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Electric Stunt => Gettin all AMP'ed up! => Topic started by: Paul Taylor on May 10, 2014, 12:45:39 PM

Title: Running hot?
Post by: Paul Taylor on May 10, 2014, 12:45:39 PM
After a 5:30 flight my motor was too hot to touch. Is that normal?
Title: Re: Running hot?
Post by: Tim Wescott on May 10, 2014, 01:23:46 PM
No.  Most likely you just don't have enough motor for the plane -- but tell us more.
Title: Re: Running hot?
Post by: Paul Taylor on May 10, 2014, 02:34:31 PM
It's a full size Force. Has a Cobra 2820/14
Close to 600sqs if I had to guess. 56oz.


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Title: Re: Running hot?
Post by: Paul Taylor on May 10, 2014, 02:36:50 PM
(http://img.tapatalk.com/d/14/05/11/3adyge7a.jpg)


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Title: Re: Running hot?
Post by: Tim Wescott on May 10, 2014, 03:18:09 PM
Hey Paul:

Including the picture was great.  It looks to me like you don't have air flow through the motor -- is that the case?  If you think you do, perhaps post some more pictures showing how you're getting air through the motor?

The three ways that I know of that people do this are: make the cowl opening bigger than the spinner (by about 1/8" or 3/16") all the way around, so the air flows past the spinner, through the motor, and out; make a scoop that feeds air into the space between the spinner and the motor; and finally to ventilate the spinner.

A quick test would be to leave the spinner off and go fly -- if that keeps your motor cool, then you know it's a motor cooling issue.
Title: Re: Running hot?
Post by: John Cralley on May 10, 2014, 03:22:16 PM
From your photo I cannot see how you are cooling the motor? Maybe take that spinner off!!

OK, Tim got in ahead of me --- what he says!!
Title: Re: Running hot?
Post by: William DeMauro on May 10, 2014, 04:02:19 PM
Like the others said,I think that motor doesn't have enough airflow through it. Also at 56 ounces you are at about the limit for that motor which also isn't helping you. a cooling duct on the inboard side, if possible might help some too. You can also try adding a fan to your motor. This should help out too.
http://www.rcdude.com/servlet/the-2104/Cobra-C-dsh-28mm-Motor-Cooler/Detail