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Cj-7
Dr. Paul MacCready got a patent for a windshield fairing for JEEP-type vehicles.
Looking at it,you'd swear it was a parachute.The device attached to the face of the windshield framew like a 3/4 window frame with shallow tunnel inside, projecting forward as deep as the distance to the frame edge with a semicircular sweeping radius curving back around to the A-pillars,and up to the header.Looked like a rectangular fiberglass inner tube split in half.
This greater radius prevented flow separation around the otherwise squared off frame.The semicircular form prevented formation of blind spots.No one would believe that such a thing could help but I believe that something like this is one of the few things which would help you.
In a wind tunnel,at zero yaw,after painstaking work you might get the air deflected around the frame,but with any crosswind,you'd be right back with separation.
I'd look for some PVC pipe of proper size, rip it into half tube sections,miter the corners, and attach firmly.
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