[NSRCA-discussion] Hacker Comp overheating

[Vicente "Vince" Bortone]

Stuart, 



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. 



Good luck, 

Vicente "Vince" Bortone 

----- Original Message ----- 
From: "Stuart Chale " < schale @ optonline .net> 
To: "General pattern discussion" < nsrca -discussion at lists. nsrca .org> 
Sent: Monday, August 31, 2009 7:13:08 PM GMT -06:00 US/Canada Central 
Subject: [NSRCA-discussion] Hacker Comp overheating 

I have a hacker 14XL Comp model that started overheating this weekend. 
I was hoping it just needed some grease.  Pulled it apart tonight and 
grease was still present (black as usual.   Regreasing time was near.)   
Cleaned it up and pulled the front housing off.  First thing I noticed 
was that the bottom portion of the fan (the phenolic disk) was missing.   
Some dust in the motor so I think it just got chewed up spit out or part 
of it ground to dust.  Pulled the rotor and the magnet looks fine.  I 
had a standard model where the magnet split part way down and was 
pulling higher amps.  Bearings fit the shaft freely, no play but slid on 
easily and seemed smooth.  Put it back together regreased .  Ran it up 
with a 21 x 13W APC pulled 67 amps 2300 watts at WOT but after a minute 
or so of 3 15 to 20 second full throttle bursts the motor was hot 
again.  Too hot to hold your hand around it. 

Any ideas? 
Thanks, 
Stuart 

_______________________________________________ 
NSRCA-discussion mailing list 
NSRCA-discussion at lists. nsrca .org 
http ://lists. nsrca .org/mailman/ listinfo / nsrca -discussion 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20090901/bcadb92e/attachment.html>