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<div><font size="3">Joe,</font></div>
<div><font size="3">Eight 12v batteries would just yield nominal 96 volts. <font face="Arial, Helvetica, sans-serif">The configurations available change when you're connecting lithium batteries, so I'm not sure how they're getting the high DC voltages. </font>I've wondered the same thing, but haven't yet asked those in the group who have expertise in DC systems. We commonly use inverters to convert 12v battery output to 120v AC, so using transformers seems reasonable.</font></div>
<div><font size="3">Jim </font></div>
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<div style="color: black; font-family: arial,helvetica; font-size: 10pt;">-----Original Message-----<br>
From: Joe Perkel <josephperkel@yahoo.com><br>
To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><br>
Sent: Mon, Oct 28, 2013 11:24 am<br>
Subject: Re: [PSUBS-MAILIST] Group Help Request<br>
<br>
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<div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 14pt; background-color: rgb(255, 255, 255);">
<div style="right: auto;"><span style="right: auto;">Jim,</span></div>
<div style="right: auto;"><span style="right: auto;"></span> </div>
<div style="right: auto; color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 19px; font-style: normal; background-color: transparent;"><span style="right: auto;">On attachment I can use suggestions from the group. But, I am envisioning a concentric ring surrounding the outer housing with a set screw or two. The supports come off of this ring and are supported on both ends by countersunk screws. All of this stuff made of the same ABS plastic exept the hardware.</span></div>
<div style="right: auto;"><span style="right: auto;"></span> </div>
<div style="right: auto; color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 19px; font-style: normal; background-color: transparent;"><span style="right: auto;">On the Nuytco thruster, ... 4.5 hp turning a 12.1" propeller with 7.5" pitch @ 1200 RPM will push a 6,000 lb submersible @ 4.27 kts, So,... if we can enclose a 4.5 hp motor in a #6 Sch 40 pipe and turn that prop @ 1200 rpm, we can <span id="misspell-3"><span>mimic</span></span> this thruster. The problem is feeding the input voltage.</span></div>
<div style="right: auto;"><span style="right: auto;"></span> </div>
<div style="right: auto; color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 19px; font-style: normal; background-color: transparent;"><span style="right: auto;">So my question then is, How is Curasub feeding those 200 - 400 vdc thrusters? Do 8 batteries connected in series give you 200 v? Or is there some type of step up transformer in play here? I am unclear on how this works.</span></div>
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<div style="right: auto;"><span style="right: auto;">Joe</span></div>
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<font face="Arial" size="2"><b><span style="font-weight: bold;">From:</span></b> "<a href="mailto:jimtoddpsub@aol.com">jimtoddpsub@aol.com</a>" <<a href="mailto:jimtoddpsub@aol.com">jimtoddpsub@aol.com</a>><br>
<b><span style="font-weight: bold;">To:</span></b> <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> <br>
<b><span style="font-weight: bold;">Sent:</span></b> Monday, October 28, 2013 9:39 AM<br>
<b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Group Help Request<br>
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<div><font size="3">Joe,</font></div>
<div><font size="3"></font> </div>
<div><font size="3">Another company that will give you quick quotes on printing a 3D object in a variety of materials is <a href="http://www.shapeways.com/" target="_blank" rel="nofollow" shape="rect">http://www.shapeways.com/</a>. </font></div>
<div><font size="3"></font> </div>
<div><font size="3">The Kort nozzle (the ring itself) doesn't necessarily have to be printed in one piece; it could be printed in two or three segments of the circle and joined together. What material do you plan to use for the supports, and how do you plan to attach them to the motor housing? The nozzle and the supports don't have to be of the same material, and printing the nozzle doesn't mean you have to print the supports. Lots of options to consider.</font></div>
<div><font size="3"></font> </div>
<div><font size="3">There are services around such as <a href="http://www.lazerdesign.com/" target="_blank" rel="nofollow" shape="rect">http://www.lazerdesign.com/</a> that can do a 3D scan on an existing object and save a lot of CAD work. You can also find desktop 3D scanners for sale such as <a href="http://www.makerbot.com/Digitizer" target="_blank" rel="nofollow" shape="rect">www.makerbot.com/Digitizer</a>.</font></div>
<div><font size="3"></font> </div>
<div><font size="3">Just for fun, take a look at Nuytco's MK-2 thruster: <a href="http://nuytco.com/products/nmt12-mk2-thruster/" target="_blank" rel="nofollow" shape="rect">http://nuytco.com/products/nmt12-mk2-thruster/</a></font></div>
<div><font size="3"></font> </div>
<div><font size="3">Have fun,</font></div>
<div><font size="3">Jim</font></div>
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<div style="color: black; font-family: arial, helvetica; font-size: 10pt;">-----Original Message-----<br clear="none">From: Joe Perkel <<a href="mailto:josephperkel@yahoo.com">josephperkel@yahoo.com</a>><br clear="none">To: personal_submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none">Sent: Mon, Oct 28, 2013 6:42 am<br clear="none">Subject: Re: [PSUBS-MAILIST] Group Help Request<br clear="none"><br clear="none">
<div class="yiv4745745059yqt7816582916" id="yiv4745745059yqt47597">
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<td valign="top" rowspan="1" colspan="1">I just love the world in which we live! Look what I found while waiting to take my daughter to school,.. <a href="http://www.quickparts.com/QuickQuote.aspx" target="_blank" rel="nofollow" shape="rect">http://www.quickparts.com/QuickQuote.aspx</a><br clear="none"><br clear="none">Isn't that just the coolest thing! The Star Trek synthesizer in the real world.<br clear="none"><br clear="none">Joe<br clear="none"><br clear="none">Sent from Yahoo! Mail for iPad</td></tr></tbody></table>
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<b><span style="font-weight: bold;">From:</span> </b>Marc de Piolenc <<a href="mailto:piolenc@archivale.com" rel="nofollow" shape="rect">piolenc@archivale.com</a>>; <br clear="none"><b><span style="font-weight: bold;">To:</span> </b><<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" shape="rect">personal_submersibles@psubs.org</a>>; <br clear="none"><b><span style="font-weight: bold;">Subject:</span> </b>Re: [PSUBS-MAILIST] Group Help Request <br clear="none"><b><span style="font-weight: bold;">Sent:</span> </b>Mon,
Oct 28, 2013 10:46:58 AM <br clear="none"></div>
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<td valign="top" rowspan="1" colspan="1">Never thought much about doing it at small scale.<br clear="none"><br clear="none">I suppose I would set up something like a wood lathe or a potter's wheel <br clear="none">and work in some very soft material like low-density foam. Once I had <br clear="none">the shape that I wanted, I suppose one could pour a mold around the <br clear="none">master, melt or dissolve out the pattern and cast the final part in some <br clear="none">suitable plastic, or even in aluminum if you were ambitious.<br clear="none"><br clear="none">3D printing seems like the ultimate way to do it, though - the accuracy <br clear="none">available is already better than what we would need, and if the inital <br clear="none">results are not perfect, making changes and printing out another <br clear="none">prototype is very quick.<br clear="none"><br clear="none">Marc<br clear="none"><br clear="none">On 10/28/2013 6:13 PM, Joe Perkel wrote:<br clear="none">> How can a
home builder maintain that contour 360 Deg out of "X" material?<br clear="none">><br clear="none">> Joe<br clear="none">><br clear="none">> Sent from my overpriced<br clear="none">> iPhone<br clear="none">><br clear="none">> On Oct 28, 2013, at 2:57 AM, Marc de Piolenc <<a rel="nofollow" shape="rect">piolenc@archivale.com</a>> wrote:<br clear="none">><br clear="none">>> Quick clarification: a properly contoured Kort nozzle, MARRIED TO A MATCHING PROPELLER, will increase static and low-speed thrust. Of course it won't increase power, since that comes from your motor. If you just put a shroud around your existing prop, you will be disappointed, and a shroud that doesn't do the job is overpriced unless it's free! Key ingredients for success:<br clear="none">>><br clear="none">>> Prop matched to the shroud<br clear="none">>> Shroud matched to the speed and thrust requirement of the vehicle<br clear="none">>> Motor matched to the resulting prop<br clear="none">>><br clear="none">>> Marc<br clear="none">>><br clear="none">>> On 10/28/2013 8:33 AM, Jon Wallace wrote:<br clear="none">>>><br clear="none">>>> What is the cost of having a true Kort nozzle machined by a CNC? I think<br clear="none">>>> a 30% improvement in thrust for $30 would be great but I suspect<br clear="none">>>> machining a Kort is going to equate to many hundreds of dollars, if not<br clear="none">>>> reaching beyond a thousand. When I look at the Snoopy underwater videos<br clear="none">>>> it is difficult to imagine a kort nozzle really making any difference in<br clear="none">>>> the operational experience given that the motors are operating very<br clear="none">>>> slowly and pushing Snoopy around at about 2 knots (estimated). The<br clear="none">>>> props are designed for
power, but that's what we want underwater. True,<br clear="none">>>> a kort nozzle would increase that power but what is the return on the<br clear="none">>>> cost? In other words, on a road with a speed limit of 30mph and no<br clear="none">>>> passing zones it doesn't matter whether you have a 1.6 liter or 5.4<br clear="none">>>> liter engine under the hood does it?<br clear="none">>> --<br clear="none">>> Archivale catalog: <a href="http://www.archivale.com/catalog" target="_blank" rel="nofollow" shape="rect">http://www.archivale.com/catalog</a><br clear="none">>> Polymath weblog: <a href="http://www.archivale.com/weblog" target="_blank" rel="nofollow" shape="rect">http://www.archivale.com/weblog</a><br clear="none">>> Translations (ProZ profile): <a href="http://www.proz.com/profile/639380" target="_blank" rel="nofollow" shape="rect">http://www.proz.com/profile/639380</a><br clear="none">>>
Translations (BeWords profile): <a href="http://www.bewords.com/Marc-dePiolenc" target="_blank" rel="nofollow" shape="rect">http://www.bewords.com/Marc-dePiolenc</a><br clear="none">>> Ducted fans: <a href="http://massflow.archivale.com/" target="_blank" rel="nofollow" shape="rect">http://massflow.archivale.com/</a><br clear="none">>> _______________________________________________<br clear="none">>> Personal_Submersibles mailing list<br clear="none">>> <a rel="nofollow" shape="rect">Personal_Submersibles@psubs.org</a><br clear="none">>> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none">><br clear="none">> _______________________________________________<br clear="none">> Personal_Submersibles mailing list<br clear="none">> <a rel="nofollow" shape="rect">Personal_Submersibles@psubs.org</a><br clear="none">> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a>
<div class="yiv4745745059yqt3416511094" id="yiv4745745059yqtfd64389"><br clear="none">><br clear="none"><br clear="none">-- <br clear="none">Archivale catalog: <a href="http://www.archivale.com/catalog" target="_blank" rel="nofollow" shape="rect">http://www.archivale.com/catalog</a><br clear="none">Polymath weblog: <a href="http://www.archivale.com/weblog" target="_blank" rel="nofollow" shape="rect">http://www.archivale.com/weblog</a><br clear="none">Translations (ProZ profile): <a href="http://www.proz.com/profile/639380" target="_blank" rel="nofollow" shape="rect">http://www.proz.com/profile/639380</a><br clear="none">Translations (BeWords profile): <a href="http://www.bewords.com/Marc-dePiolenc" target="_blank" rel="nofollow" shape="rect">http://www.bewords.com/Marc-dePiolenc</a><br clear="none">Ducted fans: <a href="http://massflow.archivale.com/" target="_blank" rel="nofollow" shape="rect">http://massflow.archivale.com/</a><br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow" shape="rect">Personal_Submersibles@psubs.org</a><br clear="none"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div>
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