[NSRCA-discussion] Cooling outrunners

[Rcmaster199 at aol.com]

One way this could be done is to allow enough annular room around the 
spinner, completely bypassing the cheeks and chin. You only need about 1/8" annular 
opening. Just use a smaller spinner than needed and fashion the model nose to 
recess the spinner slightly into the annulus. 

I have done that on Temptress (engine powered) with good results.

Use the cheeks and chin to route air to the bats.

MattK

In a message dated 12/19/2006 9:28:10 AM Eastern Standard Time, 
bob at toprudder.com writes:
Chad Northeast <chad at f3acanada.org> wrote:
The problem with a lot of composite fuse models (Twister included) is 
that the inlets in the chin and cheeks are often right at the rear or 
even behind an outrunner.....so ducting toward them is very difficult. 
I have to agree that a proper ducting system is crucial for cooling. I 
use a very simple short radius 90 bend in a peice of depron that pulls 
air in from the chin, I see about a 20C rise in temp without it, other 
than that I dont really do anything special. The motor will operate at 
up to 170F without complaining so as long as its 20-30F below that all 
is good :)

Chad
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