OK folks for all you people that want to use a NACA duct this MIGHT work.
I call it the NACA trigger. The small electric fan sucks enough air
out of the boundary layer to trigger the flow into the NACA duct.
Sort of a fluidic amplifier. You can turn it off at cruise instead
of using cowl flaps. If it works it could have a large advantage
over the P51 scoop in lower overall aerodynamic  drag because
of the reduction in overall aircraft frontal area and skin friction.
The air from the fan could be routed back to the rad.

Paul Lamar

Ernesto Sanchez wrote:

How about using that hole for the intake of your turbo?
Or the bottom (top?) floor of the drilled with many smaller holes ducted to
the engine intake?
Ernesto

Very good idea Ernesto. One can always jack up the boost slightly to
compensate for the slight dynamic pressure loss on the inlet to the turbo.

Paul Lamar
 
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