SCHUBERTH C5 CARBON Gebrauchsanweisung Seite 60

C. THE HELMET
Note:
With faired motorcycles, strong currents occur at the edges of the wind
shadow. These may significantly reduce the aeroacoustic performance
of the helmet. The motorcycle fairing should be adjusted so that the
turbulence created does not reach the bottom surface of the helmet.
Turbulators
The patented turbulators on the top of the visor also optimise
the aeroacoustic properties when riding and
prevent acoustic disturbances in the form of whistling
sounds that can be created by smooth and straight
edges.
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aeroacoustically non-critical area
aeroacoustically critical area
aeroacoustically non-critical area