<html><head></head><body><div style="color:#000; background-color:#fff; font-family:verdana, helvetica, sans-serif;font-size:13px"><div id="yui_3_16_0_ym19_1_1492128302808_3761"><span id="yui_3_16_0_ym19_1_1492128302808_3760">Hi Alan,</span></div><div id="yui_3_16_0_ym19_1_1492128302808_3803"><span><br></span></div><div id="yui_3_16_0_ym19_1_1492128302808_3786"><span id="yui_3_16_0_ym19_1_1492128302808_3785">I looked into Vetus props a long time ago and the problem was that they take HUGE amounts of amps to spin because of the pitch.</span></div><div id="yui_3_16_0_ym19_1_1492128302808_3787"><span><br></span></div><div id="yui_3_16_0_ym19_1_1492128302808_3789" dir="ltr"><span id="yui_3_16_0_ym19_1_1492128302808_3788">Many years ago I was over at Busby's house and we were talking about subs needing big props with low pitch and lots of torque. Franks analogy was the props you see on an ice breaker- big slow turning props to get a lot of weight moving. He also showed me pics of the just delivered soviet mir subs (classified at the time). They had really big slow turning props to get a lot of mass moving but not a lot of top speed. Kind of like 1st gear in your auto.</span></div><div id="yui_3_16_0_ym19_1_1492128302808_3937" dir="ltr"><span><br></span></div><div id="yui_3_16_0_ym19_1_1492128302808_3940" dir="ltr">Greg C<br id="yui_3_16_0_ym19_1_1492128302808_4037"><br></div><div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1492128302808_3859" style="display: block;"> <div id="yui_3_16_0_ym19_1_1492128302808_3858" style="font-family: verdana, helvetica, sans-serif; font-size: 13px;"> <div id="yui_3_16_0_ym19_1_1492128302808_3857" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym19_1_1492128302808_3856" dir="ltr"> <font id="yui_3_16_0_ym19_1_1492128302808_3855" face="Arial" size="2"> <hr size="1" id="yui_3_16_0_ym19_1_1492128302808_3854"> <b><span style="font-weight: bold;">From:</span></b> Alan 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, April 13, 2017 7:54 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> [PSUBS-MAILIST] Plastic Propeller<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1492128302808_3938"><br><div dir="ltr">Greg, (or anyone else as knowledgeable)<br></div><div dir="ltr">I am going to test a Vetus 146mm propeller soon. On paper it<br></div><div dir="ltr">seems a good match to my motor. I have not seen a left hand prop (which I<br></div><div dir="ltr">need) & the right hands go between $56- & $100-. Also I may need a slightly<br></div><div id="yui_3_16_0_ym19_1_1492128302808_4058" dir="ltr">smaller diameter. They are made of delrin. <br></div><div dir="ltr">Is there an easy / inexpensive way of replicating <br></div><div dir="ltr">something similar? I was thinking they could be printed & the print used<br></div><div id="yui_3_16_0_ym19_1_1492128302808_4061" dir="ltr">as a lost wax type aluminium casting.<br></div><div id="yui_3_16_0_ym19_1_1492128302808_4060" dir="ltr">I could make a silicon mold from a print & cast a fiber reinforced propeller, <br></div><div id="yui_3_16_0_ym19_1_1492128302808_4059" dir="ltr">but aren't sure about the strength & quality I could get.<br></div><div dir="ltr">Any thoughts on the best way of doing this?<br></div><div dir="ltr">Thanks, Alan<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">Sent from my iPad<br></div><div dir="ltr"><br></div><div dir="ltr">_______________________________________________<br></div><div dir="ltr">Personal_Submersibles mailing list<br></div><div dir="ltr"><a href="mailto:Personal_Submersibles@psubs.org" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br></div><div dir="ltr"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></div><br><br></div> </div> </div> </div></div></body></html>