Client: KARBONIUS Composites


Rear Wing Design

Design of double step rear wing made of carbon fiber, with regulation system and aluminium light weight pillars.

The selection of the optimum aerodynamic profile and the choice of the ideal proportions of the flap respect to the main stage were the first phases of the project.


The aesthetic design is characterized by the curvature of the spoiler.

Instead of being an extrusion, like most of those available in the market, a sweep was made, so that it gave it character and an aesthetic that differentiated it from the other ailerons.

Phases developed in the project

Although it is a piece whose objective is to improve the aerodynamic behavior of the car, the aesthetic design cannot be ignored. A sporty, aggressive, but at the same time elegant appearance was sought.

It was decided to make a two-stage spoiler, to make it more efficient; make it curved, to follow the trunk line of the car; design lightened aluminum pillars and a regulation system that allows changing the angle of attack depending on the conditions.

Being an aerodynamic component, this phase takes great importance. The first is to select the optimal aerodynamic profile, for this a tool based on the Xfoil code was used. One of the client’s requirements was to maintain the possibility of manufacturing the spoiler with a single stage, so the first stage could not be small, since it would give off too much. Once the first stage is dimensioned, its angle with respect to the horizontal one, the angle of the second stage (flap) relative to the first stage, the superposition of the flap on the main stage (overlap) and the gap between the two stages should be determined. (gap)

Thanks to the fluid dynamic simulation, in this case in 2D, the optimum range of the angle of the main stage was determined, one of the ends of the range being the maximum efficiency and the other the maximum negative lift. These first simulations were performed as if the wing was an isolated element, however, the reality is that it is anchored to the car, so the possibility of doing a 2D simulation including the car profile was raised, which allowed us to know the air with which the air strikes the spoiler.

It was only necessary to define the lamination for the manufacture of the spoiler. For this, we took into account the materials that our client, Karbonius Composites, usually uses, in this case pre-impregnated carbon (prepreg).

Using the simulation again, we determine the lamination, and the reinforcements necessary to obtain a light but rigid spoiler.

Project images