That is correct, so it looks like an upside down mushroom when mounted in the silicone.use a good size glob of silicone and make sure there are no entrapped air bubbles in it before you attempt to mount the transducer.as the excess squeezes out some will rise to just about the edge of the mushroom..I would guess the thickness of silicone between the transducer and the hull when you have it mounted won't be much but it must not contain entrapped air bubbles, just won't work well if it does.I simply held mine down hard for a few minutes not until the silicone had fully cured but within a day the silicone had cured. My boat was in the water when I did the mount so I was able to get instant feedback. Holes in the hull are the primary reasons we all carry plugs
_____ From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Stevan Plavsa Sent: February 13, 2014 10:51 AM To: cnc-list@cnc-list.com Subject: Re: Stus-List Drill another hole? Dwight, I believe the ST-60 uses the same transducer as the ST-40 that I have. Yours is designed to be used as a thru-hull correct? Steve www.sv-suhana.com/ Toronto On Thu, Feb 13, 2014 at 9:38 AM, dwight <dwight...@gmail.com> wrote: Steve I have a Raymarine st60 system. The transducer is the ordinary thru hull unit. A few years back I cleaned the inside of the hull well with acetone in the spot I wanted to mount it and simply plunked it down in a big fresh glob of GE 100% silicone sealant.you have to plunk it down on a slant and hold it down for a while so as to squeeze out any air bubbles that might get entrapped. It has worked very well for the last 4 years. You may be able to do something like that with your new transducer when you mount it up forward and avoid making another hole. I plugged the hole that mine was in before I did the inside mount. Mine measures to 200 feet depth at least but in depths greater than 200 it fails to work so you do lose some range if that is important to you, 200 feet was fine for me. Anyway you could try it all out without drilling anymore holes and you could also mount the old one that way and avoid having to use mineral oil. _____ From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Stevan Plavsa Sent: February 13, 2014 10:07 AM To: cnc-list@cnc-list.com Subject: Stus-List Drill another hole? Hi All, I installed depth and speed last season and I re-used the old through-hull transducer (no hole) and that works fine. However, that transducer is located under the starboard settee (the one forward of the nav station) and because it needs to be encased in mineral oil (or whatever it is in there) it's in a big piece of pipe right in the middle of that storage area. Needless to say, I don't use that storage area very much and I would like to. I've also had some problems with the depth instrument, sometimes it stops reading and I suspect the old cable or the transducer. My thinking is to drill a new hole in the hull up forward (currently it's next to the keel), and install the thru-hull that came with the unit and run the new wire. I'm hoping that this will achieve two things: better working depth instrument (with full range) a usable storage compartment (valuable on my small boat) Now my question to you all: is it worth the trouble? Drilling a hole in the boat is typically avoided and I already have the following holes: Engine raw water intake Two scuppers Galley drain Head drain Head intake Speed thru-hull That would make eight with a new hole. Too many? I've replaced almost all of the thru-hulls and original gate valves with new bronze thru-hulls and proper seacocks. Thanks, Steve Suhana, C&C 32 Toronto _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
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