View Single Post
Old 04-18-2008, 03:50 PM   #63 (permalink)
Otto
Master EcoModder
 
Join Date: Mar 2008
Location: USA
Posts: 568
Thanks: 1
Thanked 73 Times in 58 Posts
Quote:
Originally Posted by LostCause View Post
... If the road was static, then I could understand that interference might exist...but that's not reality....LostCause
All of the roads that I drive on are static.

Air trapped under the car will try and escape, but the rougher the underbody is, the more obstructions there are, and more circuitous route to escape.

Reduce the amount of air trapped under the car and/or smooth the path that such air must take. In other words, make it as effortless as possible on the air molecules.

The less disturbance of the air, and/or straighter path that it takes from front to back, the less drag and greater efficiency.

See MacReady et al.

It would be interesting to do tuft tests on a roadway surface, and videotape them as the car drove over at ~70 mph.
  Reply With Quote