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If you already have a shoot-thru transducer then why are you installing a transom mount unit? Are you not happy with the performance of the one you have? I did mount one on the outside of my first boat and unfortunately you have to drill some holes in the hull to mount it. My second boat had the shoot-thru type and it seemed to work fine. You may get less interference from the transom unit but I doubt it is a significant difference
I now have a Humminbird Side-Finder so it is mandatory to have it on the outside.
I'd also suggest shoot through. Learned from Jeff Boyer, ( Lowrance Pro Staffer) what Marc mentions about clean water movement after I had drilled holes and mounted it in the only area I could, that happend to be on a spot where an angular part of the hull met the transom. Never got over 22mph with it working. (Lowrance LMS337C) . By mounting inside you can find a level spot on the bottom and put it there. Don't epoxy it down till you test it all speeds. Do it on the water.......... Dry fit with modeling clay around it, then a slow drying epoxy, is the answer to the next question.
Steve
Posted by Tom Melowitz on September 7, 2019 at 2:45pm
Posted by Eric Urstad on April 3, 2019 at 7:38pm
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