<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div></div><div>Thanks Hank,</div><div>I should mention that another thing I was looking at was the depth that</div><div>I was running the motor. I had read that the top of the propellor blade</div><div>should be at least 12" below the surface & this seemed to be about right.</div><div>I will lift it up a bit & see how it goes next time. </div><div>I am wanting to mount the horizontal thrusters as high as possible to keep</div><div>them as far away from the sea bed as possible when I'm on the bottom.</div><div>Getting them at the right height may take some in depth calculations of</div><div>weight & buoyancy.</div><div>Alan</div><div><br>On 11/01/2019, at 10:57 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 class="ydp5fb4d960yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div></div>
<div>Alan, well done!</div><div>Hank</div><div><br></div>
</div><div id="yahoo_quoted_7330183412" class="yahoo_quoted">
<div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;">
<div>
On Thursday, January 10, 2019, 2:52:43 PM MST, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div dir="ltr">Hi all,<br></div><div dir="ltr">Bolted my brushless thruster on a Minn kotta outboard bracket & took<br></div><div dir="ltr">it for a run on the back of my inflatable yesterday.<br></div><div dir="ltr">Photo shows 48V battery pack in battery box, with an oil compensator, speed<br></div><div dir="ltr">controller in plastic box & red servo tester ( speed input ) on top of it.<br></div><div dir="ltr">The servo tester is wired to the speed controller & turns the pot input into a 2.4ghz signal. I knew this would be the weak link as it was a cheap unit that I had<br></div><div dir="ltr">previously had trouble with. Possibly the loose pin connection in to it.<br></div><div dir="ltr">I had trouble from the start & swapped to my backup which was a radio control<br></div><div dir="ltr">transmitter & receiver. <br></div><div dir="ltr">I was running the brushless motor on sensorless mode. This means the commutation<br></div><div dir="ltr">is sequenced based on position feedback from the motors back emf.<br></div><div dir="ltr">This wasn't working well on high speeds & was jumpy or stopping completely<br></div><div dir="ltr">as it lost it's sequence. All my motors (11) have hall sensors for sensored control<br></div><div dir="ltr">but I had problems setting that up in the computer program so ran without it<br></div><div dir="ltr">as I wanted to get on the water. The speed controller operates on both so the<br></div><div dir="ltr">"not so good" sensorless control is a back up if a sensor fails.<br></div><div dir="ltr">Speed controller temperature got up to 75C, it has an over temperature function<br></div><div dir="ltr">that backs off the power at 80C, so I stopped to let it cool. I did have heat sinks<br></div><div dir="ltr">glued to the top of my battery box to mount the controller on, but when I set up<br></div><div dir="ltr">at the beach I found I couldn't reach that position as the wires weren't long <br></div><div dir="ltr">enough :( . Highly recommend that any motor controllers have good heat sinks<br></div><div dir="ltr">or are heat sinked to the hull as it will increase their life or save them from failing.<br></div><div dir="ltr">Was followed by a small stingray for a while so am thinking the motor may put out<br></div><div dir="ltr">an attractive vibration to them!<br></div><div dir="ltr">The thrust was good & I am intending to have 4 horizontal thrusters, so should<br></div><div dir="ltr">speed along.<br></div><div dir="ltr">A few things to work on before my next outing.<br></div><div dir="ltr">Alan</div><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></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></body></html>