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So why is it then, that we put things like vortex generators at the back of the car?
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Whomever is doing that is placing them blindly
To function properly, they need to be placed just before the transition zone... Where's that? Well, it varies from car to car and varies by speed etc. etc. - it's the million dollar question (with no money to be won!
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The better question - why do we place them anywhere at all? It's a bandaid...
but, aerohead is right.... Golfballs and airplanes are good for explaining concepts... But gold balls are way smaller than cars and move much faster.... Planes are much larger than cars and move much faster.... Planes are also, generally, considered streamlined while cars are, generally, bluff bodies... Comparisons are a slippery slope in a best case scenario :/