<DIV style="font-family:Arial, sans-serif; font-size:10pt;"><DIV>My transducer in my sailboat is siliconed directly to the fiberglass. When in Catalina harbor I was in the free anchorage area, which is only about 8 feet of water. We had a minus tide of 1.4 when I was there, so at 3:45 in the morning I was listing about 10 degrees ! I looked at my depth sounder and it showed no blue, only various stratifications of red, orange and some other colors. But prior to that when I was just barely touching it did show a stripe of blue. So it seems to go through the fiberglass pretty well. </DIV><DIV> </DIV><DIV>Finally made it back ! was stranded with no crew to get back, finally found someone. Left at 9:30 in the evening and arrived at my harbor at 8:30 in the morning ! No headwind at night and no sunburn to deal with as well !</DIV><DIV> </DIV><DIV>BTW Hank, Thanks for the dish towels !</DIV><DIV> </DIV><DIV>Brian</DIV><DIV> </DIV><DIV><BR><BR>--- personal_submersibles@psubs.org wrote:<BR><BR>From: hank pronk via Personal_Submersibles <personal_submersibles@psubs.org><BR>To: Alan via Personal_Submersibles <personal_submersibles@psubs.org><BR>Subject: Re: [PSUBS-MAILIST] depth sonar<BR>Date: Thu, 19 Jul 2018 20:40:23 +0000 (UTC)<BR><BR></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>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><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 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><BR><DIV>Sent from my iPad</DIV></DIV><DIV><DIV><BR>On 20/07/2018, at 7:39 AM, hank pronk via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></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>That is an interesting idea, hmmmm I am going to investigate that.</DIV><DIV>Hank</DIV><DIV><BR></DIV><DIV><BR></DIV>
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On Thursday, July 19, 2018, 1:21:53 PM MDT, Alan via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:
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<DIV><DIV><DIV><DIV>Hank, all,</DIV><DIV>wonder if a laser distance sensor would work pointing down through</DIV><DIV>your viewport & additionally one straight out front for collision avoidance.</DIV><DIV>You could buy something with a 20 meter range & could set an alarm at</DIV><DIV>a certain distance.</DIV><DIV>I am not sure how this would work in murky conditions! Be easy to find</DIV><DIV>out by diving.</DIV><DIV>If the reading diminished with murkiness then perhaps have an additional</DIV><DIV>range finder pointed at an object on the sub exactly 1 metre away, & use</DIV><DIV>it's readings to continually calibrate the main laser.</DIV><DIV>There are a few people on this site that could easily do that with arduino.</DIV><DIV>Alan</DIV><DIV><BR></DIV><DIV><BR></DIV><DIV><BR><BR>Sent from my iPad</DIV><DIV><DIV><BR>On 20/07/2018, at 6:27 AM, Alan via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></DIV><BLOCKQUOTE><DIV></DIV></BLOCKQUOTE></DIV></DIV><DIV><DIV><DIV>Hank,</DIV><DIV>one trick I saw on a forum was to put the transducer in a bag</DIV><DIV>of water on the bottom of your boats fibreglass hull & check</DIV><DIV>the readings through the hull & then in the water.</DIV><DIV>This eliminates any air gap between transducer & hull.</DIV><DIV>This may be of benefit if you have a fibreglass boat!</DIV><DIV>Be interested in any test results.</DIV><DIV>Alan<BR><BR>Sent from my iPad</DIV><DIV><BR>On 19/07/2018, at 10:40 PM, hank pronk via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></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></DIV><DIV>Hank</DIV>
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On Wednesday, July 18, 2018, 8:54:28 PM MDT, Alan via Personal_Submersibles <<A 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="border-radius: 0px !important; line-height: 27px; font-weight: normal; margin-top: 5px; margin-bottom: 10px; text-shadow: none;"><FONT size="3"><SPAN>In-Hull Transducers</SPAN></FONT></H3><P style="margin: 0.5em 0px; border-radius: 0px !important; line-height: 1.5; padding-top: 0px;"><SPAN>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></DIV><P style="margin: 0.5em 0px; border-radius: 0px !important; line-height: 1.5; padding-top: 0px;"><SPAN>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></DIV><P style="margin: 0.5em 0px; border-radius: 0px !important; line-height: 1.5; padding-top: 0px;"><SPAN>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></DIV><P style="margin: 0.5em 0px; border-radius: 0px !important; line-height: 1.5; padding-top: 0px;"><SPAN>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><DIV style="border-radius: 0px !important; width: 250.4px; padding-right: 15px; padding-left: 15px; float: left; position: relative; min-height: 1px;"><P style="margin: 0.5em 0px; border-radius: 0px !important; line-height: 1.5; padding-top: 0px;"><SPAN style="border-radius: 0px !important; font-weight: 700;">Advantages</SPAN></P></DIV><UL style="border-radius: 0px !important; margin-top: 0px; margin-bottom: 10px;"><LI style="border-radius: 0px !important;"><SPAN>No holes drilled in hull</SPAN></LI><LI style="border-radius: 0px !important;"><SPAN>Excellent high speed performance</SPAN></LI><LI style="border-radius: 0px !important;"><SPAN>No obstructions in the water</SPAN></LI><LI style="border-radius: 0px !important;"><SPAN>Low maintenance</SPAN></LI></UL></DIV><DIV style="border-radius: 0px !important; width: 250.4px; padding-right: 15px; padding-left: 15px; float: left; position: relative; min-height: 1px;"><P style="margin: 0.5em 0px; border-radius: 0px !important; line-height: 1.5; padding-top: 0px;"><SPAN style="border-radius: 0px !important; font-weight: 700;">Disadvantages</SPAN></P></DIV><UL style="border-radius: 0px !important; margin-top: 0px; margin-bottom: 10px;"><LI style="border-radius: 0px !important;"><SPAN>Reduced maximuum depth reading</SPAN></LI><LI style="border-radius: 0px !important;"><SPAN>Reduced fish detection</SPAN></LI><LI style="border-radius: 0px !important;"><SPAN>Can only be used with fibreglass hulls</SPAN></LI></UL></DIV><BR>Sent from my iPad</DIV><DIV><DIV><BR>On 19/07/2018, at 1:52 PM, Jon Wallace via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></DIV><BLOCKQUOTE><DIV><DIV style="color: rgb(0, 0, 0); font-family: times new roman, new york, times, serif; font-size: 16px; background-color: rgb(255, 255, 255);"><DIV><SPAN><BR></SPAN></DIV><DIV><SPAN>Can it shoot through acrylic?</SPAN></DIV><DIV><BR><BR></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 face="Arial" size="2"> </FONT><HR size="1"> <B><SPAN style="font-weight: bold;">From:</SPAN></B> hank pronk via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> <B><SPAN style="font-weight: bold;">To:</SPAN></B> Personal Submersibles General Discussion <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> <BR> <B><SPAN style="font-weight: bold;">Sent:</SPAN></B> Wednesday, July 18, 2018 6:55 PM<BR> <B><SPAN style="font-weight: bold;">Subject:</SPAN></B> [PSUBS-MAILIST] depth sonar<BR> </DIV> <DIV><BR><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>Personal_Submersibles mailing list<BR><A href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A><BR><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR><BR><BR></DIV> </DIV> </DIV> </DIV></DIV></DIV></BLOCKQUOTE></DIV><BLOCKQUOTE><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><DIV>_______________________________________________<BR>Personal_Submersibles mailing list<BR><A href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A><BR><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR></DIV>
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