I made mine by trial and error, recutting and adjusting them until they pushed the air over my head and (on one bike) stopped the top of the screen whistling from air passing over it, bottle top style. Not as pretty as commercial deflectors but then neither are the bikes they're on.
Without them air from the sub eye line screens hits me straight in the face. The screen on my GoldWing is higher than my eye line and deflects all the air straight over my head on its own, but it doesn't take much in the way of dirt / insects / rain (or a combination of them) to make the screen too dirty to see through. The screen is an higher aftermarket addition but given a choice I'd prefer a lower one with a deflector.
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