I actually had that thought also. Sort of feels like the winglets on the end of a wing to reduce the area of high and low pressure.
There is a youtube video out there by Julian Edgar where he did that on the back of a car. He has tested the rear finns on a honda insight.
Quote:
Originally Posted by j-c-c
I question the advantage of increasing the radius in that area, and wonder if more might be gained by adding a small aero fence each side to prevent the side air flow migration up and over to what appears to be almost laminar airflow on the upper surface.
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