Here it is Doc. You could get in a situation
where the air going into the scoop becomes unstable.
This might occur where the engine air requirements and
the forward motion of the air plane supplys just enough
air to keep up with the engine requirements.
Sort of an air direction oscillation. I am not saying
it is going to happen. I am saying it might happen.

You might have to grind off a small piece of the engine
here and there. The scoop sides and bottom could be
an extension of the plenum.
-- 
Paul Lamar ...No rotor no motor.

That looks really cool Paul, But what  happens if I he flys thru
a small rain shower? That goes for all those indy style scoops.
Is that why mistral had theres facing toward the ground?

Tony

Which scoop? The ram air intake, the ramp air intake or the
rad air intake?

If ramp or ram I guess the engine will drink some water along with
the fuel.  You might want to put an alt air supply on it.
Such as the attached 3D. there is no provision in my C182
for rejecting ingested water and I have flown for hours through
heavy rain in south east  Alaska.

It should not hurt the rad. It will leak through. It will
also cool it off real well.

Paul Lamar ...No rotor no motor.

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