<table cellspacing="0" cellpadding="0" border="0"><tr><td valign="top">I just love the world in which we live! Look what I found while waiting to take my daughter to school,.. http://www.quickparts.com/QuickQuote.aspx<br/><br/>Isn't that just the coolest thing! The Star Trek synthesizer in the real world.<br/><br/>Joe<br/><br/>Sent from Yahoo! Mail for iPad</td></tr></table> <div id="_origMsg_">
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<span style="font-weight:bold">From:</span>
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Marc de Piolenc <piolenc@archivale.com>; <br>
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<personal_submersibles@psubs.org>; <br>
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<span style="font-weight:bold">Subject:</span>
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Re: [PSUBS-MAILIST] Group Help Request <br>
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<span style="font-weight:bold">Sent:</span>
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Mon, Oct 28, 2013 10:46:58 AM <br>
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<td valign="top">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 shape="rect" ymailto="mailto:piolenc@archivale.com" href="javascript:return">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 shape="rect" href="http://www.archivale.com/catalog" target="_blank">http://www.archivale.com/catalog</a><br clear="none">>> Polymath weblog: <a shape="rect" href="http://www.archivale.com/weblog" target="_blank">http://www.archivale.com/weblog</a><br clear="none">>> Translations (ProZ profile): <a shape="rect"
href="http://www.proz.com/profile/639380" target="_blank">http://www.proz.com/profile/639380</a><br clear="none">>> Translations (BeWords profile): <a shape="rect" href="http://www.bewords.com/Marc-dePiolenc" target="_blank">http://www.bewords.com/Marc-dePiolenc</a><br clear="none">>> Ducted fans: <a shape="rect" href="http://massflow.archivale.com/" target="_blank">http://massflow.archivale.com/</a><br clear="none">>> _______________________________________________<br clear="none">>> Personal_Submersibles mailing list<br clear="none">>> <a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="javascript:return">Personal_Submersibles@psubs.org</a><br clear="none">>> <a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">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 shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="javascript:return">Personal_Submersibles@psubs.org</a><br clear="none">> <a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><div class="yqt3416511094" id="yqtfd64389"><br clear="none">><br clear="none"><br clear="none">-- <br clear="none">Archivale catalog: <a shape="rect" href="http://www.archivale.com/catalog" target="_blank">http://www.archivale.com/catalog</a><br clear="none">Polymath weblog: <a shape="rect" href="http://www.archivale.com/weblog" target="_blank">http://www.archivale.com/weblog</a><br clear="none">Translations (ProZ profile): <a shape="rect" href="http://www.proz.com/profile/639380"
target="_blank">http://www.proz.com/profile/639380</a><br clear="none">Translations (BeWords profile): <a shape="rect" href="http://www.bewords.com/Marc-dePiolenc" target="_blank">http://www.bewords.com/Marc-dePiolenc</a><br clear="none">Ducted fans: <a shape="rect" href="http://massflow.archivale.com/" target="_blank">http://massflow.archivale.com/</a><br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="javascript:return">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div></td>
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