Sort of depends what you consider an air foil, Tony.  Wish there were simply
answers to you question, but the fact is that any cooling system is the
total sum of the performance of ALL the elements in the system.  Air flow is
one of the important factors.

Whenever  you want to minimize drag and maximize use of the subsonic air
flow, smooth rounded surfaces for the air to flow over generally is desired.
Sharp, abrupt changes to surface or cross sectional area generally impede
the desire results.

So to answer your question, it is generally desirable to have a smooth
rounded (air foil?) shape to the duct inlet to reduce turbulence and
boundary layer separation.  However, that is just a good start, many more
factors to consider.

Ed Anderson

Rv-6A N494BW Rotary Powered

Matthews, NC

eanderson@carolina.rr.com

http://www.andersonee.com

http://www.dmack.net/mazda/index.html

http://www.flyrotary.com/

http://members.cox.net/rogersda/rotary/configs.htm#N494BW

http://www.rotaryaviation.com/Rotorhead%20Truth.htm


-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of tonyslongez@cox.net
Sent: Tuesday, January 12, 2010 11:52 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Scoops

can anyone shed some light? Is there an airfoil that makes up the scoop? and
if so can we use different airfoils to get the desired cooling results say
in a climb or unusual attitude. In other words can you stall the air going
into the scoop. Or am I way off base here?


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