[PSUBS-MAILIST] transducer

[Alan via Personal_Submersibles]

Hank,
if you are going to 3000ft & went with my "shoot through hull" idea, it may pay to weld
a short tube with a bolt on cap around the fibreglass disk as a safety
back up, with the transducer inside this. If you got your calculations wrong 
& the disk burst it wouldn't be nice.  You could epoxy the transducer inside
this tube.
Alan 

Sent from my iPad

> On 9/01/2017, at 7:56 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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