Mineral oil is only one option, you can also fill the “tumbler” with epoxy or polyester resin. Just use a slow cure type and be careful not to stir in any air bubbles when mixing or pouring. Air pockets (bubbles) will cause the transducer not to work properly or at all. That’s the reason you can’t use this mounting method on a cored hull. I’ve even run into a problem with a small pocket of air in the layup of the hull, I fixed that one by moving the installation over a couple of inches. You can test your desired location by using a plastic cup left over from the keg party last night. Use cheap silicone to glue it to the hull then fill it with water and fire up the unit. If it works, scrape off the cheap stuff and proceed with the “real” install. It’s also a good idea to sand the area down to bare glass.
Mark, Gratis (6115) NOLA From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Thursday, January 21, 2010 5:12 PM To: [email protected] Subject: Re: [IC27A] Depth Sounder I've always wondered how you would seal the top of the tumbler so that the oil doesn't spill out when the boat heels. Lew -----Original Message----- From: [email protected] <mailto:dbatch1%40cox.net> To: [email protected] <mailto:IC27A%40yahoogroups.com> Cc: [email protected] <mailto:tedp249%40aol.com> Sent: Thu, Jan 21, 2010 3:01 pm Subject: Re: [IC27A] Depth Sounder Two issues with inside hull transistors are getting it oriented straight down and achieving a tight bond with the hull (no air spaces). One way to achieve both is to get a plastic tumbler slightly larger than the puck, cut the bottom of the tumbler off at an angle so it will sit upright against the inside of the hull and epoxy it in. Suspend the transducer in the glass making sure it is oriented straight down., I used thin wire to small holes I had drilled in the lip of the cup. Pour mineral oil in the tumbler to cover the transducer. Pour melted paraffin (in hardware stores with the canning stuff) so it floats on the mineral oil and hardens. I did this with a non - Catalina I once owned, it worked great for 5 years and was still working when I sold the boat. Very quick and simple takes about a half hour excluding the time for the epoxy to cure, and you can place it anywhere inside the boat. Good Luck ---- [email protected] <mailto:tedp249%40aol.com> wrote: ============= I need a recommendation. I have an SR instruments depth sounder with a thru hull transducer. This instrument has been troublesome. I have replaced the transducer in the spring of 08. It ran well that year but mid way thru last season it began to become inconsistent again. I have taken the read-out to SR and had it tested and it checks out fine.. Thus it looks like the transducer again. Another $75 bucks. Considering the age of the SR sounder, I am strongly considering just going to WM and get a new one. I see they have the new units starting from $100 and are using a glue to the inside of the hull mount. Does anyone have any experience with the glue down transducers? Ted Pinelli [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] [Non-text portions of this message have been removed]
