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Old 05 April 2021, 13:56   #1
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Help, the power of Ribnet

Just purchased an Highfield RIB with an aluminium hull. Want to fit a Garmin 450 fish finder transducer and not keen to drill holes below the waterline to fit. Any suggestions would be appreciated or has anyone fitted a transducer on any aluminium hull by drilling through hull?
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Old 05 April 2021, 14:05   #2
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Sikaflex - a high adhesion version?

Either stick the skimmer base directly or stick a fillet of something to the transom and screw the base to that. Ultimately as strong as the paint is.
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Old 05 April 2021, 14:13   #3
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Sikaflex - a high adhesion version?



Either stick the skimmer base directly or stick a fillet of something to the transom and screw the base to that. Ultimately as strong as the paint is.


Ally can be tricky, similar to galv. Might need a “special”
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Old 05 April 2021, 14:16   #4
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Hi Sutty ..I screwed marine ply plates to the outside of the transom. The screws were well above the waterline and I also wanted U bolts so I can tow. They too hold the ply plate on and it is also stuck with sikaflex. Means I can screw things like transducers to the ply plates whenever I want. The screws and U bolts were put in neoprene tubing and nylon washers where they pass through the Ali transom to avoid different metals touching and corroding.

One way to do it and IMO makes a nice permanent job.

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Old 05 April 2021, 14:29   #5
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Ally can be tricky, similar to galv. Might need a “special”
Surely the Highfield is painted?
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Old 05 April 2021, 14:51   #6
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Surely the Highfield is painted?


The ones I’ve seen weren’t
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Old 05 April 2021, 14:58   #7
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Here is the pre treatment chart for Sika products. If you want to bond permanently, 292i is their structural adhesive.

https://industry.sika.com/en/home/ma...rt-marine.html
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Old 05 April 2021, 15:00   #8
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High powered magnets used a lot on glass
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Old 05 April 2021, 16:42   #9
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Surely the Highfield is painted?
Mine was 2014 and powder coated ,had a specially shaped raised area placed and drilled for garmin sensor ,check a few transoms on highfields around marinas ,i dont think theres much they hav,nt thought about
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