Fishfinder loses bottom at higher speeds

[starkyb]

I just bought a new Humminbird 798 fishfinder that loses the display as get on plane on my aluminum Tracker that has 2 rows of rivets that span the the width of the boat on the very back edge. I mounted it far away from the prop and about an inch below the bottom of the boat. If I mounted a thin sheet of aluminum to the bottom of the boat just in front of the transducer would the cut down the amount of bubbles from the rivets?

 

[NYBo]

Re: Fishfinder loses bottom at higher speeds

The transducer is mounted too low, for starters.

 

[starkyb]

Re: Fishfinder loses bottom at higher speeds

if I raise it up wont the rivets cause interferance?

 

[NYBo]

Re: Fishfinder loses bottom at higher speeds

They might, but the current mounting position is doing so already. Raise it and see how it works. You may then need to work on your thin sheetmetal idea.

 

[starkyb]

Re: Fishfinder loses bottom at higher speeds

Ok thanks. My boat goes between 35 and 38 at wot. Have you heard of Humminbird fishfinders with a si transducer not working at that speed. I just want to know if it is possible to achieve a good reading if everything is installed properly and do you have any other suggestions?

 

[foodfisher]

Re: Fishfinder loses bottom at higher speeds

Pretty good feedback at Hbird.