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 suspicious mark on the keel		  New Topic  Topic Locked
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cmckitrick
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USA
119 Posts
Initially Posted - 11/02/2004 :  12:34:17  Show Profile
Hi everyone. I was washing all the crud off my hull (fixed keel) and noticed a rusty looking crack like line on the keel and it is on both sides. I think it was there last season. This is the first year I've owned it. It was surveyed last year and no mention was made of it. My worst fear is some structural damage to the keel. Does anyone have any thoughts? I am wondering if I should have someone from a boat yard look at it or another surveyor. Thanks.
Charlie McKitrick
Norwell, MA
Valiant Lady... for now
'81 C 25 SR/FK
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tinob
Master Marine Consultant

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USA
1883 Posts
Response Posted - 11/02/2004 :  13:30:38  Show Profile
Sounds like the Catalina Smile. Caused at times by just loose keel bolts (easily cured) and at other times by softening of the board that the keel is mounted on (sometimes not so easily cured) or as you mentioned having the keel strike some unmovable object.

I'd check first to see if the keel bolts respond to the appropriate amount of tightening. Beyond that its anyones guess.

Val on the hard DAGNABIT
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 11/02/2004 :  21:16:04  Show Profile
Where on the keel? Val is talking about the keel-hull joint... Is it lower than that? Your keel bolts and nuts might be pretty rusty--they were mild steel with the cast iron keels. But the "smile" is pretty common, as is rust on the cast iron keels used into the early 80s. An alternative to cranking the nuts down might be to use an epoxy syringe to inject epoxy into the cracks, but I don't think we can tell from here. I'd have it looked at. The yard will probably check it for free (on the prospect of getting the work), while a surveyor might charge you a little for his trip, given that you aren't asking for a report.
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aeckhart
Master Marine Consultant

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USA
1709 Posts
Response Posted - 11/03/2004 :  09:19:15  Show Profile  Visit aeckhart's Homepage
If these are "jagged" cracks, perhaps it's the fairing compound beginning to fail. This happended on the surface of my 88 wing keel a few years ago. Chipping, sanding, and refairing cured the problem.

Al
GALLIVANT #5801
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cmckitrick
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USA
119 Posts
Response Posted - 11/03/2004 :  11:52:45  Show Profile
Thanks for the tips. The cracks are a little more than halfway down and they are irregular. I dont know where the bolts are or what the anatomy is like under the paint and gelcoat.
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ClamBeach
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3072 Posts
Response Posted - 11/03/2004 :  18:14:22  Show Profile
Rusty cracks showing halfway down the keel is probably due to the effect of rust working on the iron keel underneath the fairing compound.

Repair is to grind off the fairing, repair the rust on the iron keel and re-fair.

bb
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 11/03/2004 :  22:45:22  Show Profile
What did Catalina put on the cast iron fins? I have the glass-encased lead keel, so all I know about the iron ones is what I've noticed--lots of rusty "pocks" on many of them. But I don't know how they were coated/covered originally.
Edited by - Dave Bristle on 11/04/2004 09:08:40
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 11/04/2004 :  00:54:35  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by cmckitrick</i>
<br />Thanks for the tips. The cracks are a little more than halfway down and they are irregular. I don't know where the bolts are or what the anatomy is like under the paint and gelcoat.<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

If you have the Catalina "Smile", click on this link for [url="http://www.blumhorst.com/catalina27/images/keel_factory_drawings/keel_crack_repair._from_catalina.gif"]instructions on repairing this problem.[/url]
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cmckitrick
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USA
119 Posts
Response Posted - 11/05/2004 :  10:22:54  Show Profile
Thanks again. Where is that drawing from? I am having a hard time reading it. Also....really dumb question: What does fairing mean?
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tinob
Master Marine Consultant

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USA
1883 Posts
Response Posted - 11/05/2004 :  11:27:54  Show Profile
Charlie,

Fairing usually refers to attempts to control irregular surfaces by smoothing some form of BONDO like material over the irregularity allowing water to flow without drag or to minimize drag.

Val on the hard DAGNABIT
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 11/05/2004 :  12:56:18  Show Profile  Visit Frank Hopper's Homepage
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by cmckitrick</i>
<br />Thanks again. Where is that drawing from? I am having a hard time reading it. Also....really dumb question: What does fairing mean?
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

West makes excellent fairing compound that is perfect for your keel.
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 11/05/2004 :  20:32:30  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by cmckitrick</i>
<br />Thanks again. Where is that drawing from? I am having a hard time reading it. Also....really dumb question: What does fairing mean?<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

The drawing is from someone's C27 website. As for reading it, you should be able to expand it by clicking on the expansion arrow when it appears over the picture.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
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