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Thanks Bill & Chris,
I don't have the equipment handy to measure pressures, but this gives
me a good idea. I don't live in Vegas like the original owner did - I
can simply try sealing the NACA duct. That may resolve the issue.
Thanks to all who responded,
Bill Reister
N351E
Bill Bradburry wrote:
You could try putting a couple of vortex
generators in front of the
NACA scoop to trip the boundary layer.
Bill B
From: Lancair Mailing List
[mailto:lml@lancaironline.net] On
Behalf Of Chris Zavatson
Sent: Saturday, March
28, 2009
9:36 PM
To:
lml@lancaironline.net
Subject: [LML] Re:
Poor
Slow-flight Cooling
The air coming in from
your 3 inch duct may actually be
leaving through the NACA scoop during slow flight. NACA
scoops are somewhat sensitive to orientation to the airstream and while
in
slow flight the orientation may be off far enough that the NACA scoop
is no
longer effective. Two parallel sources will fight each other if the
pressures aren't well balanced. In this case, if the NACA scoop
pressure
drops all of a sudden, you would see a flow reversal.
If you measure the
pressure ahead of the cooler as you
slow down, you should be able to see this transition occur.
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