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NACA duct has to be done right. They're like the little girl with
the curl "... when they are good, they are very very good, but ..."
You can't make significant (much less radical) departures from the
optimum design or you get very bad results. Vortex generators will
get back most of the performance of minor excursions from optimum
design specs, but don't make large departures from the straight and
narrow.
At least that's what I've been told ... Jim S.
james coffman wrote:
Watch out for naca ducting for cooling. they have a
reputation for not working. Having said that, look at
an article in this months Sport Aviation. I forgot the
plane type, but using the naca duct on an IO-540. It
completely failed in several positions until he added
difusers (sp) in front. Now works fine. There are
pictures. Interesting! Jim Coffman
--- "sqpilot@earthlink" <sqpilot@earthlink.net> wrote:
> Message
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