<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_1414711859269_2965" dir="ltr"><span id="yui_3_16_0_1_1414711859269_3111">Hi Brian,</span></div><div id="yui_3_16_0_1_1414711859269_2965" dir="ltr"><span id="yui_3_16_0_1_1414711859269_3110">thanks. That one is 15hp & 8" diameter.</span></div><div id="yui_3_16_0_1_1414711859269_2965" dir="ltr"><span id="yui_3_16_0_1_1414711859269_3067">The motor I do have is 2hp & 2" diameter but just revs</span></div><div id="yui_3_16_0_1_1414711859269_2965" dir="ltr"><span id="yui_3_16_0_1_1414711859269_3068">too fast. Hopefully I will find a solution that doesn't need a gear box.</span></div><div id="yui_3_16_0_1_1414711859269_2965" 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_1414711859269_3087"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1414711859269_3086"> <div dir="ltr" id="yui_3_16_0_1_1414711859269_3085"> <hr size="1"> <font size="2" face="Arial" id="yui_3_16_0_1_1414711859269_3088"> <b><span style="font-weight:bold;">From:</span></b> Brian Cox 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, October 31, 2014 12:25 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Alan needs a motor<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1414711859269_3089"><br><div id="yiv9339832828"><div id="yui_3_16_0_1_1414711859269_3092"><div style="font-family:Arial, sans-serif;font-size:10pt;" id="yui_3_16_0_1_1414711859269_3091"><div id="yui_3_16_0_1_1414711859269_3090">What about this one?</div><div id="yui_3_16_0_1_1414711859269_3109"> </div><div id="yui_3_16_0_1_1414711859269_3108"><a rel="nofollow" shape="rect" target="_blank" href="http://www.thunderstruck-ev.com/motenergy-me0909.html" id="yui_3_16_0_1_1414711859269_3107">http://www.thunderstruck-ev.com/motenergy-me0909.html</a></div><div id="yui_3_16_0_1_1414711859269_3106"> </div><div id="yui_3_16_0_1_1414711859269_3105">brian<br clear="none"><br clear="none">--- personal_submersibles@psubs.org wrote:<br clear="none"><br clear="none">From: Alan James via Personal_Submersibles <personal_submersibles@psubs.org><br clear="none">To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><br clear="none">Subject: Re: [PSUBS-MAILIST] Alan needs a motor<br clear="none">Date: Thu, 30 Oct 2014 20:22:42 +0000 (UTC)<br clear="none"><br clear="none"></div><div class="qtdSeparateBR"><br><br></div><div class="yiv9339832828yqt6247256516" id="yiv9339832828yqt12348"><div style="color:rgb(0, 0, 0);font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;background-color:rgb(255, 255, 255);" id="yui_3_16_0_1_1414711859269_3102"><div dir="ltr" id="yui_3_16_0_1_1414711859269_3104"><span id="yui_3_16_0_1_1414711859269_3103">Thanks Hank & Graham.</span></div><div dir="ltr"><span>I am probably searching for Nirvana here.</span></div><div dir="ltr" id="yui_3_16_0_1_1414711859269_3101"><span id="yui_3_16_0_1_1414711859269_3100">First I am set on finding a brushless motor solution.</span></div><div dir="ltr"><span>I spent multiple hours of Googling, focusing on E-bikes, scooters etc.</span></div><div dir="ltr"><span>The E-bikes are mainly hub motors that are narrow with a large diameter, which</span></div><div dir="ltr"><span>is no good as far as drag is concerned, plus you need a big prop to get out beyond</span></div><div dir="ltr"><span>the diameter of the motor. There are units with 5-1 gear box ratios at 48V 1500W</span></div><div dir="ltr"><span>but they can weigh around 14kg. I bought an 1850W Hobby King BLDC outrunner</span></div><div dir="ltr"><span>motor for $56- & it weighs 530 grams. So more powerful & 1/27th the weight.</span></div><div dir="ltr"><span>This does 236 rpm per volt, & from what I've read you don't want to be turning your</span></div><div dir="ltr"><span>prop at more than 3000rpm on a sub. This means I would have to drive this motor with </span></div><div dir="ltr"><span>a maximum of 12V & it's rated for a maximum of 37.</span></div><div dir="ltr"><span>To disipate the heat from the stationary inner coil of an outrunner, I may be forced to</span></div><div dir="ltr"><span>go with oil compensation; which is what most commercial brushless thrusters are anyway.</span></div><div dir="ltr"><span>One solution I can see is to go with a much larger hobby type motor & run it way below</span></div><div dir="ltr"><span>it's maximum voltage to keep the revs down. Also I wouldn't be thrashing the motor</span></div><div dir="ltr"><span>which may help it live a lot longer.</span></div><div dir="ltr"><span>Need to do a lot more study here, then experimentation with motors & props in water.</span></div><div dir="ltr"><span>Alan</span></div><div dir="ltr"><span>P.S. Hank I was given a motorized Golf trundler & converted it to a trike with ape hangers</span></div><div dir="ltr"><span>and pink banana seat for my girls. Boy did they love showing off on that.</span></div><br clear="none"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div dir="ltr"> <hr size="1"> <font face="Arial" size="2"> <b><span style="font-weight:bold;">From:</span></b> hank pronk via Personal_Submersibles <personal_submersibles@psubs.org><br clear="none"> <b><span style="font-weight:bold;">To:</span></b> personal_submersibles@psubs.org <br clear="none"> <b><span style="font-weight:bold;">Sent:</span></b> Friday, October 31, 2014 1:32 AM<br clear="none"> <b><span style="font-weight:bold;">Subject:</span></b> [PSUBS-MAILIST] Alan needs a motor<br clear="none"> </font> </div> <div><br clear="none">Alan,<br clear="none">I just went on ebay and found a 1,000 watt 48v brushless motor with controller for 200 dollars. It is for an electric bike. I bought one for my son a few years back and it was amazing. He was driving it all over town and towing his buddy on his skate board. Just type in brushless 48 v motor.<br clear="none">You won't need a gearbox either.<br clear="none">Hank<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"></div> </div> </div> </div></div>_______________________________________________
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