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Best practice in aircraft is to have the shutters on the outlet, instead of the inlet.
A gurney flap needs air velocity (I suspect) and that with the turbulence would make it ineffectual. A vent, though, could work there — and it could be a stove-pipe vent, one of those circles with three sectors open so a 60° rotation opens and closes it, without fighting the air flow.
The control logic though? Is the actuator pulse width modulated or trimmed?
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