Todd Carrico wrote:

Paul, I am considering the COZY/AeroCanard with a Rotary and one of
the thoughts I have been playing around with a Variable NACA duct.
Basically the Floor would move.  Sprung open so that in the event of a
failure it would just open all the way.  I am not sure if this will
work.  I don't know if the NACA duct will work this way, but you
might.

I would also have a variable exit duct, but that should be straight
forward.

Todd Carrico

What works better is an intake lip that moves up and down. 
Moving the floor is not as good as the vortex diameter
does not change that much.

PL
 
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