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In article 6yage.73235$c24.21202@attbi_s72, says...
Most boats have a spot in the hull that is nothing but glass. Some paint
this area black so you can find it. Others leave it clear and it will show
up as a clearer area.
To make sure it will work at this spot - fill the bilge with enough water to
cover the area by about 1/4". Lay the transducer on this spot and check.
The transducer will not work thru any air pockets so you have to put some
water in there to try.
To install - I use silicone. People will tell you not to but I have always
done this with no problem. Build up a large area of silicone about 1/2"
thick. Take the transducer and push it down all the way pushing out all the
excess. Don't twist. This will remove any air bubbles. Take and wipe up
the excess w/ papertowels being careful not to move the transducer.
Problem w/ epoxy is you need a lot to push down and make sure there are no
air bubbles.
Thanks Tony, This is an old Four Winns (1985) Catalina open bow, and
the area I have been looking at just forward of the drain plug may indeed
be all glass the whole way through. I compared to the depth transducer
mounting on my brothers Stratos, and his is simply glued on exactly as
you have described. As for the silicone RTV glue, you are right on the money
there. I have glued ultrasonic doppler transducers to PVC pipes for many
years, and RTV is at least 90% as conductive to sound energy as any of the
lavishly expensive glues sold specifically for transducer mounting.
I went ahead and RTV glued the bugger in. I will launch tomorrow and
see what happens. I'll let you folks know the outcome, and hope it's
a positive one. As I said, if it even works down to 20 feet, I'll be happy.
I was guessing if there is core material, it is probably somewhat
water-logged anyway from 20 years of service, and that would actually be
an advantage in this case.
Bless all, Gummi.
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