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 replacing the knot-meter through-hull		  New Topic  Topic Locked
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KYD516
Deckhand

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USA
24 Posts
Initially Posted - 04/05/2013 :  21:12:12  Show Profile
Hi, My through-hull for the knot-meter failed recently while the bottom was being cleaned by a diver. It popped right out because the plastic through-hull that houses the knot-meter crumbled right where the pin went through. He stuck his glove in to keep the boat from sinking and made a makeshift plug. Fast thinker.I recommend y'all check yours. My boat is '85.

How do I replace the through-hull that houses the knot-meter? It's plastic with a screw-down.

Do I have to heat around it? Hammer? Looks like it's going to be a real pain.

Can anyone please advise?

Thanks
Aquila, rhymes w/ Tequila
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Voyager
Master Marine Consultant

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USA
5378 Posts
Response Posted - 04/08/2013 :  19:08:30  Show Profile
Have you tried to loosen the screw down? Does it budge at all? Once you remove it, then you have to decide: do I need a knot meter? Can I get by with a GPS/chartplotter only?

That depends. Do you sail in currents? If not, a GPS is plenty, so glass up the hole and say amen - you did not sink your boat.

If you have tidal currents or river currents to deal with, my preference would be to have a knot meter.

Why? I want to know my speed over ground (GPS) and speed through to the water, to determine what the current speed is. While NOAA does a great job predicting currents, it is guaranteed to be wrong due to the sensitivity of current to prevailing wind conditions.

I rely on my knot meter until it gets all gunked up in August. Then I punt.
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glen
Captain

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359 Posts
Response Posted - 04/09/2013 :  10:55:36  Show Profile
I posted this last October with the hope someone could avoid the situation you went through. Thank goodness all went well.

"Though I understand the benefit of the proper knot meter, for me the information from the GPS is good enough. So a few years back when the original meter quit, I never bothered to look for a replacement. Last year I decided to glass in the hole in the bottom of the boat, where the paddle wheel was inserted. To my surprise the imbedded socket (I think it was nylon) pretty much crumbled in my hand. This was an original install from 1979, and who knows what solvents it has been exposed to (bottom prep and painting, not to mention the not so pure water it sits in). However this is a plastic not bronze through hull, with no shut off (unless you are there at the right moment in time and happen to have some sort of a plug. If I was to replace this piece of equipment, I would not worry about finding something that can fit in an old socket. I would consider replacing the entire operation, and I would check to see if anyone offers one with a bronze through hull"
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Voyager
Master Marine Consultant

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USA
5378 Posts
Response Posted - 04/09/2013 :  20:11:39  Show Profile
Last year on the hard I tried pulling the plug just to see how hard it would be to do in the water (in August). Mine was pretty solid, but as you point out, it could have been compromised by age, exposure, formulation, what have you…
I'll check it again on the advice of this post, as a mast sticking up from underwater could REALLY ruin your weekend.
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CarbonSink62
Navigator

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USA
208 Posts
Response Posted - 04/10/2013 :  14:41:35  Show Profile
Don't the new and improved depth sounders also do speed?

My plan has been to leave the installed sensor alone (I'll check it for integrity, based on the above) and replace the readout with a Depth/Speed from Raymarine.

I think the new 'ducer can get depth, speed, & temp just going through the FG hull. No drilling needed.

What a world.

Ken
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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.