Quote:
Originally Posted by The Toecutter
Not exactly. They are claiming:
Welburn said pulling the body out, essentially widening the body where the rear tires are located, increases aerodynamic drag.
To widen the body at the rear to accommodate skirts without making compromises to the rear tires or rear track, would introduce a pressure spike in the turbulent airflow zone. This should add drag in most cases.
If the skirts are flush with the body and don't bulge out, generally they should reduce drag.
For a front drive car, I don't see why they'd be an issue regarding rear tire size or rear track width. Having narrower tires in the rear or a narrower track in the rear shouldn't adversely effect the performance of a front drive car given that the important tires are up front and can be as thick as needed.
For an AWD vehicle, having a rear track more narrow than the front track also isn't much of an issue, especially if the vehicle is electric and has the ability to do near-instantaneous slip detection.
It is rear drive layouts where they can be problematic. BUT if you design both front and rear track to be sufficiently narrow that both front and rear wheel skirts can be accommodated, then this shouldn't be an issue either.
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My rear wheel skirts buldge out though, like little bubbles. But they maintain attached air flow