After a 5:30 flight my motor was too hot to touch. Is that normal?

It's a full size Force. Has a Cobra 2820/14
Close to 600sqs if I had to guess. 56oz.


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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.

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