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<DIV><FONT face=Arial>Stuart</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<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>
<DIV><FONT face=Arial></FONT> </DIV>
<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>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Good luck</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Ear</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=schale@optonline.net href="mailto:schale@optonline.net">Stuart
Chale</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="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-FAMILY: Arial; COLOR: rgb(0,0,0); FONT-SIZE: 12pt">
<P>Stuart,</P>
<P> </P>
<P>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.</P>
<P> </P>
<P>Good luck,<BR><BR>Vicente "Vince" Bortone<BR><BR>----- Original Message
-----<BR>From: "Stuart Chale" <A class=moz-txt-link-rfc2396E
href="mailto:schale@optonline.net"><schale@optonline.net></A><BR>To:
"General pattern discussion" <A class=moz-txt-link-rfc2396E
href="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
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