Quote:
Originally Posted by Tony Raine
compare trying to run down the road holding a 4'x8' sheet of plywood straight up to doing the same with a 4'x8' window screen.
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But... to be less serious, could someone please try this and post video?
I bet the window screen has at least 50% of the resistance of a plywood sheet at high speeds though. Seems like a lot of turbulence would be generated.
The grill blocks on our cars also push air up, over, and around a vehicle that has good aerodynamics. The semi - it doesn't matter where the air goes around - it's not good.