Installing thru hulls in the water?? - Page 2 - SailNet Community
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post #11 of 22 Old 08-17-2013
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Re: Installing thru hulls in the water??

what type are there now do you need to change the whole thing or just put the new sensor into the old housing? the Santana 30 is a solid glass hull so the depth transducer can go on the inside of the hull

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post #12 of 22 Old 08-17-2013 Thread Starter
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Re: Installing thru hulls in the water??

No clue what's in there. I do have a speed sensor but not sure what type. It's a very old mariner brand speed instrument that does not work.

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post #13 of 22 Old 08-17-2013
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Re: Installing thru hulls in the water??

you will need new housing for the speed sensor but for the depth you can mount on the inside of the hull p79 type http://www.airmartechnology.com/uplo...hures/P79S.pdf
you really don't need speed sensor unless you are racing. and in the area you sail you do not need a depth sensor either. the only shallow water with in 200 miles is the Isthmus on Catalina Island. only thing I have used one for is to tell if the water is to deep for my anchor.

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post #14 of 22 Old 08-17-2013
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Re: Installing thru hulls in the water??

If your hull is non-cored then you can install the depth transducer to shoot through the hull. This is done by bedding it in toilet ring wax (reversible) or epoxy (harder to undo). There are tons of threads covering this procedure on almost every sailing forum.

If your need speed transducer using the same housing as the old one (consult with Airmar, there is a 90% chance that they made both of them) then you could swap the speed transducer without swapping the housing. This will let in a little water, but is a normal procedure. You may find that pulling your speed transducer (locate the blanking plug first) and cleaning it will get it back to reporting proper speeds.

Otherwise haul the boat.

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post #15 of 22 Old 08-17-2013
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post #16 of 22 Old 08-18-2013
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Re: Installing thru hulls in the water??

I've seen it done many times and with the right persons involved it only takes a few minutes. A friend and I installed a new thruhull in his boat with no issues a few months ago.
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post #17 of 22 Old 08-19-2013
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Re: Installing thru hulls in the water??

Most boats today are fiber glass and new drilled holes should be sealed with epoxy to prevent moisture spreading before the parts are installed . Hard to do that dockside.
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post #18 of 22 Old 08-19-2013
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Re: Installing thru hulls in the water??

This is one hull cleaner who has advised more than a few boat owners to haul out for this sort of job. My personal opinion is that there is too much potential downside in attempting this and very little upside (for me, anyway.) Basically I can't charge enough to make it worth the risk or anxiety.
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post #19 of 22 Old 08-19-2013
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Re: Installing thru hulls in the water??

yup it could be done,but I wouldn't risk it!,my depth finder gave up the ghost last year and I bought a little hummingbird and epoxied the tranducer inside the hull,it works so well that I bought another one for the other side,i had my boat hauled this spring but decided not to replace the little humminbirds [if it ain't broke don't fix it]
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post #20 of 22 Old 08-19-2013
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$20,000+ > $500. Simple Math.

I amazed that that anyone would even consider this. To save a few hundred dollars, your going to risk several $10's of thousands? The chances for failure seem extremely high.

I had a similar situation occur to me this spring. Launched the boat. A thru-hull that didn't leak last year, was slowly weeping fluid (teaspoon every 5-minutes) at the flange/hull junction. Probably could have made it through the end of the season. Made the decision to have the yard guys yank the boat 2-hours after it was put in at a cost of $330. Decided since it was out to do all the old thru-hull at the same time. A couple hundred more in new thru-hulls and now everything is brand new and doesn't leak and won't until I probably sell the boat.

The cost of something going wrong with an in-water replace is way more than you think. Probably loss of boat, cost to raise the sunken boat, and god forbid if you release diesel/gas in to the water. Then you have a real mess on your hand.

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