🚀 go-pugleaf

Many through the hull transducers work using this technique.  My echo sounder
is from the UK (Seafarer) and comes with a tube that permits the same type
of mounting.  There are a few things to look out for.  First, the composition
of your hull may cause problems.  Second, you should check the positioning
of the transducer while underway (just have it wet and place it on the inside
of the hull) to check for water or air flow problems (don't have holes in
front). Do your best to have the transducer in a vertical position.  And, have
it in close contact with the hull.  Remember, if you have a sailboat, you can
have problems when healed (unless you use two with a switch).

Mike Schneider 

*** REPLACE THIS LINE WITH YOUR MESSAGE ***

> 
>       Steve Shelley asked about an inside mounted transducer for a depth
> sounder in a previous article:
 
I used to do rigging work for several local yacht dealers, and
inside-mounted transducers were standard installation for all of
them.  Most any type of sealable container was attached to the
inside of the hull, filled with liquid (watch out for algae
growth, mineral oil or some sterile solution is best), and
capped with a plate which held the transducer.

	There are a few caveats, however, to the installation:
1.  remember that the depth will be measued from the tranducer,
NOT from the max. depth of the keel, so you need to know the
distance above max. depth of the installation;
2.  the fluid level in the container should be checked on a
regular basis;
3.  the hull may cause an echo (depending on material and
density), which can be distracting, or may resonate;
4.  the transducer mounting plate MUST be level (fore and aft,
AND athwartships) under normally-loaded conditions, at rest.

	We used several different brands, and various
installation methods, ranging from elaborate and specialized to
a piece of ABS sewrer pipe with a push-fit cap which held the
transducer.  I have yet to hear of any problems from any of the
dealers or owners.

Geoff Walton
NCR E&M San Diego
{wherever}!ucbvax!sdcsvax!ncr-sd!geoff
Even the smallest problem becomes unsolvable if enough meetings
are hel to discuss it.

> 
>       Steve Shelley asked about an inside mounted transducer for a depth
> sounder in a previous article:
> 
>      Steve, I have seen advertisements in several boating catalogs for a
> small clear plastic dome with a lip around the edge which gets screwed
> and/or glued down to the inside of your hull.e

My Bayliner has a small transducer which just seems to be epoxied to
the inside of the hull. The brand name is US Marine.
It works fine.
-- 
Mike Taylor                        ...!{ihnp4,hplabs,amd,sun}!amdahl!mat

[ This may not reflect my opinion, let alone anyone else's.  ]