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 Catalina/Capri 25/250 Sailor's Forums
 Catalina 25 Specific Forum
 Knotmeter impeller hole ...		  New Topic  Topic Locked
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Buzz Maring
Master Marine Consultant

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USA
1774 Posts
Initially Posted - 09/12/2002 :  11:23:49  Show Profile
Hi everyone,

I've asked this question before on other threads, and I never got a response ... so, here's a new thread in search of the answer.

My knotmeter is kaput. I want to plug the hole in the bottom of the boat where the impeller gizmo is mounted. I thought I could just buy a PVC pipe cap to screw over the end, but I can't find anything to match the size in the boat ... 'seems to be some oddball size or something.

If all else fails, I can just reinstall the impeller and make sure the gasket is OK, but I'd rather cap the hole. I've looked in the Catalina Direct catalog, and I can't find anything there that would work. 'Any suggestions?

Thanks!

Buzz Maring, C-25 SK/SR #68, "Freya"
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luckystar
Navigator

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USA
236 Posts
Response Posted - 09/12/2002 :  13:38:24  Show Profile  Visit luckystar's Homepage
Are you planning to replace at some point? Same brand? Will you need the thu-hull hole again? if not, I'd fill with epoxy (out of the water job) and filler material and touch up the bottom paint. Epoxy is strong stuff and you'd never have to worry about again. I would just be a little nervous about pluging with something that wasn't intended to be there. I know that my depth meter from SR Mariner (brand I am going with again when boat units permit) came with a blank plug for use while the depth transducer is removed. Maybe you can call your manufacturer and see if they offer same. Good Luck!

Patrick Burnett, Little Rock, AR
S/V Lucky Star #2707 1982 SK/SR
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mroettersr
Navigator

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USA
148 Posts
Response Posted - 09/13/2002 :  00:32:57  Show Profile
When I bought my C25, the knotmeter was kaput. My son, whose is an electrical engineer, took the meter apart and found some light corrosion on the electrical contacts. Since the voltage is very low from the pickup, this was enough to make the meter inoperable. He cleaned the contacts and reassembled the meter while I used a bleach solution to thoroughly clean the paddle pickup. The meter works fine - but I had to recalibrate it with the GPS. You may want to see if you can make the meter work again. Incidently, I like to use both the knot meter and the GPS as one give velocity through the water while the other gives velocity over ground. I have a plug the fits the hole (provided by the manufacturer) that can be put in place while the pickup is out for servicing.

As far as patching the hole is concerned, there are proceedures that should be followed to ensure a strong lasting repair. Most books on fiberglass boat repair should cover this. Moreover, the West System web site probably has an article on this as well(www.westsystem.com). As I recall, multiple layers of glass cloth and epoxy are applied to the hole after the sides have been flared out. I wouldn't trust filling the hole with resin and filler as you are relying on a small contact area between the patch and the hull. Flaring the hole and using cloth and resin in layers should provide a patch as strong as the original hull.

Good luck.

Mike Roetter
'83 C25 #3568 SK/SR
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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.