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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > Measuring a foresail
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Thread: Measuring a foresail Reply to Thread

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Topic Review (Newest First)
07-10-2013 07:46 PM
Re: Measuring a foresail

Aha. Thanks Bob.
Sending you a pm.
07-10-2013 07:14 PM
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.
07-10-2013 07:03 PM
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).
07-10-2013 04:08 PM
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%

07-10-2013 02:37 PM
Measuring a foresail

How do you measure a genoa in terms of %?

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