You left out a part:Ok, I'll play!How about...if it opened from back to front? This way would avoid " puckering" or "bunching up" the canvas, and if the pleats are made to lean to the back, it would form a "wedge-shaped air deflector" at the leading edge. Using some strategically placed rare earth magnets in the pleats ( as it folds up, the pleats would stick together) would keep the narrow end from hanging down thru the opening.
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"..... would keep the narrow end from hanging down thru the opening blocking your forward view through the windshield."
Always remember to bring out the safety aspect.
