<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV>Wait a minute. I thought electric power sytems were "plug & play" and nearly "maintenance free". You mean they're NOT??? LOL</DIV>
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<DIV>John Pavlick<BR><BR>--- On <B>Tue, 9/1/09, Richard Strickland <I><pamrich47@hotmail.com></I></B> wrote:<BR></DIV>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid"><BR>From: Richard Strickland <pamrich47@hotmail.com><BR>Subject: Re: [NSRCA-discussion] Hacker Comp overheating<BR>To: "General pattern discussion" <nsrca-discussion@lists.nsrca.org><BR>Date: Tuesday, September 1, 2009, 12:54 PM<BR><BR>
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I have two Comps that I bought used--sent them off to Hacker to be checked as one had a gear problem and the other ran 'hot'. Got them back and one still ran hot. I disassembled and the interior lining had a small wrinkle in it that impeded air flow--I sanded and re-sealed it--and need to test it. Hacker suggested it had gotten very hot along the way to cause the wrinkle and probably lost some magnetism. Even after three or four flights in relatively close succession, the other motor only got into the high 120s--this one got to almost 160. I'll try it, but I think a new rotor is in it's future..,.BTW, they say if it got high enough to de-mag, then the bearings ought to be replaced also...<BR> <BR>Now for the cause of over-heating: The configuration of these motors is a little weird--you would think they would do a front to back air flow as you would normally have positive pressure toward the front of the
motor--but the fan integrated into the gearbox pulls air through the motor from the back where you would hope there would be negative pressure. So it would probably help to duct air to the rear. But it doesn't seem to matter if the motor is OK as it stays reasonably cool with fairly 'normal' ducting. So I suppose flying with weaker batteries, lots of partial throttle under load, immediate successive flights, too much prop, wide open all the time, etc. could contribute to longevity/heating/ demagging issues. I didn't used to pay that much attention to motor temps as my original C50XL14s seemed to run fairly cool--but then I went out for some quick flights for practice--hot, humid and flights in close succession and killed 'em both within a week--I was out of business....<BR>RS<BR> <BR>
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Date: Tue, 1 Sep 2009 12:01:39 -0400<BR>From: schale@optonline.net<BR>To: nsrca-discussion@lists.nsrca.org<BR>Subject: Re: [NSRCA-discussion] Hacker Comp overheating<BR><BR>I called Hacker first person thought it was the phenolic disk from the fan being missing. Next guy who was to take the order was less enthusiastic. He thought it could have been a de magnetized issue. Oh well off to Hacker it goes :)<BR>I haven't flown the Pinnacle in over a year, guess it is time to get re-aquainted.<BR>Thanks for the help.<BR>Stuart<BR><BR>Richard Strickland wrote:
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There's a pretty good chance the rotor has de-magnetized, draws more amps to compensate and heats it up. Rotor is about $180.00. Make sure the interior paper isn't rubbing the rotor and there is <EM>some </EM>clearance--as there ain't much to start with...<BR>RS<BR> <BR>
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Date: Mon, 31 Aug 2009 22:51:15 -0400<BR>From: <A class=EC_moz-txt-link-abbreviated href="http://us.mc805.mail.yahoo.com/mc/compose?to=schale@optonline.net" target=_blank rel=nofollow ymailto="mailto:schale@optonline.net">schale@optonline.net</A><BR>To: <A class=EC_moz-txt-link-abbreviated href="http://us.mc805.mail.yahoo.com/mc/compose?to=nsrca-discussion@lists.nsrca.org" target=_blank rel=nofollow ymailto="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</A><BR>Subject: Re: [NSRCA-discussion] Hacker Comp overheating<BR><BR>The pencil line is straight, and it is a kevlar wound magnet. I will call Hacker tomorrow and I am sure they will say send it in. The input wire could be an issue. I always noticed that if the wires were bent wrong it would cause friction to keep the motor from easily spinning.<BR>I guess I will just have to fly the Pinnacle for a while, or switch that motor to my Beryll. Does the reg
Hacker swap for the comp model or are spacings different?<BR><BR>Earl Haury wrote:
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<DIV><FONT face=Arial>Stuart</FONT></DIV>
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<DIV><FONT face=Arial>As this is a change from the norm, it's apparent that something has changed with the motor. Higher temp is usually associated with higher load (more watts) which doesn't appear to be the case. A clue might be in the missing fan disc, I doubt that the change in fan efficiency is at fault due to the rapid temp rise. But, you might check the windings for damage from debris, as clearances are close between the rotor and the windings. <FONT face=Arial>You mention that the rotor doesn't have separated magnets. I assume that this rotor has the Kevlar thread outer winding. There's usually a pencil line drawn on the covering for the length of the rotor - ensure that the line is straight. If some magnet discs "slip" they may not develop a gap, but the pencil line will be discontinuous.</FONT> (Although usually slipped disc symptoms are higher amps as well as temp.)</FONT></DIV>
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<DIV><FONT face=Arial>Another possibility is a partially broken motor input wire, the high resistance in one "phase" will imbalance the load on the windings and quickly generate more heat. (I've found it worthwhile to tie the motor wires together to minimize flexing.)</FONT></DIV>
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<DIV><FONT face=Arial>Good luck</FONT></DIV>
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<DIV><FONT face=Arial>Ear</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="BACKGROUND: rgb(228,228,228) 0% 50%; FONT: 10pt arial"><B>From:</B> <A title=schale@optonline.net href="http://us.mc805.mail.yahoo.com/mc/compose?to=schale@optonline.net" target=_blank rel=nofollow ymailto="mailto:schale@optonline.net">Stuart Chale</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=nsrca-discussion@lists.nsrca.org href="http://us.mc805.mail.yahoo.com/mc/compose?to=nsrca-discussion@lists.nsrca.org" target=_blank rel=nofollow ymailto="mailto:nsrca-discussion@lists.nsrca.org">General pattern discussion</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, August 31, 2009 8:41 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Hacker Comp overheating</DIV>
<DIV><BR></DIV>It has been in the same plane for 2 years. Never noticed it getting this hot before. I know the last time I checked (in hotter weather) it was not this hot.<BR>Stuart<BR><BR>Vicente "Vince" Bortone wrote:
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<DIV style="FONT-SIZE: 12pt; COLOR: rgb(0,0,0); FONT-FAMILY: Arial">Stuart,<BR> <BR>How long you have been running the motor? Did you measure the temperature? It will be good idea to duct air to the back of the motor. If you don't have any ducting I suggest that you install some. Air from the duct should blow as close as possible to the motor. Probably you already did all this but I am not sure. Also need to make sure that has enough exhaust opening to allow the hot air to exhaust the fuselage. I am sure that you will get more suggestions.<BR> <BR>Good luck,<BR><BR>Vicente "Vince" Bortone<BR><BR>----- Original Message -----<BR>From: "Stuart Chale" <A class=EC_EC_moz-txt-link-rfc2396E href="http://us.mc805.mail.yahoo.com/mc/compose?to=schale@optonline.net" target=_blank rel=nofollow ymailto="mailto:schale@optonline.net"><schale@optonline.net></A><BR>To: "General pattern discussion" <A
class=EC_EC_moz-txt-link-rfc2396E href="http://us.mc805.mail.yahoo.com/mc/compose?to=nsrca-discussion@lists.nsrca.org" target=_blank rel=nofollow ymailto="mailto:nsrca-discussion@lists.nsrca.org"><nsrca-discussion@lists.nsrca.org></A><BR>Sent: Monday, August 31, 2009 7:13:08 PM GMT -06:00 US/Canada Central<BR>Subject: [NSRCA-discussion] Hacker Comp overheating<BR><BR>I have a hacker 14XL Comp model that started overheating this weekend. <BR>I was hoping it just needed some grease. Pulled it apart tonight and <BR>grease was still present (black as usual. Regreasing time was near.) <BR>Cleaned it up and pulled the front housing off. First thing I noticed <BR>was that the bottom portion of the fan (the phenolic disk) was missing. <BR>Some dust in the motor so I think it just got chewed up spit out or part <BR>of it ground to dust. Pulled the rotor and the magnet looks fine. I <BR>had a standard model where
the magnet split part way down and was <BR>pulling higher amps. Bearings fit the shaft freely, no play but slid on <BR>easily and seemed smooth. Put it back together regreased. Ran it up <BR>with a 21 x 13W APC pulled 67 amps 2300 watts at WOT but after a minute <BR>or so of 3 15 to 20 second full throttle bursts the motor was hot <BR>again. Too hot to hold your hand around it.<BR><BR>Any ideas?<BR>Thanks,<BR>Stuart<BR><BR>_______________________________________________<BR>NSRCA-discussion mailing list<BR><A class=EC_EC_moz-txt-link-abbreviated href="http://us.mc805.mail.yahoo.com/mc/compose?to=NSRCA-discussion@lists.nsrca.org" target=_blank rel=nofollow ymailto="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</A><BR><A class=EC_EC_moz-txt-link-freetext href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion" target=_blank
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