Quote:
Originally Posted by California98Civic
Interesting. Thanks. How might the vacuum help? Wouldn't a downward spoiler reduce the wake by taking the attached flow I know is coming down the window and sending it into the wake area? Wouldn't that reduce the wake area? Does that make sense?
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Ill let the experts take the floor on the question about the vacuum pressure being good or bad.
I was
guessing based on a comment from an aero engineer that worked on the UCLA Future Car over a decade ago. The link is dead now, but there was a PDF write up about a partial boat-tail that was created for the car. At the tail end a section was hollowed out - the reason being that it created a bit of vacuum pressure at the tail end and pulled the wake in farther.
As far as having a downward slope to the extention, it might not do a thing, but i can't help but think of the back end of the dodge ESX-3 ( which had a fantastic Cd in the twenties. ( Note the trunk section )
