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Author Topic:   Mounting SONAR Transducer to Block on Transom
duckear posted 05-08-2006 02:12 PM ET (US)   Profile for duckear   Send Email to duckear  
Can a piece of KING StarBoard poly sheeting be glued with epoxy to the transom and a SONAR transducer be mounted to it? That way, no holes below waterline and if you need to adjust transducer, no problem, just remount the bracket.
aubv posted 05-08-2006 11:30 PM ET (US)     Profile for aubv  Send Email to aubv     

Yes, I installed a transducer on a piece of starboard after I adhered the starboard to the transom. I used 3M 4200 or 5200. After cutting the piece of starboard to size and marking the location on the transom I used 600 grit sand paper on the gel coat and used a razor blade to heavily score the back of the starboard. I then applied the 4200/5200 to both surfaces. Once the starboard was mated to the transom I used blue painters tape in a star pattern to hold the starboard in place while the 4200/5200 cured. The transducer was then installed as per mfg. directions.

The transducer has now been in place 3 years and a couple of thousand miles by water.

jimh posted 05-08-2006 11:46 PM ET (US)     Profile for jimh  Send Email to jimh     
I noticed that the new EDGEWATER boats are being delivered with a block of material fixed to the transom for the purpose of providing a mounting area for SONAR transducers.

I am not certain that a material like KING StarBoard can be adhered with epoxy. You may find that a special adhesive is needed.

montauk steve posted 05-09-2006 01:36 AM ET (US)     Profile for montauk steve  Send Email to montauk steve     
What is KING StarBoard made of? What type of plastic? Does anyone know? I am thinking about buying apiece of either UHMW PE or LDMW PE and use that to bond to the transome and then attach the SONAR transducer to that.


bsmotril posted 05-09-2006 07:36 AM ET (US)     Profile for bsmotril  Send Email to bsmotril     
Starboard is linear poly-ethylene plastic with UV light inhibitors added to prolong its' life under sun exposure. Nothing really bonds to it chemically. But, you can get a good bond to a boat hull with 3m 5200 via a mechanical bond if the reqr surface of the starboard is prepared correctly. I mill shallow dovetail grooves in the back with a router. The undercut sides of the grooves hang on to the cured 5200 which in turn bonds to the gelcoat just fine. BillS
PeteB88 posted 05-09-2006 11:58 AM ET (US)     Profile for PeteB88  Send Email to PeteB88     
It is extremely difficult to glue UHMW in my experience or any poly-e for that matter unless you have a reliable technique/glue. IF you do let me know. thx
bsmotril posted 05-09-2006 03:10 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
My technique is reliable. I've done multiple boats this way, some are 10 plus years without a bond failure. My technique is outlined in detail in the archives of this site. Search on Starboard plus Transducer + 5200.
jimh posted 05-10-2006 12:37 AM ET (US)     Profile for jimh  Send Email to jimh     
This tournament fishing boat has been equipped with a large plate on the transom at the bottom on the starboard side for the purpose of mounting SONAR transducers. It also has a water pickup.

PHOTO: Transom of fishing boat showing plastic plate installed for purpose of mounting transducers.

Royboy posted 05-10-2006 08:06 AM ET (US)     Profile for Royboy  Send Email to Royboy     
Jimh the plate in the picture is also screwed on, which is how I did mine. I also covered the entire plate with 5200, but two 1/4 - 20 screws do the lions share of making sure it stays put.


Royboy posted 05-11-2006 11:02 AM ET (US)     Profile for Royboy  Send Email to Royboy     
Upon re-reading my last post, I should clarify that I covered the entire surface between the plate and the transom with 3M 5200. I also sealed the two screws with same.


duckear posted 05-11-2006 05:42 PM ET (US)     Profile for duckear  Send Email to duckear     

That looks good. Anybody got any scraps or starboard they want to sell or ideas on a good place I can order a small piece?


Royboy posted 05-12-2006 03:28 PM ET (US)     Profile for Royboy  Send Email to Royboy     
email me your mailing address and I'll send you a piece.


PeteB88 posted 05-22-2006 12:02 AM ET (US)     Profile for PeteB88  Send Email to PeteB88     
Thanks for the procedure using 5200 to bond poly - E

appreciate it!

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