<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Hank,</div><div id="AppleMailSignature">additionally you have to replace the propeller shaft with stainless.</div><div id="AppleMailSignature">It is a press fit into the bell ( outer spinning part) you also need to </div><div id="AppleMailSignature">cut a few circlip grooves.</div><div id="AppleMailSignature">Should mention that there are inrunner & outrunner brushless motors.</div><div id="AppleMailSignature">You are wanting the outrunner as they have a lower rpm for a given</div><div id="AppleMailSignature">size & more torque. There is an important term "kv" which is no load revs</div><div id="AppleMailSignature">per volt applied. You can have the same size motor with the option of</div><div id="AppleMailSignature">several different kv's due to the motor windings. You want the lowest</div><div id="AppleMailSignature">kv if you are going direct drive. Mine are 6374 motors (63 diameter 74 length)</div><div id="AppleMailSignature">with a 60kv rating. I had mine especially wound but you can now buy them</div><div id="AppleMailSignature">off the shelf. </div><div id="AppleMailSignature">There are some pretty cheap rovs that would save you a lot of time</div><div id="AppleMailSignature">& learning, however these little motors are amazing & worth playing with..</div><div id="AppleMailSignature">Alan<br><br>Sent from my iPad</div><div><br>On 14/11/2017, at 6:30 AM, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><div>Hank,</div><div>didn't click that this was for your rov project.</div><div>The brushless motors are a 3 phase motor & need a brushless motor</div><div>controller. I am not sure how far you can run the controller from the motor.</div><div>You would have to have the controller on the rov & signal wires in the sub.</div><div>The motors & controllers are quite cheap through Hobby King or China.</div><div>There are mounts that normally come with the motors.</div><div>You could buy a 36V option. Hobby motors are classed in S's, 1S is 3..7V</div><div>so 10S is 37V.</div><div>They come in two flavours, sensored & uncensored. Sensored have rough</div><div>start up & low speed characteristics under load. However if you go with</div><div>sensored then you have to coat the sensor board, & I'm not sure how the</div><div>sensors will perform with a coating on them.</div><div>The company blue robotics has the whole thruster minus the speed controller</div><div>for $169-</div><div><a href="https://www.bluerobotics.com/store/thrusters/t200-thruster/">https://www.bluerobotics..com/store/thrusters/t200-thruster/</a></div><div>Well worth the price for the time you'll save.</div><div>Cheers Alan<br><br><div>Sent from my iPad</div></div><div><br>On 14/11/2017, at 2:10 AM, 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><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div></div>
<div>Alan,</div><div>Yes they are low powered, but that works for me because I am not dragging a 300 foot tether. My tether will be 50 feet. Do the brushless motors need a special controller? or will a PWM controller work? We tend to design and build things to last for an unrealistic life span. You mentioned a while back about water bearings lasting only 2,000 hrs. I doubt any Psub will see 2,000 hrs in its entire life time. If an 119 dollar ROV motor lasts 100 hr, I would get several years out of it. I am very realistic about spending versus life expectancy.</div><div>Hank</div><div><br></div>
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On Monday, November 13, 2017, 5:08:40 AM MST, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:
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<div><div id="yiv0349373708"><div><div>Hank,</div><div id="yiv0349373708AppleMailSignature">yes there is a lot of DIY in some of those groups.</div><div id="yiv0349373708AppleMailSignature">I did run a motor without a housing & things like the magnets got rusty.</div><div id="yiv0349373708AppleMailSignature">I don't think they would stand up to sea water & any mucky water. As</div><div id="yiv0349373708AppleMailSignature">the motors would have any thin layers of expoxy / glue sand blasted off.</div><div id="yiv0349373708AppleMailSignature">From memory the motors were reasonably low powered.</div><div id="yiv0349373708AppleMailSignature">Alan</div><div id="yiv0349373708AppleMailSignature"><br clear="none"><br clear="none">Sent from my iPad</div><div class="yiv0349373708yqt0999437567" id="yiv0349373708yqt76959"><div><br clear="none">On 14/11/2017, at 12:44 AM, hank pronk 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>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div>Alan,</div><div>I joined an ROV group and have found some pretty interesting thruster stuff. I think you have done the same? You can buy thrusters that are brushless and built to run in the water with no sealing. Sounds like they just epoxy the armature and replace the bushings with plastic. </div><div>Hank</div></div></div></blockquote></div><blockquote type="cite"><div><span>_______________________________________________</span><br clear="none"><span>Personal_Submersibles mailing list</span><br clear="none"><span><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br clear="none"><span><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></span><br clear="none"></div></blockquote></div></div><div class="yqt0999437567" id="yqt03767">_______________________________________________<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></div>
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