[PSUBS-MAILIST] transducer

[Alan via Personal_Submersibles]

Hank,
I would mix some chopped glass fibres in with it to give it a 
bit more strength. Also watch out with those thick sections
of casting resins. If they set too quickly they can be brittle 
or crack. 
Mind you with your Canadian temperatures nothing is going
to set too quickly!
Alan

Sent from my iPad

> On 9/01/2017, at 9:36 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> Thanks for the input, I think I will reinforce the transducer like you said but I will submerge it in high strength casting resin.
> Hank
> 
> 
> On Sunday, January 8, 2017 12:54 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> 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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