RE: [Cal_Boats] Re: depth finder - Cal 2-29

I mounted my triducer where there was the inlet valve for the head. It is off center and gives me inaccurate speed readings. On starboard tack I am the same speed as my GPS. On port tack I am either .5 or up to 1.3 slower than the GPS. The inaccurate speed messes with the wind calculations and tacking angles. Next time Out Patient is out of the water for bottom paint. I will have to center everything. Randy CAL 2 29 Out Patient Channel Islands Ca Sent on a Sprint Samsung Galaxy Note® 3 <div>-------- Original message --------</div><div>From: "'Alfred Poor' ap… [at] verizon.net [Cal_Boats]" <Ca… [at] yahoogroups.com> </div><div>Date:06/12/2014 6:15 AM (GMT-08:00) </div><div>To: Ca… [at] yahoogroups.com </div><div>Subject: [Cal_Boats] Re: depth finder - Cal 2-29 </div><div> </div>I hate making more holes in a boat hull. We have mounted our depth transducers inside the hull. Some people bed them with a gob of silicone caulk, but I prefer to make a container (a section of PVC pipe can work well) epoxied to the hull), and then filled with mineral oil (doesn’t spoil or grow critters) and suspend the transducer in the oil. Incidentally, a previous owner had mounted the transducer under the port quarterberth, and it worked fine for us there. Our Tartan has it in the bow as you describe, but I don’t have a strong opinion about location. All the best, Alfred Poor 1973 Tartan 34C #288 “Jambalaya” (former owner of 1969 Cal 29 #132 “Pentaquod”)

I would also vote for the in-hull epoxy method. In my Santana, I cleaned & lightly sanded a spot just forward of the keel, made a 1" high circular dam with duct tape, filled it with unthickened West System epoxy, gave it a few minutes to start kicking, then stuck the transducer in it. Peeled away the tape a few hours later and it's worked flawlessly since. It's the least expensive unit on the market, too (Hawkeye, I think). The advantage of the mineral oil in PVC method is that you can replace the transducer easily, should you ever need to. On my 2-27, the factory or a previous owner installed an old (70's/early 80's) d/s transducer using a big glob of silicone. It works ok, but often goes blank for extended periods and is slow to adjust where the seafloor is very variable. Older electronics are certainly a factor, but I suspect it's also a result of the inferiority of silicone as a transmission medium compared to epoxy. Definitely test things first by temporarily hooking it all up to the 12V and using a ziploc with water as your epoxy/silicone substitute to find the best spot in the boat. From: "saylorran sa… [at] yahoo.com [Cal_Boats]" <Ca… [at] yahoogroups.com> To: Ca… [at] yahoogroups.com Sent: Thursday, June 12, 2014 7:19 AM Subject: RE: [Cal_Boats] Re: depth finder - Cal 2-29 I mounted my triducer where there was the inlet valve for the head. It is off center and gives me inaccurate speed readings. On starboard tack I am the same speed as my GPS. On port tack I am either .5 or up to 1.3 slower than the GPS. The inaccurate speed messes with the wind calculations and tacking angles. Next time Out Patient is out of the water for bottom paint. I will have to center everything. Randy CAL 2 29 Out Patient Channel Islands Ca Sent on a Sprint Samsung Galaxy Note® 3 From: "'Alfred Poor' ap… [at] verizon.net [Cal_Boats]" Date:06/12/2014 6:15 AM (GMT-08:00) To: Ca… [at] yahoogroups.com Subject: [Cal_Boats] Re: depth finder - Cal 2-29 I hate making more holes in a boat hull. We have mounted our depth transducers inside the hull. Some people bed them with a gob of silicone caulk, but I prefer to make a container (a section of PVC pipe can work well) epoxied to the hull), and then filled with mineral oil (doesn’t spoil or grow critters) and suspend the transducer in the oil. Incidentally, a previous owner had mounted the transducer under the port quarterberth, and it worked fine for us there. Our Tartan has it in the bow as you describe, but I don’t have a strong opinion about location. All the best, Alfred Poor 1973 Tartan 34C #288 “Jambalaya” (former owner of 1969 Cal 29 #132 “Pentaquod”)