squircle
The squircle would be real good.So many production vehicles already have a body section like that.
Jaray's was like it in the center of his pumpkin seed.
The FKFS K-cars were like it for the same reasons you mention.
As long as the contours are gentle the boundary layer will be protected.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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