Quote:
Originally Posted by Frank Lee
Credentials? Backing data?
|
It's just the physics of aerodynamics itself. Drag is the force of the vehicle acting on the air that it's travelling through. The resistance of the grill is presented at the grill. Think about a small grill vs a big grill on the same car. Which grill creates less drag? The small one, even though the radiator behind it is identical, because smaller volume of air can flow more easily into it. Blocking the radiator behind that small grill can't physically reduce the grill's drag, because it makes it 100% opaque to flow instead of 50% opaque or whatever.
Metro, you're right that the air exiting the vehicle underneath affects drag, but I don't think we have any reason to believe it's negative. It could be positive if it pushes the airstream out from the rough stuff.