GrahamNZ
High Miler
20001200c
A while back I had a touring bike with a screen which allowed no helmet turbulence and no bugs on the visor. That may sound like I too had found the strawberry jam jar. Party, yes, but there were downsides. In really hot weather I had to ride with the visor partly open or I was stifled, because the lack of "clean air" over the helmet was insufficient to allow the helmet's inbuilt ventilation system to work properly. In rain I had to move my head to the side of the screen area every few minutes to get enough airflow over my visor to blow away the rain drops on it. A fool's paradise?
Laminar-flow screens are ones where air is introduced at the bottom, usually through a slot or gap, in such a way as to cause the airflow to flow up inside the screen surface and continue on an upward path after leaving the top, hopefully then clearing the rider's head. Deflector-screens hope for the same end result by simply turning the airflow upwards on the outside of the screen. Some screens employ both systems, but the one shown in this thread is more of a deflector type. Still looks good to me though.
Recently I increased the gap at the bottom of the modified Givi A620 screen on my Buell to introduce a laminar-flow system. And it does seem to have worked. The stock front nacelle is pretty upright and acts to deflect air upwards anyway, and that made the screen mounted above and partly overlapping it a good candidate for laminar-flow to work. Some bugs? Yes. Good visibility in rain? Yes. Good helmet ventilation? Yes. Good looking?............
A while back I had a touring bike with a screen which allowed no helmet turbulence and no bugs on the visor. That may sound like I too had found the strawberry jam jar. Party, yes, but there were downsides. In really hot weather I had to ride with the visor partly open or I was stifled, because the lack of "clean air" over the helmet was insufficient to allow the helmet's inbuilt ventilation system to work properly. In rain I had to move my head to the side of the screen area every few minutes to get enough airflow over my visor to blow away the rain drops on it. A fool's paradise?
Laminar-flow screens are ones where air is introduced at the bottom, usually through a slot or gap, in such a way as to cause the airflow to flow up inside the screen surface and continue on an upward path after leaving the top, hopefully then clearing the rider's head. Deflector-screens hope for the same end result by simply turning the airflow upwards on the outside of the screen. Some screens employ both systems, but the one shown in this thread is more of a deflector type. Still looks good to me though.
Recently I increased the gap at the bottom of the modified Givi A620 screen on my Buell to introduce a laminar-flow system. And it does seem to have worked. The stock front nacelle is pretty upright and acts to deflect air upwards anyway, and that made the screen mounted above and partly overlapping it a good candidate for laminar-flow to work. Some bugs? Yes. Good visibility in rain? Yes. Good helmet ventilation? Yes. Good looking?............