<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Hank,</div><div id="AppleMailSignature">I would mix some chopped glass fibres in with it to give it a </div><div id="AppleMailSignature">bit more strength. Also watch out with those thick sections</div><div id="AppleMailSignature">of casting resins. If they set too quickly they can be brittle </div><div id="AppleMailSignature">or crack. </div><div id="AppleMailSignature">Mind you with your Canadian temperatures nothing is going</div><div id="AppleMailSignature">to set too quickly!</div><div id="AppleMailSignature">Alan<br><br>Sent from my iPad</div><div><br>On 9/01/2017, at 9:36 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="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div id="yui_3_16_0_ym19_1_1483907512234_5123"><span>Alan,</span></div><div id="yui_3_16_0_ym19_1_1483907512234_5122"><span id="yui_3_16_0_ym19_1_1483907512234_5121">Thanks for the input, I think I will reinforce the transducer like you said but I will submerge it in high strength casting resin.</span></div><div id="yui_3_16_0_ym19_1_1483907512234_5120"><span>Hank</span></div> <div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font size="2" face="Arial"> On Sunday, January 8, 2017 12:54 PM, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br></font></div> <br><br> <div class="y_msg_container"><div id="yiv3790705431"><div><div>Hank,</div><div id="yiv3790705431AppleMailSignature">if you are going to 3000ft & went with my "shoot through hull" idea, it may pay to weld</div><div id="yiv3790705431AppleMailSignature">a short tube with a bolt on cap around the fibreglass disk as a safety</div><div id="yiv3790705431AppleMailSignature">back up, with the transducer inside this. If you got your calculations wrong </div><div id="yiv3790705431AppleMailSignature">& the disk burst it wouldn't be nice. You could epoxy the transducer inside</div><div id="yiv3790705431AppleMailSignature">this tube.</div><div id="yiv3790705431AppleMailSignature">Alan <br clear="none"><br clear="none">Sent from my iPad</div><div class="yiv3790705431yqt1372056819" id="yiv3790705431yqt21272"><div><br clear="none">On 9/01/2017, at 7:56 AM, Alan via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div></div></blockquote></div></div><div><div class="yiv3790705431yqt1372056819" id="yiv3790705431yqt98205"><div>Hi Hank,</div><div>Doug was building a tow behind rov with scanning sonar to 3000ft.</div><div>You may find some information there.</div><div><a rel="nofollow" shape="rect" target="_blank" href="http://www.submarineboat.com/rov_sonar.htm">http://www.submarineboat.com/rov_sonar.htm</a></div><div> I think Scott had some information on depth capability of one of his</div><div>transducers, but not sure where in the World he is!</div><div> I contacted a Navico tech rep asking about the Simrad forward scan</div><div>depth rating, & there was no testing done on this.</div><div> The good news is that most depth sounders can shoot through up</div><div>to 1/2" of fibreglass. I am not sure whether it matters if it is epoxy / glass</div><div>or polyester / glass. Would certainly be the latter as most boats are made </div><div>of it.</div><div> There is plenty of information on "Shoot through hull installation" on the net.</div><div> You could possibly encapsulate the transducer in a fibreglass ball, making</div><div>sure there is no more than 1/2" thickness in the transmitting area. As most</div><div>boats have a hull thats angled to the surface of the water, I don't think it would </div><div>matter having a rounded fibreglass form around the transducer.</div><div> It is important that there are no air gaps or bubbles in the transmitting area.</div><div> One idea I had was to make a miniature view port with a 1/2 inch thick fibreglass</div><div>disk in it, & mount the transducer in the hull over that. This would mean no </div><div>pressure & water proofing or through hulls. I think a 2" x 1/2" disc would do for about 4000ft.</div><div>Alan</div><div><br clear="none"><div>Sent from my iPad</div></div><div><br clear="none">On 9/01/2017, at 5:19 AM, hank pronk via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div><div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;"><div id="yiv3790705431yui_3_16_0_ym19_1_1483892094963_2861">Hi all,</div><div dir="ltr" id="yiv3790705431yui_3_16_0_ym19_1_1483892094963_2861">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. </div><div dir="ltr" id="yiv3790705431yui_3_16_0_ym19_1_1483892094963_2861">Hank</div></div></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br clear="none"><span>Personal_Submersibles mailing list</span><br clear="none"><span><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br clear="none"><span><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br clear="none"></div></blockquote></div><blockquote type="cite"><div><span>_______________________________________________</span><br clear="none"><span>Personal_Submersibles mailing list</span><br clear="none"><span><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br clear="none"><span><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br clear="none"></div></blockquote></div></div><br><div class="yqt1372056819" id="yqt28191">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br><br></div> </div> </div> </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></body></html>