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Jib Search

I or HL = feet    "Headsail Max Luff" is measured from jib halyard sheave to the tack shackle or horn. For a furling system, measure from the sail attachment points when the system is fully raised. "I" is measured from the top of the jib halyard sheave to the deck (actually the sheer line). "J" is measured from the front side of the mast to the intersection of the deck and head stay.