<html><body><div style="color:#000; background-color:#fff; font-family:tahoma, new york, times, serif;font-size:12pt"><div style="RIGHT: auto"><SPAN style="RIGHT: auto">Joe,</SPAN></div>
<div style="FONT-SIZE: 16px; FONT-FAMILY: tahoma, new york, times, serif; RIGHT: auto; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><SPAN style="RIGHT: auto">The beauty of being a hobby amateur sub builder designer is, your projects do not need to be practical. Your project only needs to be fun and safe. If your kort nozzle fails to deliver at a low cost, who cares. We tend to talk about the things that work. I have shelves full of unfinished and failed projects and I am proud of it . I am sure many others have the same.<VAR id=yui-ie-cursor></VAR></SPAN></div>
<div style="FONT-SIZE: 16px; FONT-FAMILY: tahoma, new york, times, serif; RIGHT: auto; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><SPAN style="RIGHT: auto">Hank</SPAN></div>
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<DIV class=hr style="FONT-SIZE: 0px; BORDER-TOP: #ccc 1px solid; HEIGHT: 0px; BORDER-RIGHT: #ccc 1px solid; BORDER-BOTTOM: #ccc 1px solid; PADDING-BOTTOM: 0px; PADDING-TOP: 0px; PADDING-LEFT: 0px; MARGIN: 5px 0px; BORDER-LEFT: #ccc 1px solid; LINE-HEIGHT: 0; PADDING-RIGHT: 0px" readonly="true" contenteditable="false"></DIV><FONT size=2 face=Arial><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Joe Perkel <josephperkel@yahoo.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> "personal_submersibles@psubs.org" <personal_submersibles@psubs.org> <BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Monday, October 28, 2013 5:41:42 AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [PSUBS-MAILIST] Group Help Request<BR></FONT></DIV>
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<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></TBODY></TABLE>
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<DIV class=hr style="FONT-SIZE: 0px; BORDER-TOP: #ccc 1px solid; HEIGHT: 0px; BORDER-RIGHT: #ccc 1px solid; BORDER-BOTTOM: #ccc 1px solid; PADDING-BOTTOM: 0px; PADDING-TOP: 0px; PADDING-LEFT: 0px; MARGIN: 5px 0px; BORDER-LEFT: #ccc 1px solid; LINE-HEIGHT: 0; PADDING-RIGHT: 0px" readonly="true" contenteditable="false"></DIV><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN> </B>Marc de Piolenc <piolenc@archivale.com>; <WBR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN> </B><personal_submersibles@psubs.org>; <WBR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN> </B>Re: [PSUBS-MAILIST] Group Help Request <WBR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN> </B>Mon, Oct 28, 2013 10:46:58 AM <WBR></DIV><WBR>
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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 href="" shape=rect rel=nofollow>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" shape=rect rel=nofollow target=_blank>http://www.archivale.com/catalog</A><BR clear=none>>> Polymath weblog: <A href="http://www.archivale.com/weblog" shape=rect rel=nofollow target=_blank>http://www.archivale.com/weblog</A><BR clear=none>>> Translations (ProZ profile): <A href="http://www.proz.com/profile/639380" shape=rect rel=nofollow target=_blank>http://www.proz.com/profile/639380</A><BR clear=none>>> Translations (BeWords profile): <A
href="http://www.bewords.com/Marc-dePiolenc" shape=rect rel=nofollow target=_blank>http://www.bewords.com/Marc-dePiolenc</A><BR clear=none>>> Ducted fans: <A href="http://massflow.archivale.com/" shape=rect rel=nofollow target=_blank>http://massflow.archivale.com/</A><BR clear=none>>> _______________________________________________<BR clear=none>>> Personal_Submersibles mailing list<BR clear=none>>> <A href="" shape=rect rel=nofollow>Personal_Submersibles@psubs.org</A><BR clear=none>>> <A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" shape=rect rel=nofollow 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 href="" shape=rect rel=nofollow>Personal_Submersibles@psubs.org</A><BR clear=none>> <A
href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" shape=rect rel=nofollow target=_blank>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A>
<DIV id=yiv2004420080yqtfd64389 class=yiv2004420080yqt3416511094><WBR>><WBR><WBR>-- <WBR>Archivale catalog: <A href="http://www.archivale.com/catalog" shape=rect rel=nofollow target=_blank>http://www.archivale.com/catalog</A><WBR>Polymath weblog: <A href="http://www.archivale.com/weblog" shape=rect rel=nofollow target=_blank>http://www.archivale.com/weblog</A><WBR>Translations (ProZ profile): <A href="http://www.proz.com/profile/639380" shape=rect rel=nofollow target=_blank>http://www.proz.com/profile/639380</A><WBR>Translations (BeWords profile): <A href="http://www.bewords.com/Marc-dePiolenc" shape=rect rel=nofollow target=_blank>http://www.bewords.com/Marc-dePiolenc</A><WBR>Ducted fans: <A href="http://massflow.archivale.com/" shape=rect rel=nofollow target=_blank>http://massflow.archivale.com/</A><WBR>_______________________________________________<WBR>Personal_Submersibles mailing list<WBR><A href="" shape=rect
rel=nofollow>Personal_Submersibles@psubs.org</A><WBR><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" shape=rect rel=nofollow target=_blank>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><WBR></DIV></TD></TR></TBODY></TABLE></DIV></DIV></DIV></DIV><WBR>_______________________________________________<WBR>Personal_Submersibles mailing list<WBR><A href="mailto:Personal_Submersibles@psubs.org" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A><WBR><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target=_blank>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><WBR><WBR><WBR></DIV></DIV></DIV></div></body></html>