Patent ID: 7582981

Claim:
An airborne system for producing electricity from wind energy, comprising: a turbine section comprising: a shaft; at least first and second turbines rotatably mounted to said shaft and arranged to rotate independently of one another and in opposite directions about said shaft when subjected to a same wind; and at least first and second generators respectively coupled to said at least first and second turbines and arranged to convert rotation of said first and second turbines into electricity, said generators being mounted so as to be fixed relative to said shaft, the magnitude of electricity generation by said generators being related to a torque induced on said shaft by said generators responsive to rotation of said turbines relative to said shaft; a lifting system coupled to said turbine section for generating a lifting force to cause said turbine section to be airborne at a desired altitude; an anchoring section arranged to anchor said turbine section relative to the ground; and said turbines having aerodynamic characteristics which provide in combination with the effect of the electricity generation by said generators a situation where a sum of torques acting on said shaft is substantially zero so that said turbine section is angularly stable when airborne; wherein electricity generated by said generators is conducted to an energy utilization device for usage or to electricity storage.