<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div dir="ltr" id="yui_3_16_0_1_1417721136974_2715"><span id="yui_3_16_0_1_1417721136974_2714">Thanks Hugh,</span></div><div dir="ltr" id="yui_3_16_0_1_1417721136974_2717"><span id="yui_3_16_0_1_1417721136974_2716">had a look at some of the ducted props & they seem a lot different in design from the normal ones.</span></div><div dir="ltr" id="yui_3_16_0_1_1417721136974_2717"><span id="yui_3_16_0_1_1417721136974_3602">One of my problems is I am trying to get away with not using a gear box, & need a very</span></div><div dir="ltr" id="yui_3_16_0_1_1417721136974_2717"><span>low pitch prop to compensate.</span></div><div dir="ltr" id="yui_3_16_0_1_1417721136974_2717"><span id="yui_3_16_0_1_1417721136974_4113">Will have a look around the marine chandleries & see what's on small motors & look at ducted</span></div><div dir="ltr" id="yui_3_16_0_1_1417721136974_2717"><span>props if they have any.</span></div><div dir="ltr" id="yui_3_16_0_1_1417721136974_2717"><span>Might take a cresent with me:)</span></div><div dir="ltr" id="yui_3_16_0_1_1417721136974_2717"><span>Alan</span></div><br> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1417721136974_2679"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1417721136974_2678"> <div dir="ltr" id="yui_3_16_0_1_1417721136974_2677"> <hr size="1" id="yui_3_16_0_1_1417721136974_2718"> <font size="2" face="Arial" id="yui_3_16_0_1_1417721136974_2706"> <b id="yui_3_16_0_1_1417721136974_2709"><span style="font-weight:bold;" id="yui_3_16_0_1_1417721136974_2708">From:</span></b> Hugh Fulton via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> 'Personal Submersibles General Discussion' <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Friday, December 5, 2014 8:18 AM<br> <b id="yui_3_16_0_1_1417721136974_3620"><span style="font-weight: bold;" id="yui_3_16_0_1_1417721136974_3619">Subject:</span></b> Re: [PSUBS-MAILIST] Propeller<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1417721136974_2825"><br><div id="yiv1368643028"><style>#yiv1368643028 #yiv1368643028 --
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#yiv1368643028 </style><div id="yui_3_16_0_1_1417721136974_2828"><div class="yiv1368643028WordSection1" id="yui_3_16_0_1_1417721136974_2827"><div class="yiv1368643028MsoNormal" id="yui_3_16_0_1_1417721136974_2826"><span style="font-size:11.0pt;" id="yui_3_16_0_1_1417721136974_2837">Alan, try bow thruster propellers. They are designed for working at low water speeds and in tubes.</span></div><div class="yiv1368643028MsoNormal" id="yui_3_16_0_1_1417721136974_2829"><span style="font-size:11.0pt;"> </span></div><div id="yui_3_16_0_1_1417721136974_2831"><div class="yiv1368643028MsoNormal" id="yui_3_16_0_1_1417721136974_2830"><span lang="EN-NZ" style="font-size:11.0pt;"> </span></div></div><div class="yiv1368643028MsoNormal" id="yui_3_16_0_1_1417721136974_2832"><span style="font-size:11.0pt;"> </span></div><div class="qtdSeparateBR"><br><br></div><div class="yiv1368643028yqt2683236606" id="yiv1368643028yqt20363"><div id="yui_3_16_0_1_1417721136974_2835"><div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm;" id="yui_3_16_0_1_1417721136974_2834"><div class="yiv1368643028MsoNormal" id="yui_3_16_0_1_1417721136974_2833"><b><span style="font-size:10.0pt;">From:</span></b><span style="font-size:10.0pt;" id="yui_3_16_0_1_1417721136974_2836"> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <b>On Behalf Of </b>Alan James via Personal_Submersibles<br clear="none"><b>Sent:</b> Thursday, 4 December 2014 7:20 p.m.<br clear="none"><b>To:</b> Personal Submersibles General Discussion<br clear="none"><b>Subject:</b> Re: [PSUBS-MAILIST] Propeller</span></div></div></div><div class="yiv1368643028MsoNormal" id="yui_3_16_0_1_1417721136974_4810"> </div><div id="yui_3_16_0_1_1417721136974_4813"><div id="yiv1368643028yui_3_16_0_1_1417673370312_2658"><div class="yiv1368643028MsoNormal" style="background:white;" id="yui_3_16_0_1_1417721136974_4812"><span style="" id="yui_3_16_0_1_1417721136974_4811">Thanks Marc that's helpful.</span></div></div><div id="yiv1368643028yui_3_16_0_1_1417673370312_2658"><div class="yiv1368643028MsoNormal" style="background:white;"><span style="">I could find that the 4" pitch may work well in the kort nozzle then.</span></div></div><div id="yiv1368643028yui_3_16_0_1_1417673370312_2658"><div class="yiv1368643028MsoNormal" style="background:white;"><span style="">Alan</span></div></div><div class="yiv1368643028MsoNormal" style="background:white;"><span style=""> </span></div><div id="yiv1368643028yui_3_16_0_1_1417673370312_2655"><div id="yiv1368643028yui_3_16_0_1_1417673370312_2654"><div id="yiv1368643028yui_3_16_0_1_1417673370312_2653"><div align="center" class="yiv1368643028MsoNormal" style="text-align:center;background:white;"><span style=""></span><hr align="center" size="1" width="100%"></div><div class="yiv1368643028MsoNormal" style="background:white;"><b><span style="font-size:10.0pt;">From:</span></b><span style="font-size:10.0pt;"> Marc de Piolenc via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"><b>To:</b> <a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> <br clear="none"><b>Sent:</b> Thursday, December 4, 2014 5:47 PM<br clear="none"><b>Subject:</b> Re: [PSUBS-MAILIST] Propeller</span><span style=""></span></div></div><div id="yiv1368643028yui_3_16_0_1_1417673370312_2656"><div class="yiv1368643028MsoNormal" style="background:white;"><span style=""><br clear="none">With an accelerating nozzle (designed to enhance mass flow and thrust), <br clear="none">you need coarser pitch for the same rpm. With a decelerating nozzle <br clear="none">(designed to suppress cavitation), speed through the rotor plane is <br clear="none">lower so finer pitch is needed.<br clear="none"><br clear="none">Marc<br clear="none"><br clear="none">On 12/4/2014 5:24 AM, Alan James via Personal_Submersibles wrote:<br clear="none">> I put some specs through an online propeller calculator,<br clear="none">> & I am told I need a 6" prop with a 3" pitch to match my 2 hp motor that<br clear="none">> revs at 3000rpm.<br clear="none">> I checked on other calculators & they also indicate around this size &<br clear="none">> pitch.<br clear="none">> With a kort nozzle there would be more load on the motor so maybe an<br clear="none">> even smaller propeller<br clear="none">> or pitch is required.<br clear="none">> Best I can find is a Yamaha 2hp 7&1/4" plastic prop with 4" pitch.<br clear="none">> I am wanting to experiment with a few props around this size & will<br clear="none">> probably reduce their<br clear="none">> diameter to see what effect it has.<br clear="none">> Any suggestions for an off the shelf prop that might be suitable, or advice?<br clear="none">> Alan<br clear="none">><br clear="none">><br clear="none">> _______________________________________________<br clear="none">> Personal_Submersibles mailing list<br clear="none">> <a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none">> <a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none">><br clear="none"><br clear="none">-- <br clear="none">Archivale catalog: <a rel="nofollow" shape="rect" target="_blank" href="http://www.archivale.com/catalog">http://www.archivale.com/catalog</a><br clear="none">Polymath weblog: <a rel="nofollow" shape="rect" target="_blank" href="http://www.archivale.com/weblog">http://www.archivale.com/weblog</a><br clear="none">Translations (ProZ profile): <a rel="nofollow" shape="rect" target="_blank" href="http://www.proz.com/profile/639380">http://www.proz.com/profile/639380</a><br clear="none">Translations (BeWords profile): <a rel="nofollow" shape="rect" target="_blank" href="http://www.bewords.com/Marc-dePiolenc">http://www.bewords.com/Marc-dePiolenc</a><br clear="none">Ducted fans: <a rel="nofollow" shape="rect" target="_blank" href="http://massflow.archivale.com/">http://massflow.archivale.com/</a></span></div><div><div class="yiv1368643028MsoNormal" style="margin-bottom:12.0pt;background:white;"><span style=""> </span></div></div><div id="yiv1368643028yqtfd57065"><div class="yiv1368643028MsoNormal" style="background:white;"><span style=""><br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a 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