Abstract: A wind diode with vanes having flexible flaps arrayed linearly along flap supports to catch the wind against the flaps supported by a filament array or, rotating to the opposite direction, to allow the wind to pass through the filament array by moving the flaps into a position that does not catch the wind. By using multiple flaps in the array, variations in the wind velocity profile across the vane are accounted for, thereby reducing drag. The wind diode is preferably mast-mounted, with the drive train attached to the exterior of the mast. Vertical and horizontal wind diodes are possible, as is a hybrid that is reconfigurable to be used in either orientation. The drive train preferably uses a continuous variable range transmission to provide constant speed output.