[NSRCA-discussion] Cooling outrunners

[Dean Pappas]

Yup, and you want about 1 square inch of inlet,  or just a little bit more.
Dean
 

Dean Pappas 
Sr. Design Engineer 
Kodeos Communications 
111 Corporate Blvd. 
South Plainfield, N.J. 07080 
(908) 222-7817 phone 
(908) 222-2392 fax 
d.pappas at kodeos.com 

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Rcmaster199 at aol.com
Sent: Tuesday, December 19, 2006 10:12 AM
To: nsrca-discussion at lists.nsrca.org
Subject: Re: [NSRCA-discussion] Cooling outrunners


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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