<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><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 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><div>Sent from my iPad</div></div><div><br>On 9/01/2017, at 5:19 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_1483892094963_2861">Hi all,</div><div id="yui_3_16_0_ym19_1_1483892094963_2861" dir="ltr">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 id="yui_3_16_0_ym19_1_1483892094963_2861" dir="ltr">Hank</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>