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Gregrosine 07-10-2013 03:37 PM

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

deltaten 07-10-2013 05:08 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%


FSMike 07-10-2013 08:03 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).

bobperry 07-10-2013 08:14 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.

FSMike 07-10-2013 08:46 PM

Re: Measuring a foresail
Aha. Thanks Bob.
Sending you a pm.

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