Quote:
Originally Posted by aerohead
The base pressure of your wake is determined by the pressure at the line of separation,top,sides,and bottom.
An upper spoiler will do nothing to lower this vacuum behind the tailgate as you've still got 'forward' separation aside,and below it.
Either a proper boat tail or box cavity is the only thing which is capable of any meaningful drag reduction.
Also,the end of the tailgate may already be in the 'ideal' position with respect to the 'roofline.' A comparison to the Aerodynamic Streamlining Template tool at the top of the Aero Forum would tell you where you are now.
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Well that answers that question
Thanks for the knowledge