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Originally Posted by freebeard
Think ........Shuttlecock........
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No, I think these aft rudders are more like the area behind the front wheels of this car below.
https://en.wikipedia.org/wiki/Ferrari_TR
Quote:
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1958 250 Testa Rossa from the Ralph Lauren collection
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However, there is no side of the car body for the air to flow as this is the very back of the car. Somehow it might be taming the turbulence by allowing the air to
pressure plane.
These pressure planes are also called stators when stationed after a fan or propeller to uncurve the twisting thrust.
http://www.slipstreamhover.com/LIKE_...3hovertrek.htm
In the above only one set of those blades move, the stators are fixed in place and are after the fan blades.
Air cooled cars also may use these things.
Alternator Ground Strap - Pelican Parts Technical BBS
There is also something called a "splitter" in hovercraft that can be curved to capture the twisting flow - see picture below.
Neoteric Hovercraft, Inc.
The air twisting off those huge rear wheels is less destructive and drag causing if straightened out a bit. Maybe those divergent diffuser fences (
fixed rudders) are doing exactly that.
Get yourself a large fan. Place your face or hand behind it and detect the air coming off. It will be in a twisting motion, even more evident without a safety grille, don't blame me if you get hurt. Just be careful, and don't wear a tie or loose clothing.
Anything spinning will leave a pattern of swirling air in it's wake, even tires.