Quote:
Originally Posted by mekanic
I have an idea that might help mostly on cars that have almost flat roof.
here is the idea: take a sheet of lexan or sheet metal and make a bubble top start at the top of the windshield go over the roof and stop at the back window. however in the migddle of the roof have it 4?6? 10? inches off the top of the factory roof. this would extend the angle of the windshield up onto the "new" roof and help the air flow better over that part of the roof?
or has this been tryed and I need to learn more'?
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A flat roof is not an aerodynamic liability,nor flat sides.
As long as there is no flow separation then you're okay.If the front of your vehicle is as good as the 1st-gen VW Golf/Rabbit you're good.
Conventional wisdom is to do NOTHING which would add frontal area.Even a JEEP CJ-5,at Cd 0.8 can be 'fixed' ahead of the A-pillars with no increase in Af along or above the vehicle.
Remember,if the body is raked,with a nose-down configuration,the vehicle may be in an aerodynamic 'attack' mode with a positive pressure gradient against the body all the way back to the backlight header which will guarantee attached flow.That's all you're looking for!
