REFLECTOR: NACA Outlet
Dave Philipsen
velocity at davebiz.com
Tue Jul 1 00:46:39 CDT 2008
There was a good seminar at Oshkosh last year by Terry Schubert and Gary
Hertzler regarding cooling, scoops, etc. They both have much experience
in cooling and drag reduction. The seminar stated that NACA scoops do
NOT make good outlets. They also stated that outlets should not be
perpendicular to the airflow because of excessive drag. In fact, they
even stated that a NACA scoop, while very efficient for some things, is
not the best idea for oil coolers. The seminar mentioned that
Velocities get away with the NACA inlet for oil coolers because the
scoop is usually in a high-pressure environment and the air is forced in
by brute force.
I am not saying that the NACA scoop is wrong but these guys are
considered the gurus when it comes to this stuff. I believe they have
both set fuel efficiency records in their Long-EZs of which they each
have 3000+ hours in type. I can send you the zip file containing the
seminar in Power Point and MP3 format if you like. Your mail server
would have to be able to accept a fairly large attachment though.
Dave
Jack Prock wrote:
> I know a NACA scoop inlet is the best for least resistance for an inlet, I
> am wondering what the best way
> is to have an outlet. I am building the oil cooler in the nose and making
> the outlet on the bottom of the fuselage.
> Is there a NACA outlet? Is it best to just have a rear facing pipe? Or a
> hole in the fuselage that air get pumped out?
> Does it matter? I would think that any air flow perturbations would cause
> drag? Anyone have any thoughts on this?
>
> Jack Prock
>
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