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Originally Posted by SlideWRX
On wings (planes or race cars), side plates effectively extend the wingspan
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On aircraft, they are used to eliminate spanwise flow which reduces wing efficiency.
Basically, they keep the air where the designer/engineer wants it - in this case on the most aerodynamically efficient path on the vehicle.
Check out the Ford Bonneville car : it also has strakes on the roof and in front of the extended tailplate on the trunk, while the rear window sits slightly deeper, also creating a fence on the sides.
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I wonder how much benefit one can get from a stepped down boat tail versus a regular boat tail. Better visibility out the rear window, methinks.
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If the angle of the rear window isn't too large and abrupt, just boat-tailing the trunk area will most likely do the trick.