I'm sure there's a reason this isn't done, but I don't know what that reason is...
Cladding the entire a-arm on a car with essentially the same inboard pickup point altitude (no antis). That is, fill in the triangle between the front and rear pu points and the ball joints with a light strong material, making the a-arm a great big filled in area -- and a kind of symetrical wing...
On chassis dive, you'd get a downward slope of the triangle and some crude, turbulent downforce. On squat, the opposite... which, in a lower power car could be neat...
I know there are sanctions against building in an a-arm that acts as an aero device (by causing it to angle up and down)... but this wouldn't be that. It's just be filling in the natrual-born A in the a-arm and just using the chassis dynamic pitch to do the rest.
Started thinking about this when I found myself wondering if the filled-in triangle wouldn't produce less drag than the usual two tube arangement (with its two wakes; and the associated aero mayhem that comes with it, etc).
Anyway, I know people have doubtlessly run this through their brains... but I wondered if anyone in the history of the world anyone has actually tried it, measured it and etc?
Chris