REFLECTOR: Prudhomme Alternate Air

[doug.holub at tx.rr.com]

Good catch. It's funny that so many people have seen those pictures and never noticed that. It looks to me like his flap would only help if a bird got stuck in the NACA.
---- Andy Millin <amillin at sbcglobal.net> wrote: 
> I have been looking at the pictures of Jean Prudhomme's setup.  It is pretty
> impressive.
> 
> Thanks for the link Doug!
> 
> http://www.tvbf.org/gallery/?dir=engines%2Fplenum_jean_prudhomme
> 
> I have a question (of course)
> 
> My understanding of Alernate Air is that it provides the engine with air
> should the filter become clogged with ice, snow or other debris.
> 
> If this is the reason for having it, then it makes sense to me that the
> alternate air port must be AFTER the filter.  Prudhomme's alternate is on
> the same side of the filter as the primary intake.  If the alternate air is
> on the same side as the intake air, wouldn't it be as useless as the
> original intake?  Filter is clogged, the engine can't pull from Prudhomme's
> alternate any more than from the primary...
> 
> Andy
> 
> 
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