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 Catalina/Capri 25/250 Sailor's Forums
 General Sailing Forum
 Asym spinnaker area calculator		  New Topic  Topic Locked
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weluvlife
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166 Posts
Initially Posted - 01/18/2006 :  22:50:35  Show Profile  Visit weluvlife's Homepage
Hi,

Recently a friend, impressed by how well my asym spinnaker was
pulling my c25, asked me what size it was. I had no idea. I asked my sail maker for some specs:

"The sail is a 165%. The outer dimensions are 31.09, 27.98 and 17.6 feet. "

I came up with 244 sq ft. I'm thinking that the standard sail area formula for jibs and mains does not apply to spinnakers because of the extra fullness that chutes offer??

244 sq ft seems very small for a spinnaker? The specs I've read on this site show 400 and some for a "cruising" chute?

Do I just have a small chute or are the above specs standard for an asymetrical chute on a c25?
Mark Eichman
Lake Don Pedro,CA
www.lakedonpedrosailingclub.org
'86 c25 TR, SK
Edited by - on

Champipple
Master Marine Consultant

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USA
6855 Posts
Response Posted - 01/19/2006 :  10:18:53  Show Profile  Visit Champipple's Homepage
You’re a bit small. A standard symmetrical spinnaker is 261 square feet and a Tall rig is almost 280. Normally, if racing, you can’t exceed the symmetrical area with an asym. Your well within those norms.

Most PHRF organizations will allow up to a 150 or 155% jib so your only getting a bit more sail area 2 or 3% (remember 155% is measured based on bow to mast being 100% there isn’t a direct correlation in this sense to sail area) I’ve heard of chutes

Is it too small? That’s a question for you. Are you happy with its performance, do you feel you can handle it okay? It seems like your getting compliments on the way it moves your boat.

To get to the area of a symmetrical, you can roughly go up to about 180%
Edited by - on
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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.