<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">Why don't you take a vote on what the best improvement would be for a k sub or alike. My vote would be for a hatch closure from both sides.</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<VAR id=yui-ie-cursor></VAR></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=yiv709035560yqtfd64389 class=yiv709035560yqt3416511094><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>