I have never seen a NACA scoop used to vent air
FROM the aircraft BACK into airstreams.
I have reviewed all the NACA papers on scoops
and have never seen this effect described. Please point us to any
reference on the subject.
Respectfully,
Eric
Eric, I have to admit I've never seen this analyzed
on paper however I've seen it in practice and the builder swore by it. He had
extended the edge of the opening back a bit 1/4-3/8" as well as rounded the ramp
into the opening as to smooth the transition. I just took his word for it that
it could be used either way. You've got me thinking now but I see why it
wouldn't work? I guess maybe the converging ramp sides might pre-maturely force
the air out into the slip-stream but other than that.. I guess worst case
scenario is to eliminate the converging ramps. One thing that I would steer
clear of [or at least I will on my a/c] is the shark gill type exits. I have
read somewhere that they are one of the worst types of exits for air.. now where
I read that I don't know.. but I'm going to try and find out. Maybe there are
some other aerodynamics types out there that can help me/us w/
this?
Please don't take what I say as the gospel
truth.. I'm no expert, but I try to learn/know all I can about the
subject.
Jarrett
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