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euromodder,
you may be onto something there. However, given how close to vertical the wingy things are, I don't see them generating a lot of downforce without also generating a lot of drag.
I'm thinking maximum efficiency/minimum drag which suggests to me that the horizontal angle of the chord or fore/aft axis of the wingy things -- OK, vertical stabilizers -- represents the actual airflow over the bodywork at the higher/highest speeds the car could achieve. (This would have been determined in the wind tunnel.)
That would mean that air is moving upwards as it moves along the body, and then inwards at an angle at the back. (I'd love to see a smoke test at simulated top speed.)
So there is a question then of just what was the design goal of the vertical stabilizers. I suppose that in the absence of sufficient downforce, or perhaps too much up force, acting on the back of the car/bodywork, the vertical stabilizers acted like a fixed rudder (and drag brake?) to keep the rear of the car following the front.
It would appear that two widely separated vertical stabilizers introduced a lot of new variables to be dealt with as opposed to one single centerline stabilizer.
So why then two?
One large single one just too reactive to side winds/gusts?
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