Rig geometry
Mainsail and headsail area calculator
Use this for early comparisons only. Finished sail area depends on real edge curves, roach, hollow, clew height and design shape.
Worked example
Example: preliminary inventory comparison
P 13.2 m and E 4.5 m gives 29.7 m² triangular mainsail area; a 5% allowance gives 31.2 m². I 14 m, J 4.2 m and LP 5.04 m gives about 35.3 m² headsail area.
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