Measuring a foresail - SailNet Community
Old 07-10-2013 Thread Starter
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Measuring a foresail

How do you measure a genoa in terms of %?
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Re: Measuring a foresail

IIRC, it's the % the foot measurement passes the mast. If yer tack to mast is 11 feet and yer sail foot is 16 feet, yer % would be foot/"j" (?); or 145%

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Re: Measuring a foresail

I always thought it was the percentage by which sail area exceeded the area of the foretriangle (top of the forestay to bottom of forestay to bottom of mast to top of forestay).

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Re: Measuring a foresail

No Mike:
The percentage is a percentage of your "J" measurement measured on the "LP" (luff perpendicular). Your "J" measurement is taken from the front side of you mast to the tack fitting at the stem.

So, "J" is 100%.
A 130% genny will have a luff perpendicular (LP) of 130% of "J"

You can measure your luff perpendicular by taking a line from your clew and run it straight to the luff so it makes a 90 degree angle (perpendicular) at the luff.

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Last edited by bobperry; 07-10-2013 at 07:21 PM.
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Re: Measuring a foresail

Aha. Thanks Bob.
Sending you a pm.

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