In case of side winds with an angle of attack up to 20 degrees, the yaw moment increases almost linearly. The notchback form leads, among other full tail profiles, with the highest and the lowest yawing moment owing to side winds, as shown in the figure. A small side force at the rear corresponds to a large yaw moment, while a large side force at the rear corresponds to a small yaw moment. Rounding the frontal profile of a car increases the yaw moment as it leads to an increased negative pressure at the leeward side of the nose. On the other hand rounding the side edges of the hood as well as rounding the A-pillars cause a reduction in the side force at the front and thus the yaw moment. At the tail, any rounding on the lateral surface leads to a reduction in the side force at the rear and this in turn brings about an increase in the yaw moment. The inclination of the side windows however, does not have a large influence on the yaw moment. With an increasing angle of inclination a reduced total side force results.
The rolling moment is reduced by an inclination of the side windows. The full tail form indicates the highest rolling moment, while the notchback form, the smallest. Rounding the sharp edges in profile detailing can reduce the rolling moment. But rounding only at the lower edge of the nose increases the rolling moment.