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Originally Posted by aerohead
I can't imagine any self-respecting aerodynamicist who wouldn't caution against making generalized statements about streamlining.
Every vehicle will have discreet architecturally specific differences than other vehicles and each should be approached on a case-specific basis as has already been mentioned by others earlier in the thread.
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My statement isn't about streamlining, it's about the effect of the distance between road surface and bottom of a parallel surface on pure shear forces (and that these shear forces wouldn't be substantial, since it is not practical to lower the car to a point, where these shear forces would start to play a significant role).
Maybe there are other detrimental effects than increased shear forces which may start to play a role when lowering a car.
Can you show any data that shows that lowering a passenger car has increased aerodynamic resistance?