The proverbial...
Ok, guys, how's this?
I stand up on the pegs of my Adventure in the fast lane and I get cleeeean air... no turbulence and relatively little noise. I sit down and there is slight buffeting and a LOT of noise..
So, as an experiment, I remove the screen in a lay-by (wishing I'd brought a cargo net or at the very least a ball of string) and stuff it up my jacket.
Back above 50 and my System 4's as noisy as ever (even with cheap ear-plugs). After conducting various shielding experiments with my left hand, I discover that most of the noise is coming up thru the bottom of my helmet just behind my left ear. If I try and seal off that area with my gloved hand, the noise drops off drastically.
I also find that flipping the lid open has an effect of drastically reducing the wind noise. I'm not sure what conclusion to draw apart the fact that I hope my future custom earplugs do thier job propery.
So what conclusions can I draw...?
1) System 4's are very noisy?
2) That wind noise and turbulence are effectively unrelated?
3) That turbulence on the GS is emminating from sources other just the windscreen?
4) Stick to less than 50 with my helmet open...?
5) Buy some custom earplugs?
6 Stand up all the time?
You decide...