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From: geoff@ncr-sd.UUCP (Geoffrey Walton)
Newsgroups: net.rec.boat
Subject: Re: In-Hull Transducers
Message-ID: <317@ncr-sd.UUCP>
Date: Thu, 31-Oct-85 12:39:52 EST
Article-I.D.: ncr-sd.317
Posted: Thu Oct 31 12:39:52 1985
Date-Received: Sun, 3-Nov-85 15:04:17 EST
References: <139@biomed.UUCP>
Organization: NCR Corporation, Torrey Pines
Lines: 33

> 
>       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.