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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 05-15-2007
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plugging holes...

Hi there,

We are considering removing our fairing block and transducer and replacing with an "In-Hull" model. What is the best way to repair the hole after doing this? I have seen a few methods, but would love pictures or words of advice from someone with first hand knowledge of such a procedure!

Thanks Everyone!
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Old 05-15-2007
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When I did mine I just sanded the inside of the hull around it then put down a few layers of glass, let that set up and then faired it from the outside using thickened epoxy. Very easy and my boat hasn't sunk yet.

On a seperate but related note, I'm still trying to get my in hull transducer working.
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Old 05-15-2007
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On a seperate but related note, I'm still trying to get my in hull transducer working.[/QUOTE]

What seems to be the problem? Is there air space between the unit and the hull? How did you choose to mount it?
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Old 05-15-2007
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Quote:
Originally Posted by txmatt
On a seperate but related note, I'm still trying to get my in hull transducer working.

What seems to be the problem? Is there air space between the unit and the hull? How did you choose to mount it?
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Old 05-15-2007
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Quote:
Originally Posted by scurvy
What seems to be the problem? Is there air space between the unit and the hull? How did you choose to mount it?
I attempted a mount with a putty-type epoxy which is clearly not going to work, so I removed it before it set up completely. I'm going to try to sand the area smooth again, get it clean and use west expoxy thickened with high density filler.

I'm trying to put it in the bottom of my keel, which I'm afraid may be too thick to get a good reading through, but it would be really nice to have the depth reading be the depth under the keel and on the centerline. I did get it to work when I was initially testing it with a little water in there and applying pressure to the transducer.
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Old 05-15-2007
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Quote:
Originally Posted by txmatt
When I did mine I just sanded the inside of the hull around it then put down a few layers of glass, let that set up and then faired it from the outside using thickened epoxy. Very easy and my boat hasn't sunk yet.

On a seperate but related note, I'm still trying to get my in hull transducer working.
First, you really need to patch the hole that the previous transducer was in with glass from both sides... grinding it out to about a 12-to-1 bevel... and then filling it by laminating glass over it from both sides... doing it just from the inside is asking for a problem later on IMHO.

As for your in-bilge shoot-through-the-hull transducer, you might want to use the PVC pipe and mineral oil method that I normally suggest. It seems to work far better than using putty or epoxy from what I've seen.
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Mounting the transducer should be easy. Sand area just larger than the transducer smooth inside hull where you want to mount it. apply a nice big glob of polysulfite caulk to transducer and press firmly into place. Make sure to push down firmly removing any air in the caulk. Let dry. (You may need to tape the transducer in place until it dries.) The polysulfite dries solid enough to give an accurate reading and yet can be removed later if needed. The PVC pipe and mineral oil method does work well, but why do all that if you don't have to.

Most modern depth sounders have the ability to show the depth under the keel reguardless of where you mount the transducer. There should be a setting called something like "keel off-set" that allows you to input the difference in depth between where the transducer is mounted and the bottom of the keel. I personally prefer to know the true depth of the water not depth under keel.
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Old 05-16-2007
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Polysulfite sounds like the trick! I will look into it!
Thanks T34C and all who have contributed!
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Scurvy-

Just be aware that Polysulfide-based sealants tend to attack most plastics... and if the transducer has any plastic in it...it probably will not like the polysulfide sealant or play nice with it.
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Old 05-16-2007
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Quote:
Originally Posted by sailingdog
Scurvy-

Just be aware that Polysulfide-based sealants tend to attack most plastics... and if the transducer has any plastic in it...it probably will not like the polysulfide sealant or play nice with it.
While that is a possiblity, my current unit (with plastic puck transducer) is currently mounted in its second boat with no problems. I still have an older unit that was mounted in a previous boat the same way for several years and shows no signs of affect from the polysulfite.
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