the biggest drawback to having a windshield on a motorbike is when its hot and sunny, and you are sitting in dead air cooking in the heat or sun
the way most touring bikes deal with this is to put ports in the windshield you can adjust to let some air thru, or there are flaps on the side that direct some of the laminar flow off the edge back in towards the rider
even a flap the size of a popsickle stick will throw a surprising amount of air in at you.
the only thing Ive found I can do while riding is stick my knees out sideways, to throw some turbulant air in on me. That gets tiresome after about 10 minutes.
Your suggestion about flipping the windshield downside up gave me an idea I have never seen done: sometimes people get a bike or a windshield, and its too short. You could certainly take two short windshields and stack them on their mounting brackets, using the spaced out holes to make it tall when you want, or short when they are 100% sandwiched over each other. It would be a bit tedious to adjust.
I think if you put it back where the saddle bag goes, horizontal, it would act like a tail on a plane and might make the bike squirrely.
Most of the time, if the weather is above 50F, and Im not riding all the way on the interstate, the windshield stays in the garage.
Last edited by KCW; 04-20-2019 at 11:10 AM.