<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:14pt"><div style="RIGHT: auto"><SPAN style="RIGHT: auto">Ah, 3d printing!</SPAN></div>
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<div style="BACKGROUND-COLOR: transparent; FONT-STYLE: normal; FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; COLOR: rgb(0,0,0); FONT-SIZE: 19px; RIGHT: auto"><SPAN style="RIGHT: auto">You see, I knew some wizard somewhere would come up with the process! Thank you Marc!</SPAN></div>
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<div style="BACKGROUND-COLOR: transparent; FONT-STYLE: normal; FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; COLOR: rgb(0,0,0); FONT-SIZE: 19px; RIGHT: auto"><SPAN style="RIGHT: auto">I will get busy producing those CAD files once I get the dimensions of the 101 in hand. Any PSUBBER wanting a Kort Nozzle on a Minn Kota will have one.</SPAN></div>
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<div style="BACKGROUND-COLOR: transparent; FONT-STYLE: normal; FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; COLOR: rgb(0,0,0); FONT-SIZE: 19px; RIGHT: auto"><SPAN style="RIGHT: auto">Joe</SPAN></div>
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<DIV style="BORDER-BOTTOM: #ccc 1px solid; BORDER-LEFT: #ccc 1px solid; PADDING-BOTTOM: 0px; LINE-HEIGHT: 0; MARGIN: 5px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; HEIGHT: 0px; FONT-SIZE: 0px; BORDER-TOP: #ccc 1px solid; BORDER-RIGHT: #ccc 1px solid; PADDING-TOP: 0px" class=hr contentEditable=false readonly="true"></DIV><FONT size=2 face=Arial><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Marc de Piolenc <piolenc@archivale.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> personal_submersibles@psubs.org <BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Monday, October 28, 2013 6:28 AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [PSUBS-MAILIST] Group Help Request<BR></FONT></DIV>
<DIV class=y_msg_container><BR>Aw shucks, Sir...<BR clear=none><BR clear=none>I forgot to mention that you can probably get a Kort nozzle with <BR clear=none>adequate strength generated using 3-D printing, after designing it in <BR clear=none>some suitable CAD or CAE package. Might be a good deal cheaper than CNC <BR clear=none>machining.<BR clear=none><BR clear=none>To estimate the thrust on the shroud, just guess at what you're getting <BR clear=none>with an open prop, and figure that the shroud will have to take equal <BR clear=none>thrust.<BR clear=none><BR clear=none>Best,<BR clear=none>Marc de Piolenc<BR clear=none>In the tropical paradise known as Mindanao<BR clear=none><BR clear=none>On 10/28/2013 3:31 PM, Alan James wrote:<BR clear=none>> Joe,<BR clear=none>> I was going to suggest that Marc wade in on this subject, it is one of<BR clear=none>> his fields<BR clear=none>> of expertise. I believe he has written books on ducted
fans etc.<BR clear=none>> Marc is a very talented guy hidden away in an obscure corner of the<BR clear=none>> Philippines.He may be a helpful<BR clear=none>> source of information if you want to get this right.<BR clear=none>> We sure have a multi-talented group here.<BR clear=none>> Alan<BR clear=none>><BR clear=none>><BR clear=none>> ------------------------------------------------------------------------<BR clear=none>> *From:* Marc de Piolenc <<A href="mailto:piolenc@archivale.com" shape=rect ymailto="mailto:piolenc@archivale.com">piolenc@archivale.com</A>><BR clear=none>> *To:* Personal Submersibles General Discussion<BR clear=none>> <<A href="mailto:personal_submersibles@psubs.org" shape=rect ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR clear=none>> *Sent:* Monday, October 28, 2013 7:57 PM<BR clear=none>> *Subject:* Re: [PSUBS-MAILIST] Group Help
Request<BR clear=none>><BR clear=none>> Quick clarification: a properly contoured Kort nozzle, MARRIED TO A<BR clear=none>> MATCHING PROPELLER, will increase static and low-speed thrust. Of course<BR clear=none>> it won't increase power, since that comes from your motor. If you just<BR clear=none>> put a shroud around your existing prop, you will be disappointed, and a<BR clear=none>> shroud that doesn't do the job is overpriced unless it's free! Key<BR clear=none>> 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 target=_blank>http://www.archivale.com/catalog</A><BR clear=none>> Polymath weblog: <A href="http://www.archivale.com/weblog" shape=rect target=_blank>http://www.archivale.com/weblog</A><BR clear=none>> Translations (ProZ profile): <A href="http://www.proz.com/profile/639380" shape=rect 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 target=_blank>http://www.bewords.com/Marc-dePiolenc</A><BR clear=none>> Ducted fans: <A href="http://massflow.archivale.com/" shape=rect target=_blank>http://massflow.archivale.com/</A><BR clear=none>><BR
clear=none>> _______________________________________________<BR clear=none>> Personal_Submersibles mailing list<BR clear=none>> <A href="mailto:Personal_Submersibles@psubs.org" shape=rect ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A> <mailto:<A href="mailto:Personal_Submersibles@psubs.org" shape=rect ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A>><BR clear=none>> <A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" shape=rect target=_blank>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR clear=none>><BR clear=none>><BR clear=none>><BR clear=none>><BR clear=none>> _______________________________________________<BR clear=none>> Personal_Submersibles mailing list<BR clear=none>> <A href="mailto:Personal_Submersibles@psubs.org" shape=rect
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<DIV id=yqtfd88515 class=yqt1819766649><BR clear=none>><BR clear=none><BR clear=none>-- <BR clear=none>Archivale catalog: <A href="http://www.archivale.com/catalog" shape=rect target=_blank>http://www.archivale.com/catalog</A><BR clear=none>Polymath weblog: <A href="http://www.archivale.com/weblog" shape=rect target=_blank>http://www.archivale.com/weblog</A><BR clear=none>Translations (ProZ profile): <A href="http://www.proz.com/profile/639380" shape=rect 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 target=_blank>http://www.bewords.com/Marc-dePiolenc</A><BR clear=none>Ducted fans: <A href="http://massflow.archivale.com/" shape=rect target=_blank>http://massflow.archivale.com/</A><BR clear=none>_______________________________________________<BR clear=none>Personal_Submersibles mailing list<BR clear=none><A
href="mailto:Personal_Submersibles@psubs.org" shape=rect ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A><BR clear=none><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" shape=rect target=_blank>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR clear=none></DIV><BR><BR></DIV></DIV></DIV></div></body></html>