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This design worked on a Triumph 800 I had. Last time I checked they did not have one for a V7.http://www.madstad.com/
Don't underestimate the design of the helmet in reducing buffeting. Some newer designs of helmets feature anti-buffeting features, the Kabuto helmet I wear greatly reduces buffeting.Relying on windscreen design is difficult because a small change in rider position as you move around on the seat or simply sitting up straighter can impact the benefits of windscreen effects. The helmet remains the constant factor.
Here is what I think I know about air management . Mostly a nice still pocket of air is dependent on equalizing pressure . Proper venting seems to be the key , I experimented with airflow on a BMW airhead RT fairing , winglets , foils , lips , etc . In the end it came down to venting the windshield , had the same results with a police style windshield used on a naked beemer and a Jackal . Take a look at the Pacifica Aerofoil/Swanee/H&H fairing which is the best handlebar mount design ... EVER . The body is vented , as is the shield . Dusty
Parabellum supposedly uses a wind tunnel for design,http://parabellum.com/Search.aspx?k=%20Versys
Airflow isn't always what you think. Airplanes are "tufted" to see what is happening. It's nothing more than pieces of yarn about 3 inches long stuck down with tape. I'm headed out to lunch, but a google search should show it.
www.calsci.com
As you know, the windshield acts like a wing through the relative wind. The idea is to get the flow to "stall or burble" at a point higher than your head.....