Mounting Fishfinder Transducer on the inside

[summertime12]

I have a Bayliner 185 Fish & Ski and would like to install a fishfinder without adding additional holes, is it possible to mount the transducer on the inside of the boat and still have the fishfinder work 90%?
I am not comfortable with the ideal of drilling holes into my new boat , pictures of installation will help :mad-new:

 

[moosehead]

Yes, many transducers can be mounted in the hull and will provide a decent level of sensitivity, though it will be diminished to a degree and you'll not maintain any thermometer reading capability for water temps. You'll need to still locate the proper position that provides no turbulence and that will provide 100% of signal through water in any speed. You'll also need to either mount the transducer in a a PVC pipe section of water, or using an adhesive that will cure with no air bubbles to provide for best signal.

 

[jigngrub]

3-5 screw holes on the outside of your transom won't hurt anything if you use 3M 5200 to seal them with.

I do suggest running your wire exposed on the outside of the transom and not drilling the 5/8" hole for the transducer wire connection.

 

[ricohman]

For my new boat, I used a Sternmate mount on the outside. No holes needed.

 

[Starcraft5834]

As jig said.. wont hurt a thing. Mount it outside properly so it works as it should

 

[thumpar]

If I was going to do it (have thought about depth gauge install) I would do thru hull. I don't like the look of stuff hanging of the transom except the outdrive.

 

[fishrdan]

Mounting the transducer shoot-thru hull should get you 90% performance (+- 10-20% )

My old boat had the transducer mounted shoot-thru hull and I liked the performance, even for fishing and picking up fish while trolling. I had the ducer epoxied into the center of the bilge. The epoxy has to be bubble free or it will cause problems, the fiberglass also had to be bubble/void free or it will cause problems.

If the transducer has any type of side imaging, tri-finder, temp or speed, these features will not work with the ducer mounted shoot-thru hull. And I'm guessing DI (down imaging) may not work either or it's performance may not be very good.