<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">The unit in mounted to the FRP cowling around my aft MBT. As such water completely surrounds the transducer and I bring the wiring through the hull with a Subcon bulkhead penetrator. Only affect of pressure is to compress the potted transducer. The transducer does not penetrate the pressure hull.<div><br></div><div>Cliff<br><br><div id="AppleMailSignature">Sent from my iPhone</div><div><br>On May 24, 2018, at 3:32 PM, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><div>Cliff,</div><div id="AppleMailSignature">if you are mounting it as a through hull; from a safety point the weak </div><div id="AppleMailSignature">link looks to be the plastic flange at the bottom that will take all the pressure. </div><div id="AppleMailSignature">I see there was a more expensive stainless unit.</div><div id="AppleMailSignature">I guess if there was any doubt you could measure the thickness of the flange</div><div id="AppleMailSignature">& calculate what pressure it would take before it sheared. I believe with plastics</div><div id="AppleMailSignature">there is a 4x safety factor where human life is concerned, so it would need to</div><div id="AppleMailSignature">take 600lb pressure. ( good project for your students lol)</div><div id="AppleMailSignature">Cheers Alan<br><br>Sent from my iPad</div><div><br>On 25/05/2018, at 7:42 AM, Cliff Redus via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr"><div>The Airmar DST800 transduce unit is hard plastic and built like a tank. There is a replaceable paddle wheel but no seals,. Everything is potted. I have had this transducer to 160 feet with no issues. The units is designed for boats as such the low depth number. Next month I will be diving the boat to 400 ft so will let you know if the transducer holds up. The 230 depth rating I was mentioning has to do with the sounder functionality. After the unmanned dive to 400 ft I plan on diving manned to 300 ft to set max operating depth of the boat. I will be able to tell you more after that dive as to what depth the unit stops sending the altitudes signals.</div><div><br></div><div>Cliff</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, May 24, 2018 at 12:53 PM, Alan via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div>Cliff,</div><div id="m_2520879766116307416AppleMailSignature">just had a look at the Airmar link & it says depth rating 10 ft. ??</div><div id="m_2520879766116307416AppleMailSignature">How are you mounting it?</div><div id="m_2520879766116307416AppleMailSignature">I am intending using Canbus in my system. </div><div id="m_2520879766116307416AppleMailSignature">Am using raspberry pi, a plc & extracting data from my motor </div><div id="m_2520879766116307416AppleMailSignature">controllers with Arduino.</div><div id="m_2520879766116307416AppleMailSignature">Cheers Alan</div><div id="m_2520879766116307416AppleMailSignature"><br><br>Sent from my iPad</div><div><br>On 25/05/2018, at 4:33 AM, Cliff Redus via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr"><div>I use an Airmar DST800 <a href="http://www.airmar.com/uploads/Brochures/dst800.pdf" target="_blank">http://www.airmar.com/uploads<wbr>/Brochures/dst800.pdf</a> for altitude and speed on the R300. Cost about $230. It also give water tempertarure. It would be compatible with what you have done as it sends results via serical communciaiton using NMEA 0183 prototcal. The unit sends a series of ASCII strings for depth, speed and temperature that you would have to capture and parse to use. I do this in my PLC. The only down side I see for your boat is the depth spec which is about 230 ft. I have seen a number of sounders that use NMEA 0183 serial or NEMA 2000 communication for sending altitude.<br><br></div><div>Some how Jon, I don't think I would find you sitting on the bottom at night on a 45 degree pitch, inebriated, and calling for a lift bag! But I do agree we can find all kinds of good reasons to add new stuff to our boats!</div><div><br></div><div>Cliff</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, May 24, 2018 at 10:55 AM, Jon Wallace via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid"><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 id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_62009"><span></span></div><div class="m_2520879766116307416m_-972095018863525399qtdSeparateBR" id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_62013">Cliff,</div><div class="m_2520879766116307416m_-972095018863525399qtdSeparateBR" id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_62013"><br></div><div class="m_2520879766116307416m_-972095018863525399qtdSeparateBR" id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_62013" dir="ltr">I will probably add altitude as soon as I can find a sensor that will interact with the Raspberry. Also not shown is air tank pressure which will be added.</div><div class="m_2520879766116307416m_-972095018863525399qtdSeparateBR" id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_62013" dir="ltr"><br></div><div class="m_2520879766116307416m_-972095018863525399qtdSeparateBR" id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_62013" dir="ltr">I agree that not all data is as important as others. Regarding the pitch and roll, I agree with your assessment on that as well. The pitch and roll outputs are "free", calculated as part of the digital compass heading which is tilt compensated, so I added them in even though they are not very useful in this particular submarine application. However, should I find myself in a night dive, stranded on the bottom, with the rear ballast tank blown off the stern, drunk, incoherent, and unable to ascertain spatial awareness; the data will come in handy so I can inform surface support that I am sitting on the bottom pitched up 45 degrees and need a lift bag attached to the stern. :) See...we can justify anything.</div><div class="m_2520879766116307416m_-972095018863525399qtdSeparateBR" id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_62013" dir="ltr"><br></div><div class="m_2520879766116307416m_-972095018863525399qtdSeparateBR" id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_62013" dir="ltr"><br><br></div><div class="m_2520879766116307416m_-972095018863525399yahoo_quoted" id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_62017" style="display:block"> <div id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_62016" style="font-family:times new roman,new york,times,serif;font-size:16px"> <div id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_62015" style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px"> <div id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_62014" dir="ltr"> <font id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_62018" face="Arial" size="2"> <hr size="1" id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_62020"> <b id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_63495"><span id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_63494" style="font-weight:bold">From:</span></b> Cliff Redus via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.o<wbr>rg</a>><br> <b id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_63493"><span id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_63492" style="font-weight:bold">To:</span></b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.o<wbr>rg</a>> <br> <b><span style="font-weight:bold">Sent:</span></b> Thursday, May 24, 2018 11:15 AM<br> <b><span style="font-weight:bold">Subject:</span></b> Re: [PSUBS-MAILIST] DSV Aquatic update<br> </font> </div> <div class="m_2520879766116307416m_-972095018863525399y_msg_container" id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_63172"><br><div id="m_2520879766116307416m_-972095018863525399yiv6185281776"><div id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_63171"><div id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_63189" dir="ltr"><div>I see depth on your navigation HMI but not altitude. Are you planning on adding this sensor? Having run my boat for several years, I find that all data is not equally important. What I find I check a lot are SOF of air tanks, SOC of batteries, depth, altitude, O2 and CO2 levels, and compass heading. Other parameters I check less frequently. Also you use an aircraft roll, pitch and compass heading style indictor which looks very nice. Having said that, my experience is that K boats have a large spread between CB and CG. As such my guess is that your indicator will not show much variation in pitch or roll under normal operating conditions but of course your heading will be active. </div><div><br clear="none"></div><div id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_63190">Keep updates coming. I enjoyed video. Would be nice to have voice over as you walk through buttons and screens on HMI.</div><div id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_63188"><br clear="none"></div><div>Best Regards</div><div><br clear="none"></div><div>Cliff</div></div><div class="m_2520879766116307416m_-972095018863525399yiv6185281776gmail_extra" id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_63170"><br clear="none"><div class="m_2520879766116307416m_-972095018863525399yiv6185281776gmail_quote" id="m_2520879766116307416m_-972095018863525399yui_3_16_0_1_1527166872160_63169"><br></div></div></div></div></div> </div> </div> </div></div></div><br>______________________________<wbr>_________________<br>
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