<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Hank,</div>there are Shoot through hull transducers that you mount inside a boat,<div>& they can shoot through 1/2" fibreglass, maybe up to an inch.</div><div>There should be no air bubbles or gaps between the transducer & the hull.</div><div>I just looked at a 6" ID & 1/2" thick sphere in the Under Pressure program & it</div><div>says 5,600ft crush depth for epoxy fibreglass. Of course depends a lot on</div><div>a perfect layup, but encouraging results. </div><div>If you put the transducer in a 6" sphere of fibreglass & filled around the </div><div>transducer, inside, with resin or maybe chopped strands in resin, then it would </div><div>be even stronger. You could mould the sphere in 2 halves, mount the transducer</div><div>in one hemisphere, then glue the second on & fill with resin through the</div><div>cable hole.</div><div>You can test this out by going on the lake & putting your transducer in the water</div><div>against a piece of fibreglass of the thickness & material you think you'll use,</div><div>& see what depth it shows with & without the fibreglass up against it.</div><div>If you had reasonable results at 1" thick another option may be mounting the</div><div>transducer inside the hull & shooting through a small fibreglass viewport.</div><div>( my original untried idea )</div><div>Cheers Alan </div><div><br></div><div><br><div><br><div>Sent from my iPad</div></div><div><br>On 19/07/2018, at 10:18 AM, hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div>Hi all,</div><div>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. </div><div>Alan, were you working on this idea?</div><div>Hank</div><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"></div></div></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote></div></body></html>