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<div>Brian , the original Nekton subs dragged a garden hose full of lead pellets to stay at their desired depth. A weight would work for shock absorption, but I want to know how far from bottom I am to avoid hitting something bad, plus a weight could get stuck in something. E 3000 is going to be extremely tangle proof including a jettisoning occupant sphere.</div><div>Hank</div><div><br></div>
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On Tuesday, July 24, 2018, 5:50:29 PM MDT, Brian Cox via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div><div id="yiv3297925038"><div><div style="font-family:Arial, sans-serif;font-size:10pt;"><font size="2" style=""><font face="Arial, sans-serif">Might be nice to have a weight hanging below to act as a shock absorber when landing.</font></font><div><font face="Arial, sans-serif" size="2"><br clear="none"></font></div><div><font face="Arial, sans-serif" size="2">Brian</font></div><div><font face="Arial, sans-serif" size="2"><br clear="none"></font></div><div><font face="Arial, sans-serif" size="2"><br clear="none"></font><br clear="none"><span style="font-family:Arial, sans-serif;font-size:10pt;">--- personal_submersibles@psubs.org wrote:</span><br clear="none"><br clear="none"><span style="font-family:Arial, sans-serif;font-size:10pt;">From: hank pronk via Personal_Submersibles <personal_submersibles@psubs.org></span><br clear="none"><span style="font-family:Arial, sans-serif;font-size:10pt;">To: via Personal_Submersibles <personal_submersibles@psubs.org></span><br clear="none"><span style="font-family:Arial, sans-serif;font-size:10pt;">Subject: Re: [PSUBS-MAILIST] depth sonar</span><br clear="none"><span style="font-family:Arial, sans-serif;font-size:10pt;">Date: Thu, 19 Jul 2018 11:54:13 +0000 (UTC)</span><br clear="none"><br clear="none"><div class="yiv3297925038yqt6776564215" id="yiv3297925038yqt83259"><div style=""><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div></div>
<div>Cliff,</div><div>No I have a 1000 foot sounder, but I am not worried about the depth below the sub when I am on the surface. I need to know when I am going to reach the bottom. With low visibility I can't see the bottom and rely heavily on the sounder. I have also observed a 5% inaccuracy in sounders when measuring against a rope. </div><div>Hank</div><div><br clear="none"></div>
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On Thursday, July 19, 2018, 5:30:24 AM MDT, via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div><div><div><div>Do you have a sounder transponder speced that will reach 3000 ft? </div><div><br clear="none"></div><div>Cliff</div><div><div><br clear="none">On Jul 19, 2018, at 5:40 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><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><div><div>Jon, Hank,</div><div>here's a bit of info pasted below.</div><div>I am not sure about acrylic. You would have to attach the transducer to</div><div>the acrylic unless you put the transducer in a bag full of water & had this</div><div>forced against the acrylic. </div><div>Again someone could try hanging the transducer in water while pushing it </div><div>against a piece of acrylic.</div><div>Alan</div><div><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 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 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><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><div><div style="color:#000;background-color:#fff;font-family:times new roman, new york, times, serif;font-size:16px;"><div><span><br clear="none"></span></div><div><span>Can it shoot through acrylic?</span></div><div><br clear="none"><br clear="none"></div><div style="display:block;"> <div style="font-family:times new roman, new york, times, serif;font-size:16px;"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div dir="ltr"> <font 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><span 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><br clear="none"><div><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></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" 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><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>_______________________________________________<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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