[PSUBS-MAILIST] transducer

[Rick Patton via Personal_Submersibles]

While we are on the topic of underwater transducers and how deep they are
rated for, it brought up something else that I wanted to put out there. I
bought my OTS set up for my sub and support boat about 3 or 4 years ago and
about a year ago I called their tech support and asked them what the depth
rating was for their transducers. I believe they said that they figured
around 200' or so. Having a K-350, I figured that wouldn't work. They said
that they just came out with a newer model that was good for a lot deeper
(past the working depth of the K-350) so I bought it from a rep on Maui for
$150 or so.
OTS seems to be used by a lot of Psuber,s so has anyone out there that is
using an older model had their sub transducer fail? if so you might check
into the new model that can go deeper. Be interesting to hear from you all.
Thanks and happy new year all.

Rick

On Sun, Jan 8, 2017 at 8:56 AM, Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi Hank,
> Doug was building a tow behind rov with scanning sonar to 3000ft.
> You may find some information there.
> http://www.submarineboat.com/rov_sonar.htm
>    I think Scott had some information on depth capability of one of his
> transducers, but not sure where in the World he is!
>    I contacted a Navico tech rep asking about the Simrad forward scan
> depth rating, & there was no testing done on this.
>    The good news is that most depth sounders can shoot through up
> to 1/2" of fibreglass. I am not sure whether it matters if it is epoxy /
> glass
> or  polyester / glass. Would certainly be the latter as most boats are
> made
> of it.
>    There is plenty of information on "Shoot through hull installation" on
> the net.
>    You could possibly encapsulate the transducer in a fibreglass ball,
> making
> sure there is no more than 1/2" thickness in the transmitting area. As most
> boats have a hull thats angled to the surface of the water, I don't think
> it would
> matter having a rounded fibreglass form around the transducer.
>    It is important that there are no air gaps or bubbles in the
> transmitting area.
>    One idea I had was to make a miniature view port with a 1/2 inch thick
> fibreglass
> disk in it, & mount the transducer in the hull over that. This would mean
> no
> pressure & water proofing or through hulls. I think a 2" x 1/2" disc would
> do for about 4000ft.
> Alan
>
> Sent from my iPad
>
> On 9/01/2017, at 5:19 AM, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hi all,
> I am installing a transducer for sonar on Elementary and was planning to
> mount it inside the camera housing, but just read that it will not shoot
> through metal.  Does anyone know how deep a transducer can go unprotected?
>  do I have to build a fibreglass pressure housing for it?  I have had a
> cheap one on Gamma to just under 200 feet without trouble.
> Hank
>
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