“You can’t just plug a 2” hole if you decide transducer is no good.”
Yes you can in fact. May not be a 1 day job but is done frequently but must be done properly I do however echo the sentiment about using the holes for any existing transducers. A C&C 36 was a pretty large and expensive boat for its time and most owners had speed, depth and wind instrumentation, Likely DataMarine (is what we had in our ‘81 36). Many boats also had solid core extend either side of centerline approx. 8 inches just for this purpose. Your problem comes when the old transducer is smaller or larger than the one you have purchased. If smaller then temporarily affix a piece of thin plywood or similar inside and use that for the center drill bit in your hole saw. If new transducer is smaller diameter then you will need to spend some time thinking about it but I would shop around for a compatible transducer of the same or slightly larger size. To install a transducer in an area if it is indeed cored then as others have suggested use a hole saw of the correct size for the transducer, then dig out the surrounding areas of core (likely ¼ - ½ inch is enough. Fill with thickened epoxy (I use West 105/205 and 406 or 407 additive. Wet the areas with raw epoxy first and then fill with the thickened. As Josh Muckley states you fine a tube of same diameter and wrap with a release agent. Saran Wrap works reasonably well for this. 24 hours later you should be able to install your transducer. I would use 3M 4200 or similar. I like things to stay. Good luck. While this is not rocket science you do want to take care to do it right and not rush the job. You should also have existing holes for the old transducers Mike Persistence Halifax From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Petar Horvatic via CnC-List Sent: Monday, May 02, 2016 12:07 PM To: cnc-list@cnc-list.com Cc: Petar Horvatic Subject: Re: Stus-List West System cored hull time to cure Usually hull is tapered only where thru-hulls already exist. Factory doesn’t leave spare tapered areas for future upgrades. I don’t want to sound discouraging, but I think long and hard before drilling even a smallest hole that can sink me. And you're talking about 2" and trying to get it done at crunch time. See if you can re-purpose and re-organize thru-hulls in a way not to drill a new ones. Do you have an existent transducer you can take out? You might be able to install it on the inside of the hull with good results. There are plenty of articles on that. I had a transducer for Datamarine sandpiper in a non-tapered area and took it out to re-purpose the hole. I found that PO did not install it properly. RTV-like silicone was used and balsa was not taken out. I was lucky that area was dry. In your case, you can definitely fast cure the stuff, especially in FL. Maybe get pre-made paste like interlux watertite. Mixing microfibers with west is a pain. 5200 will definitely still be tacky but that can cure under water. Also don’t forget to ask what would it take to undo what you just did. You can’t just plug a 2” hole if you decide transducer is no good. Petar Horvatic Sundowner 76 C&C 38MkII On the hard at Stanleys in Barrington
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