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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Hank,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Will the four thrusters be mounted high on the hull like the single vertical one you showed me last week? If so then this position would probably be beneficial for three dimensional maneuvering close to the bottom as the thrusters would be less likely to stir up the silt and mud. Less likely doesn't mean won't. I am imagining that you will have four thrusters mounted high, horizontal and canted 45 degrees to the long axis. Toss a photo or drawing our way so that we can see your plans.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>An aircraft compass may be your best bet since you can adjust the internal magnets to "swing" the compass. It's hard to say how even that would work inside an all steel boat, especially when that big electric motor powers up. Scuba with a DPV made my wrist compass useless while under power. What are the K-subs using for compass nav?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Tim<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <b>On Behalf Of </b>hank pronk via Personal_Submersibles<br><b>Sent:</b> July-30-15 5:34 AM<br><b>To:</b> Personal Submersibles General Discussion <personal_submersibles@psubs.org><br><b>Subject:</b> Re: [PSUBS-MAILIST] thruster positioning<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div id="yui_3_16_0_1_1438258701459_4105"><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'>Tim,<o:p></o:p></span></p></div><div id="yui_3_16_0_1_1438258701459_4105"><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'>I learned a lot yesterday, I repositioned my test thrusters from strait ahead to angled almost 45 degrees. My concern was the forward speed would suffer greatly. In fact the forward speed is still very good, and the turning performance is also good. I am now thinking I will use 4 thrusters. I am not sure about the DW set up because the DW is a short wide machine compared to Gamma. I am thinking the same for the vertical thrusters, but the forward thrusters might be in the front on an angle. I will test with the thrusters in the rear before I commit. If the forward thrusters are in the front, I can see them and it is easier to make them jettisoning .<o:p></o:p></span></p></div><div id="yui_3_16_0_1_1438258701459_4105"><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'>The viz in Premier lake is still 15 feet and I am still struggling with my compass. I think I will have to go electronic because what I have is useless.<o:p></o:p></span></p></div><div id="yui_3_16_0_1_1438258701459_4105"><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'>Hank<o:p></o:p></span></p></div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'><o:p> </o:p></span></p><div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'><o:p> </o:p></span></p></div><div><div><div><div><p class=MsoNormal style='background:white'><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>On Tuesday, July 28, 2015 9:26 PM, T Novak via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:</span><span style='font-family:"Helvetica",sans-serif;color:black'><o:p></o:p></span></p></div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='font-family:"Helvetica",sans-serif;color:black'><o:p> </o:p></span></p><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica",sans-serif;color:black'>Hey Hank,<br><br>Take note of the DW configuration.<br>Four fixed reversible thrusters, two horizontal and two vertical but canted<br>out by 45 degrees.<br>The two horizontal control surge (both powered forward or in reverse) and<br>yaw (one powered forward, the other in reverse).<br>The two vertical control heave (both powered up or down) and translate (one<br>powered up, the other down).<br>There is no roll or pitch control, the ballast block (batteries and lead)<br>keep the vehicle level on those axis (slight roll during translate<br>operation).<br><br>Some ROV's have four fixed reversible horizontal thrusters, one on each<br>corner, with the front two pointed 45 degrees inward and the aft two pointed<br>45 degrees outward, and one vertical reversible thruster.<br>The four horizontal control surge (all powered forward or reverse), yaw (one<br>side forward the other side reverse), and translate (one aft thruster<br>forward, the other reverse, and one front thruster forward and the other<br>reverse).<br>The vertical thruster controls heave.<br><br>Minimum two axis control is one steerable reversible thruster to control<br>surge and yaw. Control heave with buoyancy or dive planes which really is<br>pitch control rather than true heave.<br>Minimum three axis control is two independent rotating non-reversible<br>thrusters, one on each side, to control surge, heave and yaw by the<br>direction they are pointed (the SportSub has this but they must rotate<br>together and are therefore reversible). If they are also canted out 45<br>degrees then you also get to control translate.<br><br>Pitch and roll are necessary in airplanes, but not in personal submarines<br>(okay sometimes pitch is useful for powered ascent and descent). <br><br>I think three reversible thruster do the trick, the primary in the stern<br>that is steerable for surge and yaw, and one canted reversible rotatable on<br>each side for heave, translate, surge redundancy, and yaw redundancy. Place<br>those two on the sides just forward of hydrodynamic centre and you also get<br>a bit of powered pitch.<br><br>What configuration were you thinking about with six thrusters? Eight? Are<br>you looking for redundancy or only non-reversible thrusters?<br><br>Tim<br><br>-----Original Message-----<br>From: Personal_Submersibles [mailto:<a href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-bounces@psubs.org</a>]<br>On Behalf Of hank pronk via Personal_Submersibles<br>Sent: July-28-15 1:38 PM<br>To: <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><br>Subject: [PSUBS-MAILIST] thruster positioning<br><br>I am trying to figure out the thruster position for all my thrusters before<br>I take Gamma apart. I have tested with two thruster pointing strait ahead.<br>That worked well, now I have the same two thruster on angles opposing each<br>other. I notice on some commercial subs that the thrusters are vectored,<br>in fact four forward facing thrusters, one at each corner. I assume the way<br>it works is, all four thrusters are turned on, two in forward and two in<br>reverse. To go strait ahead all four turn on in the same direction. I am<br>trying to keep it at 6 thrusters but may need 8.<br>Hank <br>_______________________________________________<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" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><o:p></o:p></span></p><div id=yqtfd36645><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica",sans-serif;color:black'><br><br>_______________________________________________<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" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><o:p></o:p></span></p></div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='font-family:"Helvetica",sans-serif;color:black'><o:p> </o:p></span></p></div></div></div></div></div></div></body></html>