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mounting a transducer in epoxy...silicone...etc

Old 07-22-2005, 12:11 PM
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Default mounting a transducer in epoxy...silicone...etc

Greetings all,

I have a new twin beam transducer which I picked up on ebay. It's a transom mount and I have an inboard, so I plan on mounting it inside the hull, and shooting through it.

I have heard of guys mounting them in epoxy. If so, how do you get the bubbles out of the epoxy before you insert the transducer? I fear the bubbles from mixing will refract the beam and compromise the return.

And if mounting them in silicone....same thing.

The dude from SiTex says that I should cut a small length of PVC at the angle of deadrise and silicone this to the inside of the hull. Then fill it with mineral oil and suspend the transducer in the oil. A cap is then fitted over the whole mess to keep water out and oil in.

Just fishing for ideas before I proceed.

Thanks for the input.
Old 07-22-2005, 12:31 PM
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Default Re: mounting a transducer in epoxy...silicone...etc

I use the 5 minute epoxy alot and have never had a problem with air bubbles before. As for the mineral oil type, I have seen that done before. Airmar's inhull transducer made for that application is pretty cheap also. Just add silicone, mineral oil or antifreeze.
Old 07-22-2005, 01:22 PM
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Default Re: mounting a transducer in epoxy...silicone...etc

swamppro - 7/22/2005 1:31 PM

Airmar's inhull transducer made for that application is pretty cheap also. Just add silicone, mineral oil or antifreeze.
I've used this on two different boats and both times it worked flawlessly.
Old 07-22-2005, 01:26 PM
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Default Re: mounting a transducer in epoxy...silicone...etc

If you go Epoxy fold it do not stir it !!! Stiring causes air bubbles!!!!

Good luck


John
Old 07-22-2005, 06:50 PM
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Default Re: mounting a transducer in epoxy...silicone...etc

Do not use silicone under the transducer. It's fine for sealing around the P79 holder, but not for under the transducer. You want a solid connection between the bottom of the transducer and the hull...so use a slow set, thick epoxy to fasten it down.
Old 07-23-2005, 07:15 AM
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Default Re: mounting a transducer in epoxy...silicone...etc

You want a solid connection between the bottom of the transducer and the hull...
Exactly. A material that will conduct high frequency sound waves, not absorb them.

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