Re: How can you lower wind resistance?
Originally Posted by oledoc2u
....................................The flow under the car is faster, and creates downforce. Take a piece of paper, fold each end by a third making 3 sides. Sit it on end as to make a tunnel. Have a little bit of air blowing down on the top, not enough to collapse it, but just enough to hold it down. Then with your mouth, blow into the tunnel and see what happens.
A car at speed is an airfoil, the pressure on top of the car is less and the air under it is greater. This lifts the car, you analogy is upside down. So maybe in Australia your principle works.
The air under the car is faster than the air over it. (sorry ... that's not correct)
Race car designers have worked on the under sides of the cars to get a lower pressure under the car than on top, but normally it is the reverse. The Mercedes car ad in a tunnel, if true, would rely on these forces.
Last edited by onehundred80; Dec 29, 2010 at 08:05 PM.