|In order obtain
genuine data on wing endplate effects, CFD analyses have been
Calculations were done for a wing with and without endplates. With
attached to the wing, the lift increased by 7%, whereas the total drag
increased by 1.4%. This increase is mainly due to the increased
Next, flat endplates with a height-to-span-ratio of h/b = 0.083 were attached:
Figure 2: Pressure distribution on a rear wing with endplates.
changes in aerodynamic coefficients
Applying small endplates will thus result in an increase in the lift generated by the wing by 7 %. The total drag of the wing + endplates has increased by 1.4 %. This is primarily due to an increase of skin friction drag, which has increased by 34 %. The decrease in ‘rest drag’ (pressure drag and induced drag) partially makes up the increase in friction drag, which is just 9% of the total drag in the case of a wing + endplates.
When applying larger, full depth endplates, these endplates will have to be matched properly with the flow around the rear of the car. Simply extending the endplates will cause excessive drag, which can be reduced by means or applying twist to the endplates. This analysis was not done, as the endplate geometry will highly depend on the geometry of the car to which it is applied.