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You are correct, Ernest, the conclusion (as best I recall it) in the NACA report basically stated the velocity inside the cowl was not sufficient to generate the NACA edge vortex swirl which makes the duct so efficient. I'll see if I can find the Naca report number
Ed
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
----- Original Message ----- From: "Ernest Christley" <echristley@nc.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, March 10, 2006 4:37 PM
Subject: [FlyRotary] Re: NACA's, Cooling and Sport Aviation Mag..
James wrote:
Ernest, I did not see that specific paper. Do you know an easy to find it? Thanks.
Regards; James Freeman
Ernest Christley wrote:
James wrote:
Second point: I believe that a reversed direction NACA scoop would make an excellent low drag exit port for the cooling air stream. If anyone tries it, please let us know your findings.
According to the article, NACA tried it. It didn't work very well. A straight sided 'boxy' exit works much better.
The Sport Aviation article referred to it. I took the author's word for it because I seem to recall having read such a paper before. I would have to search the NACA site to find it again.
-- ,|"|"|, Ernest Christley |
----===<{{(oQo)}}>===---- Dyke Delta Builder |
o| d |o www.ernest.isa-geek.org |
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