[kropotkin thinks...] - Valencia Test Deep Dive, Part 2: Ground Effect - KTM And Ducati...

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For the past few years, Ducati have been the manufacturer pioneering the direction of development in MotoGP. Ducati will come up with a new idea, which the other manufacturers will hastily copy, with a greater or lesser degree of success. Holeshot devices, ride-height devices, winglets. The latest example of this are the tail fins, the four winglets sticking up from the tail of the Desmosedici, which have suddenly also sprouted from the tail of the Honda RC213V and the Yamaha M1.

(As an aside, what do these tail winglets do? Riders report they give better stability, especially under braking. They are too tall to be purely vortex generators – which would reduce drag by smoothing the boundary layer of air on the tail. A possible explanation is that they are directing the airflow coming off the rider, the least aerodynamic part of the motorcycle. But they could also be helping to keep the tail of the bike straight under braking once the load disappears from the rear wheel and shifts to the front. But I digress.)