Hello there, the taller the screen at high speeds seems to cause more turbulence, i and alot of test pilots seem to find that clean undisturbed air is the quietest.
Earplugs are a must i rekon,
As for helmets , well i must try out other peoples first,,the HJC i think, has good ,good results ,Nick Crisp tells me,,and only £200 which aint alot for a good helmet...
umm my Christmas list has started(oops,,mentioned the Christmas word,,) naughty