Paul

On other thing. On the side of Dave's Berkut he has a small NACA scoop
which feeds air to the passenger. The air is fed into a tube with an
eyeball vent at the end. We where crusing along about 220knts and I
noticed There wasn't alot of air coming from the vent. I mean it was
an O.K. amount about what a car A/C might put out on high. I unscrewed
the eyeball from the tube and it was like a hurricane coming thru that
tube. I was realy impressed by the velocity and amount of air coming
from such a small NACA scoop. I started thinking (look out) on alot of
these longEZ's they used these massive NACA scoops for cooling. Do they
realy need to be that big? can smaller NACA scoops be used for cooling
radiators to cut down on drag?

Tony

Replace the eyeball with a rad and see what you get.

That is what you will get :)

The inventors of the NACA duct do not recommend them for cooling systems.
I concur. You need a ram air scoop for cooling. Think of air molecules
like a bunch of marbles. Once the NACA duct fills the marbles will
go right on by.

Vents into cockpits can fool you. The static pressure inside a cockpit
can be much lower than ambient pressure.