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freebeard:
--> I'm not really sure what's going on in that diagram...
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You know, I'm not either.
It represents my thinking in the mid-1990s, as an <i>homage</i> to Jim Hall's Chapparal 2J
Chaparral Cars - Wikipedia, the free encyclopedia It used 45 hp to create 1+ Gs of downforce exhausting into the wake. My thought was to exhaust through the top of the car to create an invisible 'spoiler'. I eventually decided it would be a bad idea because if the dynamic suction breaks it could end up like this:
The skirt was supposed to have zero clearance and wear in like a new set of tires. Acting passively, without any fans, if the area of the gap (viewed from the front) is less than the exhaust opening, wouldn't it effect a negative pressure underneath?
And if the internal airflow sucked engine cooling air, it might represent energy savings.
Later, I inclined toward eliminating all that and make the backlight into a hatch over a wire basket that would hold 2 or 3 bags of groceries. 'Cause then I could name it 'Grocery Gitter'.
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I'll try to talk more about sidewalls later, in conjunction with underbodies and front air dams/splitters.
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Looking forward to that.