<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>The Tahoe benchmark from 2009 tested a couple of scooters with similar prop and shroud as the one I'm using. Bollard pull was around 35-46 lbs with power consumption in the range of 450W-520W. The motor I'm using peaks at around 700W so I think I will get a slightly higher thrust. The report can be read here: <a href="http://www.tahoebenchmark.com/pdfs/2009/2009TahoeBenchmarkV2.pdf">http://www.tahoebenchmark.com/pdfs/2009/2009TahoeBenchmarkV2.pdf</a></div><div><br></div><div>- Jon</div><div><br>Den 23. jan. 2014 kl. 23:07 skrev <a href="mailto:vbra676539@aol.com">vbra676539@aol.com</a>:<br><br></div><blockquote type="cite"><div><font color="black" size="3" face="Arial, Helvetica, sans-serif"><font class="Apple-style-span" size="3">Thanks Jon. It looks to me that this could be a good alternative for the home builder. Any idea of the bollard pull your unit will produce? Even at Norwegian prices, I think you could probably build something like I'm thinking about for a thousand dollars--or 6000 kroner, whichever comes first.</font>
<div><font class="Apple-style-span" size="3">Vance<br>
</font><br>
<br>

<div style="font-family: helvetica, arial; font-size: 10pt; color: black; ">-----Original Message-----<br>
From: Jon Eide Pettersen <<a href="mailto:jon@pettersen-prod.com">jon@pettersen-prod.com</a>><br>
To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
Sent: Thu, Jan 23, 2014 4:24 pm<br>
Subject: Re: [PSUBS-MAILIST] Diver propulsion vehicle project<br>
<br>




<div id="AOLMsgPart_2_44a47d38-8e12-4427-9c55-9117b173f372">

  
    
  
  
<div class="aolReplacedBody" text="#000000" bgcolor="#FFFFFF">
    Vance,<br>

    The motor and controller was 244$ including shipping, duct and
    shroud was around 200$ including shipping and import fee. Magnets,
    bearings and sensors were around 100$ in total I think. Batteries
    will be around 125$, and I spent 80$ on delrin. The tube which is
    the main body was kindly donated from a business that liked my
    project, and the aluminium stock I was lucky have left over from a
    previous project. Keep in mind that Norway is quite expensive so
    some of the parts are propably cheaper elsewhere. Anyway, I think a
    total of 750$ sounds right.<br>

    <br>

    The motor is probably intented for some kind of industrial use, as
    it is very heavy and thick-walled. Here is a thread from
    endless-sphere with some pics and testing of the 800w edition:
<a class="moz-txt-link-freetext" target="_blank" href="http://endless-sphere.com/forums/viewtopic.php?f=30&t=45443&sid=c3f78cf1221ba9251d90820d229764e1">http://endless-sphere.com/forums/viewtopic.php?f=30&t=45443&sid=c3f78cf1221ba9251d90820d229764e1</a><br>

    <br>

    - Jon<br>

    <br>

    <br>

    
<div class="moz-cite-prefix">Den 23.01.2014 20:10, skrev
      <a class="moz-txt-link-abbreviated" href="mailto:vbra676539@aol.com">vbra676539@aol.com</a>:<br>

    </div>

    <blockquote type="cite"><font color="black" face="Arial, Helvetica,         sans-serif" size="3"><font class="Apple-style-span" size="3">Jon,</font>
        
<div><font class="Apple-style-span" size="3">Might as well ask.
            What's your total investment going to be? This looks like a
            pretty good experimental option for subs, at the very least.
            I'm with you on the motors. It will be interesting to see
            just how tough they are.</font></div>

        
<div><font class="Apple-style-span" size="3">Vance<br>

          </font><br>

          <br>

          
<div style="font-family: helvetica, arial; font-size: 10pt;             color: black; ">-----Original Message-----<br>

            From: Jon Eide Pettersen <a class="moz-txt-link-rfc2396E" href="mailto:jon@pettersen-prod.com"><jon@pettersen-prod.com></a><br>

            To: Personal Submersibles General Discussion
            <a class="moz-txt-link-rfc2396E" href="mailto:personal_submersibles@psubs.org"><personal_submersibles@psubs.org></a><br>

            Sent: Thu, Jan 23, 2014 1:24 pm<br>

            Subject: Re: [PSUBS-MAILIST] Diver propulsion vehicle
            project<br>

            <br>

            
<div id="AOLMsgPart_2_d94ed849-b2bb-4ba0-a7bc-563793e7f517">
              
<div class="aolReplacedBody" text="#000000" bgcolor="#FFFFFF"> Thanks for the kind words!<br>

                <br>

                The nozzle/shroud has an inside diameter of around 303mm
                at the narrowest. Both the nozzle and the prop are
                replacement parts for the commercial DPVs made by
                dive-xtras. The shroud cost 70.50$, while the propeller
                kit is 67$. I bought it directly from dive-x here: <a class="moz-txt-link-freetext" target="_blank" href="http://www.dive-xtras.com/cart/pc/viewPrd.asp?idproduct=42&idcategory=7">http://www.dive-xtras.com/cart/pc/viewPrd.asp?idproduct=42&idcategory=7</a>.
                <br>

                <br>

                A nice feature with the propeller is that it has
                variable pitch, and that the blades can be replaced
                individually. However, the blades are plastic and I'm
                not sure how well they would survive an impact or
                entanglement. The scooters from dive-x have a clutch to
                save the prop in case this happens. Here is a drawing of
                the propeller assembly used by dive-x:
                <a class="moz-txt-link-freetext" target="_blank" href="http://www.dive-xtras.com/pages/support/diagrams/linedrawings/propellerassembly.pdf">http://www.dive-xtras.com/pages/support/diagrams/linedrawings/propellerassembly.pdf</a><br>

                <br>

                I bought the motor from <a class="moz-txt-link-abbreviated" target="_blank" href="http://www.goldenmotor.com">www.goldenmotor.com</a>.
                I'm not impressed by the build quality, but it was very
                cheap and hopefully it will work. They also have 650w
                and 800w editions of the same motor, perhaps this would
                be suitable for use in a submersible?
                <a class="moz-txt-link-freetext" target="_blank" href="http://www.goldenmotor.com/BLDC%20Motors%20for%20Light%20Weight%20Trikes.jpg">http://www.goldenmotor.com/BLDC%20Motors%20for%20Light%20Weight%20Trikes.jpg</a><br>

                <br>

                <br>

                - Jon<br>

                <br>

                <br>

                
<div class="moz-cite-prefix">Den 23.01.2014 16:16, skrev
                  <a class="moz-txt-link-abbreviated" href="mailto:vbra676539@aol.com">vbra676539@aol.com</a>:<br>

                </div>

                <blockquote type="cite"><font color="black" face="Arial,                     Helvetica, sans-serif" size="3"><font class="Apple-style-span" size="3">And barring
                      that, how about a 36 volt 3/4 hp PM motor, housing
                      and drive? It would be sweet to cook something DIY
                      up that could be built by a competent home
                      machinist.</font>
                    
<div><font class="Apple-style-span" size="3">Vance<br>

                      </font><br>

                      <br>

                      
<div style="font-family: helvetica, arial;                         font-size: 10pt; color: black; ">-----Original
                        Message-----<br>

                        From: Alec Smyth <a class="moz-txt-link-rfc2396E" href="mailto:alecsmyth@gmail.com"><alecsmyth@gmail.com></a><br>

                        To: Personal Submersibles General Discussion <a class="moz-txt-link-rfc2396E" href="mailto:personal_submersibles@psubs.org"><personal_submersibles@psubs.org></a><br>

                        Sent: Thu, Jan 23, 2014 9:10 am<br>

                        Subject: Re: [PSUBS-MAILIST] Diver propulsion
                        vehicle project<br>

                        <br>

                        
<div id="AOLMsgPart_2_8eddab62-5290-4a0d-9150-b35c6f499f9d">
                          
<div dir="ltr">Hi Jon,
                            
<div><br>

                            </div>

                            
<div>Welcome! That is a nicely documented
                              project, and very timely since we recently
                              had threads about kort nozzles and
                              magnetic couplers. Quick question... could
                              you tell me what diameter that nozzle (aka
                              shroud) is and how much it and the prop
                              cost? I'm curious about adapting those to
                              trolling motors.</div>

                            
<div><br>

                            </div>

                            
<div><br>

                            </div>

                            
<div>Best,</div>

                            
<div><br>

                              Alec</div>

                          </div>

                          
<div class="gmail_extra"><br>

                            <br>

                            
<div class="gmail_quote">On Thu, Jan 23,
                              2014 at 8:47 AM, Jon Eide Pettersen <span dir="ltr"><<a href="mailto:jon@pettersen-prod.com">jon@pettersen-prod.com</a>></span>
                              wrote:<br>

                              <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px                                 #ccc solid;padding-left:1ex">Hi!<br>

                                <br>

                                I'm currently designing and building a
                                diver propulsion vehicle with a
                                magnetically coupled drive. I will use a
                                48v 500w BLDC motor intended for
                                electric trikes, powered by 4 SLA
                                batteries coupled in series.<br>

                                <br>

                                I'm posting my progress at my personal
                                website, <a target="_blank" href="http://pettersen-prod.com/project/dpv/index.html">http://pettersen-prod.com/project/dpv/index.html</a>.
                                <br>

                                <br>

                                Anyway, hope you find this interesting!
                                I hope to build a submersible in the
                                future, but this will suffice until I
                                have the funding and knowledge needed :)<br>

                                <br>

                                <br>

                                Regards, <br>

                                Jon Eide Pettersen<br>

_______________________________________________<br>

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                                <a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br>

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                                <br>

                              </blockquote>
                            </div>

                            <br>

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