Really? Why does this balancing of a 2 D projection work? The force per unit area, or pressure, on a vehicle due to air drag depends on the projected area of the vehicle with a normal anti-parallel to the air velocity vector. It seems for a vehicle with fairly constant height as a function of length if the front of the vehicle is much wider than the rear, it will have much greater pressure than the rear. I don’t see how finding the balance point of a 2 D projection from the vehicle side, or finding the centroid of the area of this projection captures this since it contains no information on width, only length and height. It seems you have to assume the width of the vehicle as a function of length is constant.
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