Re: NACA ducts - how do they work?

"Nigel Marston" wrote:
> Chap says they can be
> used to inlet or expelling air depending upon which way they are
> oriented. So they could be used pointing backwards to expel air from the
> engine bay in place of the louvres.

They are a lot less efficient in that scenario though, you'd do just as
well with a square flap of the same size.  A CF NACA duct will look a lot
nicer though :)
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