Complete planning
Yacht sail specification studio
Estimate the working geometry, then turn the numbers into a consistent brief for professional verification.
Worked example
Example: 38-foot short-handed cruiser
I 14.0 m, J 4.2 m, P 13.2 m, E 4.5 m and LP 5.04 m produces a 120% genoa, approximately 35.3 m² of headsail area and a 31.2 m² triangular mainsail before roach.

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