Curtis;
A depth sounder installed in the back of the boat won't work well, if at all, when under weigh. When sailing the turbulence from the keel will interfere, and when motoring it will be the pressure waves generated by the prop. (I think the transom mounted sounder on my 19ft Grady White works OK when below about 10MPH becayse it is about 3 ft outboard and 1 ft ahead of the outdrive. But you would be hard presses to get much offset from the prop on a sailboat.) Garmin recommends that the transducer be installed forward of the leading edge of the keel on a sailboat. I have am Airmar P79 transducer, which comes with a mount designed for installation inside the hull. It is installed on centerline just forward of the back bulkhead for the v-berth. My hull is cores, so I had to find a place where there was solid glass for the installation, or do surgery to remove a bit of the inner fiberglass skin and core (which, frankly, gave me the willies). On my 25, which is not a cored hull, I was able to use a location in the forward corner of the locker under the port settee. About even with the leading edge of the keel and a short easy run for the wires to the location of the display and the breaker panel. Your plastic bag does not need to be filled with oil, water will do. Hook your transducer to the sounder, and hook the sounder up to power, then turn it on. Place the bag on the inside of the hull in a location where you think you would like to install the transducer. If you get a depth reading the location will work. If you don't get a reading, try other locations until you find one that makes installation and access easy, and where the transducer give a good signal. Lots of guys on the list have had good luck installing transducers in a puddle of silicone or epoxy. But with either you can get air bubbles between the transducer and the hull that make it not work. I prefer to mount the transducer in a "wet box." On the 25 I used a 3" or 4" PVC cleanout cap (with a threaded plug). I cut the end of the cleanout at an appropriate angle, and then shaped it to fit the curve of the hull. Then cut a vertical slot in the threads the width of the transducer wire diameter. Epoxy the resulting wet box to the inside of the hull, Fill it part way with mineral oil. Put the transducer in, and screw the plug down tight enough to seal the hole where the wire comes out. Or, as I said, use a transducer that comes with a collar that you epoxy to the hull. Good luck. Rick Brass From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Curtis Sent: Friday, December 20, 2013 8:29 AM To: CnC-List@cnc-list.com Subject: Stus-List In hull transducer location I have purchased a new echo50s for Christmas. I'm trying to decide were to install the inhull transducer. I have had some tell me that I should put the sensor in a zip-lock bag with mineral oil to find the best spot in the hull? On A C&C 30 MK1 has anybody installed one in there hull? I have 2 threw hulls under the forward head bilge. Both will not work. any Ideas of what to look for in the bag of oil with the sensor in it to determine where is the best location? I have a depth sounder forward now. It would be nice to have one in the back of the boat somewhere. -- "Sailors, with their built in sense of order, service and discipline, should really be running the world." - Nicholas Monsarrat
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