Depth sounder installation
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1. Tech Staff questions and answers Depth sounder installation Q Jim Costello of Dallas Texas recently asked the Tech Staff about mounting a transducer to the hull of his 1983 Bayliner Capri Classic The user manual for my new Hummingbird fish finder says that the transducer can be in stalled in the hull with a slow curing epoxy It says to try to eliminate all bubbles have 105 206 404 and 406 on hand What if I just mix up some peanut butter thick paste and use that Or do you have any other suggestions can mount the transducer on a part of the hull that is thin enough for the application according to Hummingbird Thanks Depth sounder manufacturers generally recommend using low viscosity slow curing epoxy when their transducers are in Stalled in fiberglass hulls This is because air bubbles interfere with a transducer s sig nal and low viscosity epoxies are less likely to trap air bubbles between the trans ducer body and the hull than higher viscosity types or those thickened with powders Placing the transducer in the ideal location is critical for the transducer to operate properly Air bubbles that can form between the hull and the water while the boat is moving will weaken or cause the signal to be lost So follow the manufacturer s instructions care fully to identify the proper location for the unit This method should only be used on solid not cored fiber glass Cored hulls will interfere with the sig2. nal The area you select needs to be clean and abraded so the epoxy will stick well Abrading can be done with sandpaper or a fresh wire brush Norton makes a circular wire brush EPOXYWORKS Number 25 Summer 2007 2007 Gougeon Brothers Inc All rights reserved called a Rapid Strip Brush that mounts in a drill motor and will work nicely for this Installation instructions recommend creating a circular putty dam that is slightly larger in diameter than the trans ducer itself Into this area pour enough slow curing epoxy WEST SYSTEM 105 Resin and 206 or 209 Hardeners to bridge gaps between the transducer and the hull To install the transducer tilt the unit on a 30 to 40 angle above the epoxy and slowly lower it into the epoxy As the corner of the unit touches slowly allow it to level out This should eliminate air that could otherwise become trapped if you were to just set the unit straight into the epoxy If the hull is angled in the area where you intend to mount the unit you can shim the unit with a piece of cured epoxy to level it before using the method described above to install the transducer E Pouring an air free transducer base Drain neat epoxy through a hole in the bottom of a cup leaving the air bubbles at the surface Putty Dam 1 of 1
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