View Single Post
Old 10-24-2009, 04:53 PM   #21 (permalink)
Master EcoModder
aerohead's Avatar
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 15,556
Thanks: 23,672
Thanked 7,038 Times in 4,513 Posts

I'm glad they did the test but I would take them to task for it.The only reason dimples are on golfballs is to hasten the transition to turbulent boundary layer an it's attendant lower Cd (profile drag/pressure drag).
Automobiles,given their size, transition to turbulent boundary layer and constant Cd around 20-mph,so it's not an issue for cars.And the "roughness" of "smooth" paint is all that's necessary for the transition.
I get a kick out of the show but sometimes I wonder if those folks ever pick up books and look at them.

  Reply With Quote