<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div style="-webkit-text-size-adjust: auto;">Update,</div><div style="-webkit-text-size-adjust: auto;">Am still Googling away in pursuit of a home made brushless thruster.</div><div style="-webkit-text-size-adjust: auto;">I am set on using an in-runner motor as they have the coils on the outside & will be able</div><div style="-webkit-text-size-adjust: auto;">to transfer heat through the can.</div><div style="-webkit-text-size-adjust: auto;">The problem with in-runners is they have higher revs than out-runners, however either will </div><div style="-webkit-text-size-adjust: auto;">require a planetary gearbox. I am looking at reducing the revs down to below 3000 rpm. </div><div style="-webkit-text-size-adjust: auto;">This is based on other brushless thrusters I have looked at but might not be right ( any recommendations)?</div><div style="-webkit-text-size-adjust: auto;">Another problem is that most seem to draw huge amps.</div><div style="-webkit-text-size-adjust: auto;">Here is a 1200W motor for $30-. Of course there is the price of the controller & planetary gear that are needed.</div><div><span style="-webkit-text-size-adjust: auto;"><a href="http://www.hobbyking.co.uk/mobile/viewproduct.asp?idproduct=17720&type=&idparentcat=364">http://www.hobbyking.co.uk/mobile/viewproduct.asp?idproduct=17720&type=&idparentcat=364</a></span></div><div><span style="-webkit-text-size-adjust: auto;">Most of the suitable motors seem to be found at places like Hobby King, and are used on RC trucks, or found on E bike sights. The aircraft motors aren't as robust.</span></div><div style="-webkit-text-size-adjust: auto;">These motors are tiny, but hugely powerful, so there is the potential to make a small streamlined</div><div style="-webkit-text-size-adjust: auto;">powerful unit.</div><div style="-webkit-text-size-adjust: auto;">I haven't had much luck with a matching gearbox. Some of the planetary gearboxes recommend</div><div style="-webkit-text-size-adjust: auto;">oiling (no good to me unless I oil compensate) while others don't. I am looking for a cylindrical unit to match my motor, preferably with thrust bearings.</div><div style="-webkit-text-size-adjust: auto;">If anyones got any advice or experience in this realm I'd be pleased to hear it.</div><div style="-webkit-text-size-adjust: auto;">Regards Alan</div><div style="-webkit-text-size-adjust: auto;"><br></div><div style="-webkit-text-size-adjust: auto;"><br>Sent from my iPad</div><div style="-webkit-text-size-adjust: auto;"><br>On 7/09/2014, at 8:43 pm, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite" style="-webkit-text-size-adjust: auto;"><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><div>Hi Hank,</div><div>the kort nozzle on the Indonesian thruster looks a bit Naff. </div><div>( I am designing an art work here.)</div><div>I could get a price for the unit without kort nozzle, but</div><div>I'm wondering if I could build something for 1/2 that price.</div><div>There are some reasonably priced brushless motors about.</div><div>I don't know that I could just retro fit a thrust bearing inside the can of the motor.</div><div>I tried to put a thrust bearing for reverse inside my brushed thrusters, but</div><div>couldn't find one with a thin enough section to fit.</div><div>Also the motors are a bit expensive to just buy & hope you can fit one.</div><div>How did you fit the thrust bearing on Gamma? Did the propellor shaft extend out the back</div><div>of the motor?</div><div>Alan</div><div><br><br>Sent from my iPad</div><div><br>On 7/09/2014, at 7:22 pm, hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><table cellspacing="0" cellpadding="0" border="0"><tbody><tr><td valign="top"><div>Allan<br>Dont worry about thrust bearings to much. They are aesy to get, I bought one for Gamma , real heavy duty for 80 dollars. Personally I would just use a good quality bearing and replace it once a year for 8 bucks, if it is a small thruster. Are you not happy with the Indonesia thrusters? Or to pricey?<br>Hank</div></td></tr></tbody></table> <div id="_origMsg_">
<div>
<br>
<div>
<div style="font-size:0.9em">
<hr size="1">
<b>
<span style="font-weight:bold">From:</span>
</b>
Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>; <br>
<b>
<span style="font-weight:bold">To:</span>
</b>
Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>; <br>
<b>
<span style="font-weight:bold">Subject:</span>
</b>
[PSUBS-MAILIST] Brushless Thrusters <br>
<b>
<span style="font-weight:bold">Sent:</span>
</b>
Sun, Sep 7, 2014 11:58:56 AM <br>
</div>
<br>
<table cellspacing="0" cellpadding="0" border="0">
<tbody>
<tr>
<td valign="top">Hi people,<br>I've spent several hours today looking at brushless thrusters & wonder if anyone else has looked at them or got any ideas. There is the Indonesian thruster I posted a few weeks back at US 2,200. There is also the Haswing Protruar 2hp that Emile has; however they state that it's for fresh water only, & I think Emile said it was a bit noisy.<br>The inrunner motors that have the winding on the outside, seem a good option as they cool through convection to the can. They also need higher revs for torque & require a planetary gear box or similar. ( which a lot have built in)<br> I was looking at the option of making my own thruster, however the motor would require a thrust bearing & I don't<br>know of any that would have one other than maybe a high powered battery operated drill.<br>Any thoughts, suggestions thanks.<br>Alan<br><br>Sent from my
iPad<br>_______________________________________________<br>Personal_Submersibles mailing list<br><a ymailto="mailto:Personal_Submersibles@psubs.org" href="javascript:return">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote></div></blockquote><blockquote type="cite" style="-webkit-text-size-adjust: auto;"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote></body></html>