ONE GURNEY, PLEASE
On both the RB14 and the FW41 Mexican-style, a “Gurney flap” was added to the end of the engine cover.
This generates a vacuum in its wake, which sucks air escaping from the engine cover. The flow is therefore accelerated, which facilitates its extraction and, therefore, the cooling of the powertrain.
At Mercedes, the fin of the engine cover has been cut and widened in order to expel the hot air (as was the case in Bahrain, Budapest, Singapore, etc.).