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phord,
Several cars have a a single wiper from the factory. Citroen , Mercedes Benz and other have all used one blade for aero reasons. The usual design puts the pivot point at the base of the screen in the centre and allows the single blade to follow the airflow patterns around the glass.
From a user point of view the best design have the start point on the driver side other wise it is along time between wipes if it is parked on the other side !
The wiper motor needs to be a heavier design as well since the larger blade means more stiction and drag to overcome.
Speaking of parking the blade normally sits along the base of the screen since having it positioned vertically means it is in drivers line of sight and causing drag when it does not need to.
Pete.
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