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Originally Posted by ecomodded
Quote:aerohead
*Since the Beetle has no 'boot',there's really nothing to reattach to.
*Without the 'reattachment',any pressure gain you might get from the VGs are eaten away at by the constant increase in interference drag and induced drag of the vorticity they produce.Gains could be 'negative.'
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With the Beetle i have thought that the best place for a rear spoiler is not at the bottom of the glass where it is in stock configuration when mounted,
but at the bottom of the hatch itself, on the top of the bumper/ license plate indent about 24" below the rear glass.
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If you can find the thread for the aero-modded Chrysler Airflow,you can see what Carl Breer would have done to your car.It was actually the world's first K-form car.
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I bet he would boat tail it and but good.
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Professor Hucho refers to your car as a Pseudo-Jaray form.The rear is too fast for attached flow.Even if Flow Illustrator was accurately depicting the Beetles flow(and it is not),it would only be at the centerline and would not indicate the longitudinal vortices attached on each side which is killing your MPG.
Hucho would go on to tell you that so far,nothing which works on aircraft has demonstrated like efficacy in ground proximity on an automobile.There is no well of free-flowing air below the car.
Propellers and struts are 2-dimensional flow devices and their dynamics are not germane to automotive aerodynamics investigations.
The Beetle violates the 115-degree rule of boundary layer flow attachment.Unless you relax that curvature,more like VW's latest 1-liter car,you have no chance for meaningful drag reduction.