Sunwapta, I'm surprised you haven't gotten any replies so far!
I was thinking along similar lines for an air dam on a larger car. In my case I was thinking of a surface out in front that would be hinged off-center so that at road speeds, air pressure would swivel it into place. At slower speeds it would swing up for more road clearance for parking, etc.
But now that I think of it more, it would have to be double -jointed to be able to move up. Back to the drawing board...
Ray Mac
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