Quote:
In road vehicle aerodynamics, we must consider the 'form' of the vehicle's body, 'above' and 'below' the ground, in mirror image ground reflection, as it would appear in free flight.
Combining to two provides what the air 'sees.' We drive the 'right-side-up' version, while the air also sees the 'upside-down version.' ( this is built into the code of all CFD software ).
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I don't pretend to understand this, but here's an illustration.
And here're two more hightops, my favorite is the Swedish military one:
