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Last weakend I made a trip to the gorge for kokes I didn't really see any fish on my finder -only twice while trolling as soon as I gave the boat some gas and started cruising I began marking fish I know some fish are scared off by the boat noise but not all my fish came shallow some where at 26,30,and even 48 has anyone else had this problem? Maybee my transducer angle is off its a older eagle finder I really don't know the year it is any help would be great
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I get the identical problem you have. It could be the transducer angle as you think but this is not the problem on my boat. Depending on the boat design in the back and the where the keels are you like me are probably getting a whole lot of bubbles going over there. I have tried puttin to another spot but then the engine noise shakes up the cable and I get this at the faster speeds. It has helped mine to put some more screws and secure the cable better but still can't help with the engine noise.
So I basically have the same question, has anyone found any coating material that will maybe "muffle" the sound from the gas engine?
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I had a similar problem with my finder some years ago and I called the company to find out what was going on. They said that I would need to put some kind of insulating material between the boat and the transducer. Wood will work but teflon is better because it won't rot. After installing the insulator I had no more problems. Just don't use the same screws to mount the insulator to the boat and to mount for the transducer. You don't want the metal of the mount to make contact with the hull of the boat even if it is the screws that are making contact. I agree with you on the bubbles causing the fish marks when taking off, lots of boats will do that.
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So how big if a teflon piece would you recommend? And you said to first connect the teflon to the boat, then use seperate screws to connect the transduver to the teflon piece, what kind of screws did you use to do this?
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[inline IMG_1804.jpg]The one I made is about 6" long and 4" tall. I would have gone bigger if I could have. 8" wide would be nice, but as you can see my hull shape made this transducer mont very difficult. I do not read well at speeds over 20mph due to the way the transducer has to protrude below the hull in order to be at the proper angle. But below that I am fine.
I used a piece of plastic cutting board. I attached it with a whole load of 3M Marine silicone adhesive that I spent a wad on at Boaters World. I used 2" stainless steel screws, my material is 13/16ths" in thickness. I think they were #10's.
PRE-DRILL AND COUNTERSINK!
Then coat the threads of the screws and run them in till they are snug, Don't tourque then to much. The screws and glue in combo will have no problem holding, this is about waterproofing holes in the hull below the waterline. Silicone will oozze out of sides of mounting plate, this is good.
Give it a day to set up and mount your transducer. I used 3/4" #8 screws. They are 1/16 shorter than the thickness of my material and the transducer bracket and washer probably take up another 3/32nds, so I have about 1/8 between the hull and screw tip.
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], I did mine very similar but the teflon was thicker, only because that is what I had on hand. Good luck with yours.
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