A hovering wind turbine whose blades lie on the surface of an imaginary horizontal cylinder and have their pitch angle changing as {TAIL ~ a function} of the rotational angle, allowing them to gather wind energy mainly in the upwind and downwind sectors of the cylindrical path and to use a fraction of the gathered energy to create lift by deflecting air downwards, mainly in the upper and lower sectors of {HEAD ~ the cylindrical path} 
A hovering wind turbine whose blades lie on the surface of an imaginary horizontal cylinder and have their pitch angle changing as { TAIL ~ a function } of the rotational angle , allowing them to gather wind energy mainly in the upwind and downwind sectors of the cylindrical path and to use a fraction of the gathered energy to create lift by deflecting air downwards , mainly in the upper and lower sectors of { HEAD ~ the cylindrical path }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD