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Old 09-21-2012, 08:01 AM   #19
rwidman
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City: North Charleston, SC
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Quote:
Originally Posted by BruceK View Post
.................... Eventually I fitted the transom mount transducer included with the unit, inside the bilge. I put a large volume of silicone in a piece of plastic drainpipe cut at the bottom to the angle of the bilge to get it horizontal at the top, put the transducer into the gloop, using a small level to get the foot level. It works ok but takes a while to get a "grip" on the bottom on start up. BruceK
I suspect that's because the silicone (I'm assuming a caulk like product) is absorbing the signal from the transducer. Water (or antifreeze) will work fine because it conducts sound just as the water under the boat does.

If you want to glue the transducer directly to the inside of the hull (and have a horizontal surface available and no coring), you will do best with a rigid adhesive like epoxy, not something flexible (like silicone) that will absorb the transmission from the transducer.
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