I have the pointy end type from Garmin. It is mounted to port of the keel (about 2 ribs), under the bunks and about 4 inches forward of the bulkhead. I made a puddle of 100% white silicone rubber, about 2 inches in diameter and 1/2 inch high and simply pressed the transducer into place...held it in place for about 5 seconds and it hasn't moved since. That was about 4 years ago. It has worked right since day one. You can see the depth to bottom, bottom type (by grayline), submerged trees, weeds, fish echos....everything. BTW, being able to see the bottom content is a big help when deciding where to drop the anchor. If there is crud down there to hang up on, you can see it. Howard On Jun 19, 2006, at 4:03 PM, Bill Lamica wrote:
Hi Rick, Here is a guess. I heard the transducer that looks like a boat hull (pointy front, square back) does not work as well as the round puck style used for the shoot through the hull applications. If I used the transom mounted style, I was told to build a round berm of silicone sealer, add Squibb mineral oil and carefully embed the pointy end forward with no air bubbles in the oil. That sounded like a major pain, so I ordered a 20 degree round one and it worked fine with the silicone only. That was a while back with an Eagle unit. The info may or may not apply.
Did you get the chance to look at Norm Bundek's Sonar installation? album: http://www.msogphotosite.com/M15Sndr.html He is using the boat hull type installed just as you mentioned (of course proving my theory wrong) so he may have some further information.
Just to make a point. The same Eagle I mentioned also came with a portable housing and a couple of lantern batteries. I beat the crud out of it and never damaged the transducer. Howard is absolutely right... they are tough! Bill _______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats