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Been waiting for this question sort of. Its all about air pressure and aero form.
The mass still pushes through air at varying rate as determined by air density, speed, and resistance. Turbulence is caused by and also creates air pockets that become part of the total mass or follow behind your mass.
Damming frontal air instead of spoiling it effectivly causes vaccume under front of car.
The better approach is to slice through the air if possible distributing compressive force equally about the mass creating as little disturbance as possible.
disturbance and pressure pockets are sorta like parachutes to the aero effect.
I am sure some more educated mathematician here has a formula to determine how much air must be able to clear the bottom of vehicle but im thinking 2:1 would be good since most vehicles are designed for air over effectivly raising ground pressures at tires and reducing true aero.
Ok hows that clear as mud?
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