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 Catalina/Capri 25/250 Sailor's Forums
 General Sailing Forum
 To "fair" my keel . . . but what does it mean?		  New Topic  Topic Locked
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perserd
Deckhand

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USA
1 Posts
Initially Posted - 10/06/2005 :  21:50:47  Show Profile
First, although I have only a Cat 22, this forum is FANTASTIC! It has already prepared me for the work I'm doing - removing my keel, sandblasting and expoxy encapsulating and putting in a bushing to solve my "clunk."

Second, I have read many threads on fairing - how to do it, etc. But my question is, "What is it?" What does it mean "to fair?" And how do I know that I've "faired" my keel properly? I think it has something to do with shaping it to a particular shape so that it flows through the water in a certain manner, but what shape should my keel be "faired" to?

I will be posting photos of my work as other posts' photos have been an IMMENSE help in my preparation - I want to pass on my experience to others as those before me have done.
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Leon Sisson
Master Marine Consultant

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USA
1893 Posts
Response Posted - 10/07/2005 :  00:06:57  Show Profile  Visit Leon Sisson's Homepage
perserd,<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">I think it has something to do with shaping it to a particular shape so that it flows through the water in a certain manner, but what shape should my keel be "faired" to?<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">That's pretty much it! The better keels were originally designed to have a foil, or elongated teardrop cross section. Yours is probably that way -- the C-25 swing keel is for sure. There is a math formula for defining that shape. When your keel's cross section conforms to that formula, it's fair. And what is that formula and where can I get some, you ask? Search the Web for "NACA_Generator.zip" (or something like that, the "NACA" part is what's important) and download it.

<center></center>

After you unzip it, fool around with "NACA_generator.EXE" and you'll get the general idea. When it asks you for a 4-digit NACA number, try numbers in the range of 0012 to 0014. Check back if you have further questions.

-- Leon Sisson
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 10/07/2005 :  11:59:14  Show Profile  Visit Frank Hopper's Homepage
Catalina 22s now come with a fiberglass encapsulated perfectly faired keel. I would look very hard at buying a new keel before I started grinding and filling a cast iron keel. If you live near a Catalina dealer they will send the keel on one of his boat deliveries and the delivery should be close to free.
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Champipple
Master Marine Consultant

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USA
6855 Posts
Response Posted - 10/07/2005 :  15:06:22  Show Profile  Visit Champipple's Homepage
Essentially you want to fill in th holes and sand it smooth. When you get into one design fleets, J-24, Capri 25 etc, they have a template that has exact measurements you must adhere to. But for your purposes, if your just cruising, sanding it down to the metal and applying some filler, then sanding that smooth, should do you just fine.

dw
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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.