In order to obtain a great vertical force (and, hence, an unavoidably high drag) only when it is needed, a motor-driven and movable rear spoiler was suggested, which increases its angle of attack and/or comes out of its housing only under given conditions. Whether the design of the rear spoiler is good or not is generally evaluated based on the aerodynamic efficiency thereof, namely based on the ratio between the downforce generated by the rear spoiler and the corresponding drag generated by the rear spoiler the greater this ratio, the greater the aerodynamic efficiency, namely the greater the quality of the design of the rear spoiler.įurthermore, the action of the rear spoiler, by increasing the vertical force acting upon the rear wheels, on the one hand, allows for an improvement of performances in driving conditions in which the main need is grip (for example, while braking, during an acceleration and while driving along a bend), but, on the other hand, it worsens performances in driving conditions in which the main need is smoothness (for example, while driving along a straight road, when very high speeds need to be reached or fuel consumptions need to be optimized). Furthermore, the increase in the dimensions of the rear spoiler implies an inevitable increase in weight and size and this often also leads to aesthetic problems indeed, the rear spoiler, for it is an element on the outside of the body, can be very striking, especially if it is large-sized. Namely, the greater the rear spoiler, the greater the downforce (positive effect), but also the greater the drag (negative effect).

The downforce generated by the rear spoiler increases as the dimensions of the rear spoiler increase however, when the dimensions of the rear spoiler increase, the drag generated by the rear spoiler increases as well. In some sports cars, the rear spoiler is replaced by a rear stabilizer, which has the same function as the rear spoiler, but is separate from the body and is connected to the body by means of suitable supports. The rear spoiler is mounted on the third box of the body in three-box cars or on the rear window in two-box cars. In order to increase the vertical force acting upon the rear wheels, on the rear part of the body there generally is a rear spoiler (namely, a “flow deflector”), which, by deflecting the air flow caused by the movement of the car upwards, generates a downforce (namely, a downwards lift force). Modern high-performance cars feature an extreme care of aerodynamics both in order to reduce the drag coefficient (also known as “CX”) and in order to increase the vertical force acting upon the wheels. The invention relates to a car provided with a rear spoiler. 12, 2019, the entire disclosure of which is incorporated herein by reference. This patent application claims priority from Italian patent application no.

Arranged spoiler