Spoilers

    Rear spoilers are not usually integrated with body parts，unless small size and theirshape allow integration; usually rear spoilers are add-on devices，fitted to the body mainlyfor aerodynamic purposes. In many cases，mostly when mounted at the rear end of theroof or on the liftgate upper cross-member, the aerodynamics task is mixed with theintention to create a sporty image and the requirement to protect rear passenger area fromsun rays.

    Rear spoilers have this property; their shape can change the air flow in such a way soas to generate a down force and their position, behind rear wheels, has a leverage factorwith a relevant change in lift distribution between the front and rear axles. To balance thepitching moment that affects front wheels adherence and to lower overall lift，the front endshape should also be changed.  In practice, as already stated, aerodynamic add-onconfigurations should be defined and optimized interactively and concurrently in order tobalance the overall body behavior.