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 Catalina 25 Specific Forum
 Paddle Wheel Removal Decision		  New Topic  Topic Locked
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Deric
Captain

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USA
408 Posts
Initially Posted - 04/17/2008 :  20:43:06  Show Profile
Hello Folks,

I am interested in your opinions.

I have been contemplating removing the paddle wheel because the original knotmeter that came with the 78 boat is shot. The knotmeter had too many rattling parts inside. I figured for the type of sailing I would be doing a GPS would be good enough to track speed.

If I remove the paddelwheel, I'll have a large hole in the hull that would need to be fiber-glassed. Due to the large size of the hole - -app 2 inches in diameter - - I thought maybe it may be best to leave the paddlewheel in place and not bother with it.

My dilemma of deciding to remove it, or not, is based on knowing that less holes in a boat is preferable, yet, also knowing that removing the padde wheel will result in a large size hole, which sounds like a huge job.

Thanks for sharing,

Deric
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dmpilc
Master Marine Consultant

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USA
4593 Posts
Response Posted - 04/17/2008 :  22:49:01  Show Profile
Could you replace the paddlewheel with something else, like a depth gauge transducer, or do you have that already? If so, I would be inclined to leave it alone unless it is leaking.
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GaryB
Master Marine Consultant

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USA
4316 Posts
Response Posted - 04/17/2008 :  23:06:35  Show Profile
Deric,

Not sure if you have the same brand of knotmeter I have (SR Marine) but my boat came with a couple of dummy plugs that can be inserted into the thru hull fitting for the paddle wheel or depth finder. The dummy plugs are made of plastic, are approx. 2" in diameter, and slip into the thru hulls to seal them off if you need to do repairs. You may be able to find one of these on EBay or possibly from the manufacturer of your knot meter.

Here's a link to what I'm referring to --->>> http://www.srinstruments.com/Mariner/Item-Display.asp?URI=1089

Here's a link to a SR Marine paddlewheel transducer --- >>> http://www.srinstruments.com/Mariner/Item-Display.asp?URI=1112

Not sure if any of these parts are still available but a few phone calls may give you a lead to repairs or replacement.
Edited by - GaryB on 04/17/2008 23:20:59
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John Russell
Master Marine Consultant

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USA
3444 Posts
Response Posted - 04/18/2008 :  09:49:46  Show Profile
I'd leave it alone and just not use it. That thing has been water tight for 20 years, it's unlikely to start leaking. You don't really gain anything by pulling it out. Okay, I know there must be someone out there that can calculate the fraction of a second loss due to increase drag on the bottom.
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OLarryR
Master Marine Consultant

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USA
3494 Posts
Response Posted - 04/18/2008 :  11:24:10  Show Profile  Visit OLarryR's Homepage
I agree, since there apparently are no water leakage/structural deficiencies with the fitting - "If it ain't broke, don't fix it". Whatever resistance there is with water flow over the paddle wheel (that will no longer be used) has got to be negligible. So, then out of sight out of mind. I would leave it alone. Then you have more time for sailing or a new improvement project.
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crcalhoon
Captain

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USA
303 Posts
Response Posted - 04/18/2008 :  16:55:28  Show Profile
The yard set my boat down with the paddle wheel against a jack stand pad and bent all the little vanes. I don't care. The instrument was shot anyway. It doesn't leak and I can stand the loss of l/1000th of a knot.
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OLarryR
Master Marine Consultant

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USA
3494 Posts
Response Posted - 04/18/2008 :  17:32:39  Show Profile  Visit OLarryR's Homepage
Not to detour this posting but you gave me an idea - Why not all list the things that marina workers have broken while servicing your boat !

For me, it when they were using the travel lift to deliver my boat to the maintenance yard. The fairly new Windex w/bird preventer spike on top of my mast was despiked by an overhead branch ! But the wind indicator part of the Windex is fine - I left it as is.
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 04/18/2008 :  18:37:09  Show Profile
When I first got my C25, it had two thru-hull depth transducers, one operational and one not, and I was content to just leave it that way. After my knotmeter conked out, I installed a new one in a different location which then left me now with two derelict devices protruding thru the hull. That must have been my limit because I ended up removing both of them and patching the holes. (repairing them by the way, is not difficult project).

If you don't have a dummy plug, I'd be inclined to leave things the way they are.
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Deric
Captain

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USA
408 Posts
Response Posted - 04/18/2008 :  21:13:31  Show Profile
Hello Folks,

Thank you for your suggestions. I shall leave the paddle wheel in place as a keepsake item.
I had no idea there were dummy plugs, which is good to know about. Perhaps in the future, I may replace the wheel with some other transducer. I just patched a hole from an old depth transducer today; the hole was about 3/4 inch in diameter so it was easy to patch. I wasn't looking forward to working on a 2 inch diameter hole though.

BTW - Out of the entire area space of the hull, it figures that the boat yard would break the paddle wheel by placing it on the jack stands as one reader has posted. Must have had "bulls-eye" painted on it eh?

Deric
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 04/18/2008 :  21:21:13  Show Profile
That's why they make dummy plugs. Before they haul me out, I remove the paddlewheel and put in the plug then leave the plug in until I'm back in the water.
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sweetcraft
Admiral

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USA
816 Posts
Response Posted - 04/18/2008 :  22:13:11  Show Profile
I've done that too but I make sure I am tied to the dock and have a towel handy for the cup of water that get in so make sure you have the plug handy too. I tie the plug right to the hull fitting so mine is ready.
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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.