Quote:
Originally Posted by Christ
So you're saying that those holes produce negative lift?
I'm relatively sure they don't produce anything, actually, rather negating positive lift that would normally be occurring due to the parachute effect. The notion still stands that the parachute effect wouldn't be a problem if the offending area were covered by body work, hence the obvious advantage of a rear belly pan, or the option to just cut the offending section of the rear bumper, rather than add the ineptly named "speed holes" to it.
If that wasn't your complaint, I'm not sure where the relevance was.
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What you are basically saying is that a hatchback isn't more aerodynamic than a wagon. The plain rear belly pan would be like the wagon, and cutting the lower edge or making holes (big enough holes) would be like the hatchback or adding a boattail. Air doesn't care whether it's flowing past the top or the bottom of a car.