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Author Topic:   Interphase Twinscope Transducer Mounting
mikeme posted 06-28-2002 12:31 PM ET (US)   Profile for mikeme   Send Email to mikeme  
Help! Anyone ever try to mount the huge Interphase Twinscope transducers to a Montauk? I can't get these things to 'stick'. The drag created by these two transducers are more than the mounting screws can take. The transducers either come loose or fly off at running speed ripping the screws out. The only thing I have accopmlished is adding larger or more holes on my transom. If you have seen these transducers, you will know normal mounting cannot be accomplished on a Whaler's foam injected hull. Any suggestions or information would be appreciated.
SSCH posted 06-28-2002 07:28 PM ET (US)     Profile for SSCH  Send Email to SSCH     
Mount the tranducer nearer the engine in the wood insert in the transom with 1 1/2" #12 SS sheet metal screws and use an adhesive like 5200 as a bedding compound. (If you ever need to remove this you'll need a heat gun and a lot of patience. You will probably destroy the transducer removing it.) Be sure to counter sink the gel coat around the screw holes before you start the screws to avoid cracking the gel coat with the act of inserting the screws. Choose the port or starboard side based on whether your boat lists to port or starboard when under way. (Choose the side that runs lower.) All things being equal as to listing, the transducer mounting instructions usually suggest which side of the prop to be on based on prop effects on the transducer performance.

Yes, I know that the common transducer location is further outboard than this will allow. On my old Montauk, this location worked fine with a smaller, older transducer on an Apelco sounder. You might try mounting the transducer on a board you can mount to the boat with c clamps over the transom first to see if this spot will work for you. (Obviously, you won't use adhesive for this test!)

I'd love to hear how the unit works once you solve this problem.

mikeme posted 07-01-2002 08:29 PM ET (US)     Profile for mikeme  Send Email to mikeme     
Thanks for the reply SSCH. Have you ever seen these type of transducers? They are huge! At least 3" long by 2" thick.

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