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The design represented by my sketch does not consider the aero effects of angled wheels. The dotted-line wheel demonstrates the area that the deflector must clear to allow the wheel to pivot throughout its steering range—otherwise the wheels would just rip up the deflector or tear it off the car. The lengthwise angle and curve of the deflector will not push air out past the width of the car anymore than the high pressure zone in front of and beneath the car already does. As many others have noted, with citations to proper scientific studies, the airflow that reaches the front tires does so somewhat diagonally rather than head on, so the deflector is designed in a NACA airfoil shape to directly face the airflow in order to minimize the drag it's frontal area creates, and also gently 'bend' it to parallel with the length of the car in order to aid smooth flow underneath the full length of the car and between the underside and sides of the car body.
Some seem to misunderstand what we are saying about the angle of the airflow underneath the front of the car, so to put it another way, if I'm the airflow, the frontal area of the tires that I 'see' is not from directly ahead of the car but from something more like a 30-45 degree view.
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