[NSRCA-discussion] Cooling outrunners

[AtwoodDon at aol.com]

Jim, 
 
I think Rex Lesher modified a True Turn spinner to have 'inlet slits' to  
pull air into the spinner and back thru the motor.  I don't know if there  were 
any tests to indicate if was effective.  Maybe Rex can comment  here.
 
I also believe there are some NASA airflow studies that indicate the area  
around the prop hub and some small amount of the prop as well as the spinner  
create an cone like airflow around that area that basically prevents air from  
entering the spinner slots, etc.
 
Hacker has a fan like attachment on the back of the large outrunners than  
creates a negative pressure area inside the motor and draws air in thru the  
front of the motor for cooling.  there have been some tests retrofitting a  
similar fan on the back of other outrunners with similar success.   Basically a 
trade off in weight for cooling effectiveness.
 
As you know, I run an AXI 5330/F3A with the chin cowl opening ducted to  
divert incoming air upward across the AXI.  It seems to work even on the  hottest 
summer days.  No air from the cheek cowls is ducted toward the  motor, it just 
passes thru toward the ESC and batteries.
 
Don
 
In a message dated 12/15/2006 4:14:26 P.M. Pacific Standard Time,  
joddino at socal.rr.com writes:

It would seem the best way to cool outrunners that have holes in the case  on 
the end that faces the nose ring, would be to bring air in through the  
spinner and through holes in the backplate.  Wondering if anyone has  really 
thought about the optimum design.  I can picture internal vanes  but perhaps cutting 
off the nose of the spinner and leaving a big hole would  be adequate.  
Anyone tried anything like this?
 
Jim  O


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