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 damnable genoa anyway!		  New Topic  Topic Locked
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Sam Nelson
1st Mate

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USA
64 Posts
Initially Posted - 12/27/2001 :  21:48:43  Show Profile
Hi Folks!
A couple of questions about genoa sizing and rigging...
When I purchased my boat ('83 SK/SR) a furling genoa was installed, and I'm curious about how to tell what size it is. Whence exactly do the terms 110 or 150% genoa (for example) derive?
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eric.werkowitz
Captain

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USA
283 Posts
Response Posted - 12/27/2001 :  22:47:14  Show Profile
Sam,

Take a look at the Cat 25 manual on the association's webpages. They have a couple example headsails with dimensions. They show a Cat 25 tall rig 150 to have 244 sq ft while a 110 has 160. Obviously, the sail area ratios aren't the same as 150
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n/a
deleted

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163 Posts
Response Posted - 12/28/2001 :  08:01:56  Show Profile
I think the percentage refers to the percent of the foretriangle area, which is ~145 sq. ft. for a standard rig. Bill H. will know for sure.
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Champipple
Master Marine Consultant

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USA
6855 Posts
Response Posted - 12/28/2001 :  08:37:27  Show Profile  Visit Champipple's Homepage
In simple terms a 100% sail would cover the area of the foretriangle. The foot woul reach all the way back to the mast, no further. A 90% would reach 90% of the way to the mast. Therefore a 150 would be 1 1/2 times that amount.

Duane

Duane Wolff
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tinob
Master Marine Consultant

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USA
1883 Posts
Response Posted - 12/28/2001 :  08:55:48  Show Profile
Hi Sam,
There is a simple formula used to determine the % of a genny. It goes something like this--a perpendicular line coming off the luff intersects the clew and is devided by the length of the base (foot) of the fore triangle, said formula yields th
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Steve Milby
Past Commodore

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USA
5913 Posts
Response Posted - 12/28/2001 :  13:31:23  Show Profile
Hi, Sam!

Any headsail is more likely to snag when you tack in light air. The bigger the headsail, the more likely it is to snag, simply because big headsails reach farther back into the rigging. In strong winds, headsails are less likely to snag when y
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eric.werkowitz
Captain

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USA
283 Posts
Response Posted - 12/28/2001 :  15:17:28  Show Profile
Sam,

I forgot to suggest in my earlier post that you can add those little plastic wheels to the shrouds at the point where the knot from the sheets contacts them. I put them on my C25 and believe they reduced the tendency to hang up.

Eric Werkowitz
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John G-
Admiral

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793 Posts
Response Posted - 12/28/2001 :  16:53:10  Show Profile  Visit John G-'s Homepage
<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>
Also, when I tack and the genoa sweeps across the bow, how can I keep the lines from hanging in the standing rigging? It happens most every t
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Steve Kostanich
1st Mate

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88 Posts
Response Posted - 12/28/2001 :  23:20:59  Show Profile
I have always understood sail overlap percentages to be based on the "J" dimension of a given boat. The "LP" or length perpendicular is a product of the "J" times the desired overlap. The 'J' on a C-25 is 10.5' so a 150% genoa has an "LP" of 1.5 x 10.5
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Gary B.
Admiral

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USA
969 Posts
Response Posted - 12/29/2001 :  01:02:05  Show Profile
Steve: Yours is the formula described to me by Dale Waagmeester of Banks Sails in Portland, OR. The way he described it, the formula does not include the LP. I seem to remember, though, that one's PHRF formula is calculated on the maximum sail area of
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jwilliams
Captain

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USA
357 Posts
Response Posted - 12/29/2001 :  11:21:36  Show Profile
Sam,

There is a tech tip on how to make a simple roller for the forward shrouds. You use white pvc, 1/2 in., with end caps, about 8 ft long. You drill the end caps just large enough to fit over the threaded end.

I have a 150 furling genny and ex
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tinob
Master Marine Consultant

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USA
1883 Posts
Response Posted - 12/29/2001 :  11:23:46  Show Profile
Hello again Sam,
Formulas FOG me and so I overlooked your other concern. This season I went with the double bowlin that John mentioned and though I was careful to tape the loose ends as smoothly as possible they would snag when coming about if I didn'
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Derek Crawford
Master Marine Consultant

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USA
3324 Posts
Response Posted - 12/29/2001 :  13:56:57  Show Profile
Sam - I had much the same problem, and after much experimenting found that a small snap shackle attached to the genoa clew, with the genoa sheet attached to the shackle with a lark's head knot (I use one continuous sheet)works best. It avoids having any k
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Steve Kostanich
1st Mate

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88 Posts
Response Posted - 12/29/2001 :  19:04:44  Show Profile
Gary B.
I may be wrong here, but I do not believe that the length of the luff or foot have a thing to do with the with the rating, only the LP. Here is why; for any given sail, the luff is always assumed to be maximun for a given boat whatever the % of
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.