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<div>Alan,</div><div>Intersting, but I just examined the transducer and it is potted solid. I think it is possible to send one to 3000 feet. I will pressure test one to 3000 feet before I get too involved in an alternative solution. Stay tuned......</div><div>Hank</div><div><br></div>
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On Thursday, July 19, 2018, 2:17:29 PM MDT, Alan via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div><div id="yiv8646272274"><div><div>Hank,</div><div>did a bit more googling & blue laser is the way to go.</div><div>Here's an article.</div><div><a rel="nofollow" shape="rect" target="_blank" href="https://electronics.stackexchange.com/questions/55804/underwater-distance-measurement-sensing">https://electronics.stackexchange.com/questions/55804/underwater-distance-measurement-sensing</a></div><div>Deep sea power & light put out a dual laser beam device but nit for</div><div>measurement.</div><div>Alan<br clear="none"><br clear="none"><div>Sent from my iPad</div></div><div class="yiv8646272274yqt4511335707" id="yiv8646272274yqt70114"><div><br clear="none">On 20/07/2018, at 7:39 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="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div></div>
<div>Alan,</div><div>That is an interesting idea, hmmmm I am going to investigate that.</div><div>Hank</div><div><br clear="none"></div><div><br clear="none"></div>
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On Thursday, July 19, 2018, 1:21:53 PM MDT, 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:
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<div><div id="yiv8646272274"><div><div>Hank, all,</div><div id="yiv8646272274AppleMailSignature">wonder if a laser distance sensor would work pointing down through</div><div id="yiv8646272274AppleMailSignature">your viewport & additionally one straight out front for collision avoidance.</div><div id="yiv8646272274AppleMailSignature">You could buy something with a 20 meter range & could set an alarm at</div><div id="yiv8646272274AppleMailSignature">a certain distance.</div><div id="yiv8646272274AppleMailSignature">I am not sure how this would work in murky conditions! Be easy to find</div><div id="yiv8646272274AppleMailSignature">out by diving.</div><div id="yiv8646272274AppleMailSignature">If the reading diminished with murkiness then perhaps have an additional</div><div id="yiv8646272274AppleMailSignature">range finder pointed at an object on the sub exactly 1 metre away, & use</div><div id="yiv8646272274AppleMailSignature">it's readings to continually calibrate the main laser.</div><div id="yiv8646272274AppleMailSignature">There are a few people on this site that could easily do that with arduino.</div><div id="yiv8646272274AppleMailSignature">Alan</div><div id="yiv8646272274AppleMailSignature"><br clear="none"></div><div id="yiv8646272274AppleMailSignature"><br clear="none"></div><div id="yiv8646272274AppleMailSignature"><br clear="none"><br clear="none">Sent from my iPad</div><div class="yiv8646272274yqt0698113814" id="yiv8646272274yqt10665"><div><br clear="none">On 20/07/2018, at 6:27 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="yiv8646272274yqt0698113814" id="yiv8646272274yqt45608"><div>Hank,</div><div id="yiv8646272274AppleMailSignature">one trick I saw on a forum was to put the transducer in a bag</div><div id="yiv8646272274AppleMailSignature">of water on the bottom of your boats fibreglass hull & check</div><div id="yiv8646272274AppleMailSignature">the readings through the hull & then in the water.</div><div id="yiv8646272274AppleMailSignature">This eliminates any air gap between transducer & hull.</div><div id="yiv8646272274AppleMailSignature">This may be of benefit if you have a fibreglass boat!</div><div id="yiv8646272274AppleMailSignature">Be interested in any test results.</div><div id="yiv8646272274AppleMailSignature">Alan<br clear="none"><br clear="none">Sent from my iPad</div><div><br clear="none">On 19/07/2018, at 10:40 PM, 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="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div></div>
<div>Alan,</div><div>Thanks' for the input, I like the sphere idea. That could be made pretty easily.</div><div>Jon, I was wondering the same thing, so I read a bunch of comments about transducer mounting. There seems to be a lot of disagreement about what can work in terms of material. I will have to test it out with acrylic for myself. According to the acrylic calculator I can get away with 1\2 inch acrylic if it is 2 in dia. I could make a housing with a acrylic bottom and even fill the housing with epoxy. </div><div><br clear="none"></div><div>Hank</div>
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On Wednesday, July 18, 2018, 8:54:28 PM MDT, 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:
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<div><div id="yiv8646272274"><div><div>Jon, Hank,</div><div id="yiv8646272274AppleMailSignature">here's a bit of info pasted below.</div><div id="yiv8646272274AppleMailSignature">I am not sure about acrylic. You would have to attach the transducer to</div><div id="yiv8646272274AppleMailSignature">the acrylic unless you put the transducer in a bag full of water & had this</div><div id="yiv8646272274AppleMailSignature">forced against the acrylic. </div><div id="yiv8646272274AppleMailSignature">Again someone could try hanging the transducer in water while pushing it </div><div id="yiv8646272274AppleMailSignature">against a piece of acrylic.</div><div id="yiv8646272274AppleMailSignature">Alan</div><div id="yiv8646272274AppleMailSignature"><h3 style="font-weight:normal;line-height:27px;margin-top:5px;margin-bottom:10px;text-shadow:none;border-top-left-radius:0px !important;border-top-right-radius:0px !important;border-bottom-right-radius:0px !important;border-bottom-left-radius:0px !important;"><font size="3"><span style="">In-Hull Transducers</span></font></h3><p style="margin:0.5em 0px;line-height:1.5;padding-top:0px;border-top-left-radius:0px !important;border-top-right-radius:0px !important;border-bottom-right-radius:0px !important;border-bottom-left-radius:0px !important;"><span style="">In-hull (a.k.a. shoot-through) transducers are epoxied directly to the inside of the hull. These are only used in fiberglass hulls. In-hulls will not work with wooden, aluminum, or steel hulls, or in foam sandwich/hulls that have air pockets. Any wood, metal, or foam reinforcement must be removed from the inside of the hull.</span></p><p style="margin:0.5em 0px;line-height:1.5;padding-top:0px;border-top-left-radius:0px !important;border-top-right-radius:0px !important;border-bottom-right-radius:0px !important;border-bottom-left-radius:0px !important;"><span style="">With an in-hull transducer, the signal is transmitted and received through the hull of the boat. As a result, there is considerable loss of sonar performance.</span></p><p style="margin:0.5em 0px;line-height:1.5;padding-top:0px;border-top-left-radius:0px !important;border-top-right-radius:0px !important;border-bottom-right-radius:0px !important;border-bottom-left-radius:0px !important;"><span style="">In other words, you won't be able to read as deep or detect fish as well with an in-hull transducer as with one that's transom mounted or thru-hull mounted.</span></p><p style="margin:0.5em 0px;line-height:1.5;padding-top:0px;border-top-left-radius:0px !important;border-top-right-radius:0px !important;border-bottom-right-radius:0px !important;border-bottom-left-radius:0px !important;"><span style="">Fiberglass hulls are often reinforced in places for added strength. These cored areas contain balsa wood or structural foam, which are poor sound conductors. The transducer will need to be located where the fiberglass is solid and there are no air bubbles trapped in the fiberglass resin. You'll also want to make sure that there is no coring, flotation material, or dead air space sandwiched between the inside skin and the outer skin of the hull.</span></p><div class="yiv8646272274col-sm-6" style="position:relative;min-height:1px;padding-left:15px;padding-right:15px;float:left;width:250.40625px;border-top-left-radius:0px !important;border-top-right-radius:0px !important;border-bottom-right-radius:0px !important;border-bottom-left-radius:0px !important;"><p style="margin:0.5em 0px;line-height:1.5;padding-top:0px;border-top-left-radius:0px !important;border-top-right-radius:0px !important;border-bottom-right-radius:0px !important;border-bottom-left-radius:0px !important;"><span style="font-weight:700;border-top-left-radius:0px !important;border-top-right-radius:0px !important;border-bottom-right-radius:0px !important;border-bottom-left-radius:0px !important;">Advantages</span></p><ul style="border-top-left-radius:0px !important;border-top-right-radius:0px !important;border-bottom-right-radius:0px !important;border-bottom-left-radius:0px !important;margin-top:0px;margin-bottom:10px;"><li style="border-top-left-radius:0px !important;border-top-right-radius:0px !important;border-bottom-right-radius:0px !important;border-bottom-left-radius:0px !important;"><span style="">No holes drilled in hull</span></li><li style="border-top-left-radius:0px !important;border-top-right-radius:0px !important;border-bottom-right-radius:0px !important;border-bottom-left-radius:0px !important;"><span style="">Excellent high speed performance</span></li><li style="border-top-left-radius:0px !important;border-top-right-radius:0px !important;border-bottom-right-radius:0px !important;border-bottom-left-radius:0px !important;"><span style="">No obstructions in the water</span></li><li style="border-top-left-radius:0px !important;border-top-right-radius:0px !important;border-bottom-right-radius:0px !important;border-bottom-left-radius:0px !important;"><span style="">Low maintenance</span></li></ul></div><div class="yiv8646272274col-sm-6" style="position:relative;min-height:1px;padding-left:15px;padding-right:15px;float:left;width:250.40625px;border-top-left-radius:0px !important;border-top-right-radius:0px !important;border-bottom-right-radius:0px !important;border-bottom-left-radius:0px !important;"><p style="margin:0.5em 0px;line-height:1.5;padding-top:0px;border-top-left-radius:0px !important;border-top-right-radius:0px !important;border-bottom-right-radius:0px !important;border-bottom-left-radius:0px !important;"><span style="font-weight:700;border-top-left-radius:0px !important;border-top-right-radius:0px !important;border-bottom-right-radius:0px !important;border-bottom-left-radius:0px !important;">Disadvantages</span></p><ul style="margin-top:0px;margin-bottom:10px;border-top-left-radius:0px !important;border-top-right-radius:0px !important;border-bottom-right-radius:0px !important;border-bottom-left-radius:0px !important;"><li style="border-top-left-radius:0px !important;border-top-right-radius:0px !important;border-bottom-right-radius:0px !important;border-bottom-left-radius:0px !important;"><span style="">Reduced maximuum depth reading</span></li><li style="border-top-left-radius:0px !important;border-top-right-radius:0px !important;border-bottom-right-radius:0px !important;border-bottom-left-radius:0px !important;"><span style="">Reduced fish detection</span></li><li style="border-top-left-radius:0px !important;border-top-right-radius:0px !important;border-bottom-right-radius:0px !important;border-bottom-left-radius:0px !important;"><span style="">Can only be used with fibreglass hulls</span></li></ul></div><br clear="none">Sent from my iPad</div><div class="yiv8646272274yqt5441821004" id="yiv8646272274yqt52556"><div><br clear="none">On 19/07/2018, at 1:52 PM, Jon Wallace 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:times new roman, new york, times, serif;font-size:16px;"><div id="yiv8646272274yui_3_16_0_ym19_1_1531965059710_8187"><span><br clear="none"></span></div><div id="yiv8646272274yui_3_16_0_ym19_1_1531965059710_8187"><span id="yiv8646272274yui_3_16_0_ym19_1_1531965059710_8188">Can it shoot through acrylic?</span></div><div class="yiv8646272274qtdSeparateBR" id="yiv8646272274yui_3_16_0_ym19_1_1531965059710_8159"><br clear="none"><br clear="none"></div><div class="yiv8646272274yahoo_quoted" id="yiv8646272274yui_3_16_0_ym19_1_1531965059710_8194" style="display:block;"> <div id="yiv8646272274yui_3_16_0_ym19_1_1531965059710_8193" style="font-family:times new roman, new york, times, serif;font-size:16px;"> <div id="yiv8646272274yui_3_16_0_ym19_1_1531965059710_8192" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div dir="ltr" id="yiv8646272274yui_3_16_0_ym19_1_1531965059710_8191"> <font id="yiv8646272274yui_3_16_0_ym19_1_1531965059710_8190" size="2" face="Arial"> </font><hr size="1"> <b><span style="font-weight:bold;">From:</span></b> 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>><br clear="none"> <b><span style="font-weight:bold;">To:</span></b> Personal Submersibles General Discussion <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br clear="none"> <b id="yiv8646272274yui_3_16_0_ym19_1_1531965059710_8196"><span id="yiv8646272274yui_3_16_0_ym19_1_1531965059710_8195" style="font-weight:bold;">Sent:</span></b> Wednesday, July 18, 2018 6:55 PM<br clear="none"> <b><span style="font-weight:bold;">Subject:</span></b> [PSUBS-MAILIST] depth sonar<br clear="none"> </div> <div class="yiv8646272274y_msg_container" id="yiv8646272274yui_3_16_0_ym19_1_1531965059710_8197"><br clear="none"><div id="yiv8646272274"><div id="yiv8646272274yui_3_16_0_ym19_1_1531965059710_8200"><div id="yiv8646272274yui_3_16_0_ym19_1_1531965059710_8199" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div>Hi all,</div><div id="yiv8646272274yui_3_16_0_ym19_1_1531965059710_8198">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 id="yiv8646272274yui_3_16_0_ym19_1_1531965059710_8201">Hank</div><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"></div></div></div></div>_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a rel="nofollow" shape="rect" id="yiv8646272274yui_3_16_0_ym19_1_1531965059710_8202" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"><br clear="none"><br clear="none"></div> </div> </div> </div></div></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><div class="yiv8646272274yqt5441821004" id="yiv8646272274yqt76363">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><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><br clear="none"></div></div>
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