Re: RE: NACA ducts - how do they work?

26/10/2003 23:36:31, "Nigel Marston" <[email protected]> 
wrote:

>I also posted this to BC (for a wider audience). 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.

Yeah, but I don't think they do anything magical in the 'eject' 
direction like they do in the 'ingest'. It's hard to see how they're 
anything better than pretty-shaped holes, and a slanted pipe end, 
cut flush with the skin, would be no better or worse. If your chap 
has data, I'd be interested to see it. 
(F1 chappies seem to terminate their exhausts either in cut 
slanted pipes, or chimneys to punch holes in the airstream, into 
which the exhaust is expelled / sucked - no sign of our NACA 
friends)

Steve
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