So what is the right amount of wind to have on the rider?
Too quiet may make you feel like you're in a cage.
Too much and it causes noise and neck fatigue.
What say you???
Well, it depends on all kinds of factors, such as size of rider, size of windshield, seating position, height, handlebar position, custom seat, tail or head wind speed, etc.
MY experience has been on a couple of unfaired bikes, then a Kawasaki 900 with Windjammer fairing, then an R90s, then two R100RS's, then two K100RS's, and now a K1300s.
What I've found is in each case except the Windjammer, there is a certain wind speed that balances the rider's lean forward such that there is a minimum blast of air against the rider, but most/all of the weight on the hands is eliminated. Faster and you're hanging on against the wind, or hunkering down a bit to raise the 'balance speed'.
On an unfaired bike, that seems to be around 65mph. On my R90s, with minimal fairing, it was about the same -65-70mph was the most comfortable.
On the RS models, all of them (and the K1300s) have wind hitting me just around the armpit level so my shoulders and head are in the wind. I like a windflow that puts the turbulence below my helmet, so it is getting smooth air hitting it. I've got a fairly long torso at 6'2" (only 33" inseam), so if I have good posture, my head is in the smoother, quieter air. With the lean angle of the R100RS, the balance speed was up around 75mph, and there was a nice smooth engine RPM in that range as well.
With the K100RS, the balance speed was about around 75-80. With the K1300s and it's smaller windscreen, the most comfortable speed is definitely 85mph with no wind.
What really kills me in the K1300s is riding at 45mph in traffic. Especially ater a few hundred miles have turned my wrists into sore points.