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Hi All,
I think we can all agree that parachutes work. And parachutes do not have air flowing through them.
The front grill of a car , with the grill blocked from behind is a parachute. But, in the overall drag of the car, its not that big a percentage. It takes energy to form the air bubble. Otherwise, skydivers would die.
Letting air flow through the non-aerodynamic spaces of the engine comparment is going to have allot of drag too.
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