NOVELTY - The wind turbine has a rotor gear system for coupling an inner vertical drive shaft (6) and an outer vertical drive shaft (7) to a turbine rotor shaft (9). An electrical generator converts mechanical energy of a turbine rotor into electrical energy and comprises a coaxial inner and outer generator rotor coupled to the inner and outer shafts. The rotor gear system comprises a set of conical rotor gears (10, 12) coaxially coupled with the turbine rotor shaft for engaging a first conical drive gear (13) on the inner shaft and engaging a second conical drive gear (11) on the outer shaft.    USE - Advanced high power wind turbine such as upwind wind turbine and downwind wind turbine, for use in an automobile application.    ADVANTAGE - The turbine can determine torque on one of the driving shafts, calculate amount of electrical power to be applied to the electrical generator in response to the determined torque, and apply the calculated electrical power to the electrical generator, thus limiting or preventing overstressing of the wind turbine during start-up and gusty wind conditions. The turbine converts mechanical energy generated by the wind turbine into electrical energy, so that rotational speed of the turbine rotor shaft, coupling the turbine blades, is increased without use of a planetary gearbox by proper selection of size of the rotor conical gear system, and the turbine provides double air gap speed due to two counter rotating electrical generator rotors in the electrical generator, thus reducing number of heavy maintenance sensitive components e.g. gear boxes and reducing weight of the electrical generator.    DETAILED DESCRIPTION - The electrical generator is a double rotor electrical generator. An INDEPENDENT CLAIM is also included for a method for controlling a wind turbine.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross sectional view of a rotor gear system coupling outer and inner vertical drive shafts to a turbine rotor shaft.    Inner vertical drive shaft (6)    Outer vertical drive shaft (7)    Turbine rotor shaft (9)    Conical rotor gears (10, 12)    Conical drive gears (11, 13)