<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1417673370312_2658" dir="ltr"><span>Thanks Marc that's helpful.</span></div><div id="yui_3_16_0_1_1417673370312_2658" dir="ltr"><span>I could find that the 4" pitch may work well in the kort nozzle then.</span></div><div id="yui_3_16_0_1_1417673370312_2658" dir="ltr"><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_1417673370312_2655"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1417673370312_2654"> <div dir="ltr" id="yui_3_16_0_1_1417673370312_2653"> <hr size="1"> <font size="2" face="Arial" id="yui_3_16_0_1_1417673370312_2652"> <b><span style="font-weight:bold;">From:</span></b> Marc de Piolenc via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> personal_submersibles@psubs.org <br> <b><span style="font-weight: bold;">Sent:</span></b> Thursday, December 4, 2014 5:47 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Propeller<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1417673370312_2656"><br>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 shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">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">-- <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><div class="qtdSeparateBR"><br><br></div><div class="yqt6461773109" id="yqtfd57065"><br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">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><br><br></div> </div> </div> </div></body></html>