Quote:
Originally Posted by freebeard
The roofline appears unaltered to the B-pillar. So frontal area is unchanged. The shooting brake roofline has a reverse camber that will allow reattachment of incipient separation.
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He has a valid observation, we just need to find the proper language for it.
Frontal area is similar to cross-sectional area, yes?
What is the area at the stern called, the hole in the air which is leftover?
Isn't that called the "
virtual tail area" or something like that?
Area of a "truncated foil"?
But the car is not a perfect foil, the tangent lines can be all over the place, and in a 3D vortex generator style of differing pressures, not strictly a 2D sectional observation without termination ends (
wing tips).
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On a boat this area might be called a
"transom board area".
http://newboatbuilders.com/pages/hp.html
Although, if we were talking non-planing hulls, it would be the area below the waterline at the stern/transom that we would be most concerned with, right?
Again, my earlier argument was that the vectors or direction of the air leaving the end of the car is just as important as the rear area it's self.
Extreme examples are a too steep of a fastback, and flat across semi-truck trailer without aero-devices attached.