<html><head></head><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_1450592281996_3400"><span>Hi Pete,</span></div><div id="yui_3_16_0_1_1450592281996_3400"><span id="yui_3_16_0_1_1450592281996_3490">I have had a look at Doug's experiments with motors in the past.</span></div><div id="yui_3_16_0_1_1450592281996_3400">Some of them failed. & it may be a different story with bigger motors</div><div id="yui_3_16_0_1_1450592281996_3400" dir="ltr">& higher voltage.</div><div id="yui_3_16_0_1_1450592281996_3400" dir="ltr"><span id="yui_3_16_0_1_1450592281996_3424">I also have followed blue robotics since they started out as a Kick start venture. </span></div><div id="yui_3_16_0_1_1450592281996_3400" dir="ltr"><span id="yui_3_16_0_1_1450592281996_3718">One problem I can see with the exposed motor is that with all the water</span></div><div id="yui_3_16_0_1_1450592281996_3400" dir="ltr"><span id="yui_3_16_0_1_1450592281996_3715">with sand, grit etc in it, flowing over the windings, it will wear down</span></div><div id="yui_3_16_0_1_1450592281996_3400" dir="ltr"><span id="yui_3_16_0_1_1450592281996_3991">the windings thin coating.</span></div><div id="yui_3_16_0_1_1450592281996_3400" dir="ltr"><span>Cheers Alan</span></div><br> <div class="qtdSeparateBR" id="yui_3_16_0_1_1450592281996_3376"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_1_1450592281996_3375" style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1450592281996_3374"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1450592281996_3373"> <div dir="ltr" id="yui_3_16_0_1_1450592281996_3372"> <font size="2" face="Arial" id="yui_3_16_0_1_1450592281996_3572"> <hr size="1" id="yui_3_16_0_1_1450592281996_3573"> <b><span style="font-weight:bold;">From:</span></b> Pete Niedermayr 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> Sunday, December 20, 2015 4:44 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] ROV opportunity<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1450592281996_3814"><br>The Blue Robotics guys potted the terminals with epoxy and the thrusters are made with stainless/ plastic and aluminum. Doug was testing in simulated sea water.(ocean in a bag)<br><br>Pete<br>--------------------------------------------<br>On Sat, 12/19/15, Alan James via Personal_Submersibles <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br> Subject: Re: [PSUBS-MAILIST] ROV opportunity<br> To: "Personal Submersibles General Discussion" <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br> Date: Saturday, December 19, 2015, 7:12 PM<br> <br> Pete,I ran a<br> 2000W motor in fresh water with a propeller but no<br> housing.It worked<br> well but was worse for wear afterward with a bit of<br> rustshowing +<br> the bearings seemed a bit rougher. From memory<br> therewas<br> rust on the magnets.Salt<br> water is a lot better conductor than fresh, so you would get<br> currentrunning<br> from the + to the - terminal & bi-passing the wire<br> windings.I think<br> it would be more trouble than it was worth to waterproof<br> &corrosion<br> proof the motor. And then there is the sand in the<br> bearings.Cheers<br> Alan<br> <br> <br> <br> From: Pete<br> Niedermayr via Personal_Submersibles<br> <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br> <br> To: Personal<br> Submersibles General Discussion<br> <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org" id="yui_3_16_0_1_1450592281996_4195">personal_submersibles@psubs.org</a>> <br> <br> Sent: Sunday,<br> December 20, 2015 1:38 PM<br> Subject: Re:<br> [PSUBS-MAILIST] ROV opportunity<br> <br> <br> These thrusters are interesting in that they<br> are made with stainless/ plastic and aluminum. they are open<br> to the water and water actually runs thru them and cools<br> them. They claim that they can even handle some amount of<br> sand particles in the water. They are very small but<br> perfect for ROV use. <br> <br> Could this be done with thruster sized motors.I<br> saw Doug Jackson doing the same thing with his ROV<br> motors.<br> <br> Pete<br> <br> <br> --------------------------------------------<br> On Fri, 12/18/15, Douglas Suhr via<br> Personal_Submersibles <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br> wrote:<br> <br> Subject: Re:<br> [PSUBS-MAILIST] ROV opportunity<br> To:<br> "Personal Submersibles General Discussion" <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br> Date: Friday, December 18, 2015, 6:16 PM<br> <br> Sounds<br> like<br> a cool opportunity if you've got the willingness<br> and time Brian. This past summer dad and I<br> were on the hunt<br> for a missing outboard<br> motor on a Canadian lake. We had a<br> camera<br> but no ROV. We actually ended up cutting a 15 foot<br> sapling to use as a camera pole. Depth was<br> only 17 − 20<br> feet so the sapling worked<br> pretty well as a camera handle<br> from the<br> boat (and we found the motor), but a controllable<br> ROV would have made things much easier.<br> It looks like those guys make some<br> nice parts for ROV projects. The technical<br> (software) aspect<br> scares me a bit, but<br> that's only because I am<br> electronically<br> challenged. ~ Douglas S. <br> On Fri, Dec 18,<br> 2015 at<br> 11:30 AM, Brian Cox via<br> Personal_Submersibles <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br> wrote:<br> Hi<br> <br> All, In my search<br> for some Soda Sorb I stumbled on to a dive<br> shop down in<br> Hollywierd , the shop owner<br> does a lot of business with<br> the studios and<br> wants me to build him a ROV camera<br> <br> platform which has certain capabilities that are not<br> available at the present time. I'm<br> thinking about<br> trying to come up with<br> something for him. I found these<br> nifty<br> thrusters made by these highly motivated kids. <br> Link: <a href="https://www.bluerobotics.com/%C2%A0These" target="_blank">https://www.bluerobotics.com/ These</a><br> thrusters are interesting in that they are<br> made with<br> stainless/ plastic and aluminum.<br> they are open to the water<br> and water<br> actually runs thru them and cools them. They<br> claim that they can even handle some amount of<br> sand<br> particles in the water. They are<br> very small but perfect<br> for ROV use. <br> Brian<br> Cox<br> <br> _______________________________________________<br> <br> Personal_Submersibles<br> mailing list<br> <br> <a ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br> <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> <br> <br> <br> <br> -----Inline Attachment<br> Follows-----<br> <br> <br> _______________________________________________<br> Personal_Submersibles mailing list<br> <a ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">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> <br> _______________________________________________<br> Personal_Submersibles mailing list<br> <a ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">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> <br> <br> <br> <br> -----Inline Attachment Follows-----<br> <br> _______________________________________________<br> Personal_Submersibles mailing list<br> <a ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">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><br>_______________________________________________<br>Personal_Submersibles mailing list<br><a ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">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><br><br></div> </div> </div> </div></div></body></html>