Join Date: Sep 2011
Location: Liberty Landing
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Rep Power: 6
depth sounder thru-hull
Well I already installed mine, but I think it would be helpful to others considering doing this themselves to post my concerns.
I didn't want a through-hull transducer, but after ordering the transom mount one, and calling for technical help on where to locate it, the customer service guy from the company told me that the transom mount would not work for a sailboat.
So I returned it and got a through-hull. Of course, the instructions didn't tell me where to mount the through-hull, and the customer service guy for this one couldn't tell me where to mount it. The through-hull is made by airmar, and no instructions for the installation were included. A quick google search told me they are in France, and with limited time before I was getting my boat in the water, I was getting frustrated. So I looked around, and saw that other sailboats in the marina mounted these things just in front of the keel. So that's what I did. There is some deadrise in the hull in that area, so I tried to drill the through-hull as close to the centerline as possible.
Of course, the glass at the centerline is thicker and gets thinner the further from the centerline you go. So when I screwed down the through-hull, there was about a 3/16 inch gap on one side on the outside. I used a thin strip of Butyl around the outside of the through hull, to seal up the gap itself, and under the outside lip of the through-hull I used boat life, to try and seal the gap and because supposedly butyl shouldn't be used under the waterline.
The boat is in the water and doesn't leak, but the through-hull could feel more solid. It is also at about a 10 degree angle, so I am concerned about accuracy...
Is this gonna work out OK? What should I do in the future when installing transducers on keelboats?