Vertical Axis Wind Turbine with LED display

Abstract

A vertical-axis wind turbine comprises a shaft rotatable about a longitudinal axis and a plurality of blades 10 coupled to the shaft, at least one of the blades 10 having an array of light emitting diodes controlled to generate a viewable image when the turbine rotates about the axis. Preferably means for controlling the LEDs includes variable speed control means to generate a coherent image when the turbine rotates at variable rotational speeds, and is part of the turbine. Preferably the turbine generates electricity to power the light emitting diodes. Preferably the LED arrays can be arranged along a leading 17 or trailing 18 edge of a blade 10, or an upper aerofoil surface 19 of a blade 10.