Just ban anything remotely wingy. Barge boards, end plates, and all that shit. Define minimum radiuses, component sizes, etc. Make some rule defining the sillhouette in plan and elevations, etc, which basically limits you to a central tub and some wheels, and a flat floor, and give the manufacturers free reign to create any body shape that fits completely inside the profile. If they optimise that aero package then great, but the result should be 70% mechanical grip and only 30% aero.
Just ban anything remotely wingy. Barge boards, end plates, and all that shit. Define minimum radiuses, component sizes, etc. Make some rule defining the sillhouette in plan and elevations, etc, which basically limits you to a central tub and some wheels, and a flat floor, and give the manufacturers free reign to create any body shape that fits completely inside the profile. If they optimise that aero package then great, but the result should be 70% mechanical grip and only 30% aero.