[PSUBS-MAILIST] depth sonar

[Alan via Personal_Submersibles]

Hank,
there are Shoot through hull transducers that you mount inside a boat,
& they can shoot through 1/2" fibreglass, maybe up to an inch.
There should be no air bubbles or gaps between the transducer & the hull.
I just looked at a 6" ID & 1/2" thick sphere in the Under Pressure program & it
says 5,600ft crush depth for epoxy fibreglass. Of course depends a lot on
a perfect layup, but encouraging results. 
If you put the transducer in a 6" sphere of fibreglass & filled around the 
transducer, inside, with resin or maybe chopped strands in resin, then it would 
be even stronger. You could mould the sphere in 2 halves, mount the transducer
in one hemisphere, then glue the second on & fill with resin through the
cable hole.
You can test this out by going on the lake & putting your transducer in the water
against a piece of fibreglass of the thickness & material you think you'll use,
& see what depth it shows with & without the fibreglass up against it.
If you had reasonable results at 1" thick another option may be mounting the
transducer inside the hull & shooting through a small fibreglass viewport.
( my original untried idea )
Cheers Alan 



Sent from my iPad

> On 19/07/2018, at 10:18 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Hi all,
> I am looking for ideas on how to make a depth transducer survive to 3,000 feet.   I am thinking about a 1 atm housing with a fibreglass bottom that the transducer can shoot through. 
> Alan, were you working on this idea?
> Hank
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