<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Hank,</div><div id="AppleMailSignature">Yes it would be great for boarding the sub in rough weather.</div><div id="AppleMailSignature">You only need to look at the treatment they can take white water rafting.</div><div id="AppleMailSignature">Have owned a couple & used them in surf.</div><div id="AppleMailSignature">I have a Chinese Kelley controller, I think Hugh does too. They are economical</div><div id="AppleMailSignature">& have a good reputation. I have had good customer support when I have </div><div id="AppleMailSignature">asked questions.</div><div id="AppleMailSignature">Alan</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature"><br><br>Sent from my iPad</div><div><br>On 26/08/2017, at 11:52 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>Alan,</div></div><div>I am going back to switches for now and will get proper controllers over the winter. Lucky for me I have back up travel motors that saved the day.</div><div>Also my inflatable is an absolute dream! can bump into the sub all you want. Now I just hit the brakes and Gamma drifts off untethered off the trailer. Then I park the truck and hop in the inflatable to retrieve Gamma. Nice!</div><div>Hank</div><div><br></div><div><br></div><div id="yahoo_quoted_4165792797" class="yahoo_quoted"><div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;"><div>On Friday, August 25, 2017, 5:45:29 PM MDT, 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 id="yiv4576551946"><div><div>They should have DC brushless controllers down to a fine art.</div><div id="yiv4576551946AppleMailSignature">There are so many electric bikes & rickshaws over there.</div><div id="yiv4576551946AppleMailSignature">Also they are so dominant in the electric RC market that requires </div><div id="yiv4576551946AppleMailSignature">reliable DC controllers.</div><div id="yiv4576551946AppleMailSignature">Maybe Hank got some backyard manufacturer using parts from</div><div id="yiv4576551946AppleMailSignature">old TVs.</div><div id="yiv4576551946AppleMailSignature">I was told to over size my controller by about double.</div><div id="yiv4576551946AppleMailSignature">Buy a 3000W controller for a 1500W motor.</div><div id="yiv4576551946AppleMailSignature">Also the manufacturers get nervous when you talk about long</div><div id="yiv4576551946AppleMailSignature">wire runs from your battery bank to controller. I am not totally</div><div id="yiv4576551946AppleMailSignature">clued up on this, but have heard it said to add capacitors along</div><div id="yiv4576551946AppleMailSignature">the wire run & twist the wires together to avoid inrush current</div><div id="yiv4576551946AppleMailSignature">from the break down of the electric field in the wiring. The PWM</div><div id="yiv4576551946AppleMailSignature">would cause a constant building up & breaking down of the magnetic</div><div id="yiv4576551946AppleMailSignature">field & a consequent surging of electricity into the input capacitors.</div><div id="yiv4576551946AppleMailSignature">I guess a way around this would be to place the controller as close</div><div id="yiv4576551946AppleMailSignature">as possible to the battery source & run long runs of wire to the speed</div><div id="yiv4576551946AppleMailSignature">control potentiometer & on switch.</div><div id="yiv4576551946AppleMailSignature">These days the controllers have all sorts of parameters you have to</div><div id="yiv4576551946AppleMailSignature">program in to them when they arrive. Gets very confusing!</div><div id="yiv4576551946AppleMailSignature">Alan</div><div id="yiv4576551946AppleMailSignature"><br clear="none"><br clear="none">Sent from my iPad</div><div class="yiv4576551946yqt7716780244" id="yiv4576551946yqt59360"><div><br clear="none">On 26/08/2017, at 11:15 AM, Sean T. Stevenson 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><p dir="ltr">I read a book about manufacturing in China which I found quite interesting:</p>
<p dir="ltr">"Poorly Made in China" by Paul Midler.</p>
<p dir="ltr">Gives some of the background explanation behind the lack of quality control.</p>
<p dir="ltr">Sean<br clear="none">
</p>
<br clear="none"><br clear="none"><div class="yiv4576551946gmail_quote">On August 25, 2017 4:23:28 PM MDT, 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:<blockquote class="yiv4576551946gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex;">
<div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div>Well I learned another lesson today. I went for a very unexpected dive in Gamma today and both new speed controllers quit. Don't buy electronic parts from China ! Ever! </div><div>Hank</div></div><p style="margin-top:2.5em;margin-bottom:1em;border-bottom:1px solid #000;"></p><pre class="yiv4576551946k9mail"></pre><hr><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"></blockquote></div>
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