Quote:
Originally Posted by cRiPpLe_rOoStEr
It will depend mostly on the shape and inclination of the windscreen, but it's still most often way more efficient than having no windscreen at all. Even if the windscreen is a little more upright, like you'll be more likely to see on a Harley, if it's quite curved, may deflect better the air than the rider's torso would when directly exposed to the air flow.
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My thinking was a rider has to be completely a high drag obstruction, and a small to medium windscreen might deflect enough air smoothly to lower the total overall drag, even by adding some drag of its own, ideally there would be a sweetspot, but I'm not reading that so far with these replies.