Quote:
Originally Posted by AnTyx
Sorry, should've elaborated: out of the flow of turbulent air disturbed by the passage of the bits of the bike in front of you. The helmet traveling on its own through otherwise still air is, apparently, really not very turbulent at all.
(Compare riding with nobody in front of you to being stuck behind a lorry.)
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When you're following a lorry you're sitting in a pocket of moving air being dragged along by it, so naturally there is less wind noise. What makes the noise is the shearing action between moving and static air, typically as the air stream going past your helmet meets the non moving air inside it. So unless you've got a real "barn door" fairing that deflects all the airflow over your head, your helmet will be in some kind of moving air.
Personally the only advantage I find with screens is they keep some of the wind load off your upper body, avoiding the "sheet in the wind" effect at speed.
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