[NSRCA-discussion] Hacker Comp overheating

[Vicente "Vince" Bortone]

How high is the temperature?  Do you have ducting?  I have the same motor for 3 seasons.  Temperature in the back of the motor after one Master schedule or around 8 minutes was reduced at least 30-40 oF adding ducting and exhaust .  If you have many flights in the motor you migh need to send it back for service.  



Vicente "Vince" Bortone 

----- Original Message ----- 
From: "Stuart Chale" <schale at optonline.net> 
To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org> 
Sent: Monday, August 31, 2009 8:41:11 PM GMT -06:00 US/Canada Central 
Subject: Re: [NSRCA-discussion] Hacker Comp overheating 

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. 
Stuart 

Vicente "Vince" Bortone wrote: 




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 at 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 

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