Quote:
Originally Posted by You Need a Thneed
They aren't dents, they are speed holes. They make the car go faster.
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Yep... same principle as dimples on a golf ball.
As per wikopedia...
...dimples delay separation of the boundary layer from the ball. Early separation, as seen on a smooth sphere, causes significant wake turbulence, the principal cause of drag. The separation delay caused by the dimples therefore reduces this wake turbulence, and hence the drag.