"Phil Abuster" wrote in message
...
Transducers will work throught the hull from the inside if properly
mounted in a bed of epoxy.

Here's one example:

http://www.starmarinedepot.com/Rayma...ransducer.html

I've mounted a thru-hull inside the hull bedding in epoxy (make sure no
air bubbles in epoxy) and it works great.


They don't need to be mounted in epoxy (those not going through the hull) to
work properly. They do need to not shoot through air. If you mount them in
epoxy, you'll find it difficult to remove them if they fail. In the method I
mentioned elsewhere, you don't have to be concerned with bubbles in the
epoxy because the transducer sits in mineral oil in a stable container (one
that is epoxied to the hull in the appropriate spot). The main issue is
finding a spot via testing (as another suggested) before placing the
transducer holder.

--
"j" ganz @@
www.sailnow.com