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dam
I think this would serve you well.Some of the highest mpg concept cars and highest performance super cars rely on reduced airflow underneath for both drag reduction and stability.Even when they have perfectly smooth underbellys.
Active-suspension is always involved to get it to the Nth-degree,but what you propose sounds good.
Journalists have reported,and authors have claimed,that therer ie a point of diminishing returns,as if the dam is sufficiently low,the added frontal area of it conspires to raise the drag back up.
If you can keep the air from colliding horizontally with the major bits and pieces hanging down,the air underneath will skim below with a clear shot to the rear.Wrapping the airdam around the sides is also beneficial,as you see today with NASCAR.
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