RE: NACA ducts - how do they work?

Thanks Chris. Think it was your web site HOTBOT pointed to
(http://www.g2.nu/chris/westie/pictures/index.php) for examples. :-)

Ahem... next question then. Can you buy preformed ones in both Ali and
CF? Would you happen to know where as you have obviously picked some up?

> From: Chris Good
> 
> They were designed as shockingly effective ways to suck air in from an
> attached flow without causing measurable amounts of drag.  In the
intended
> installation the pointy bit goes forward and they suck the air in.
They
> can be used inside out/upside down but they're no longer the optimal
> design.
> 
> The exact proportions of them and the shape of the leading edge of the
top
> surface are critical in getting them to work to their best, having
said
> that unless you're trying to get the last few percent of flow out of
them
> they'll work plenty well enough.
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