole 100% of J.
Steve
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