said {TAIL ~ pitch angle} and a position of the blades gather wind energy in the upwind and downwind sectors of the cylindrical path and generate {HEAD ~ lift} in the upper and lower sectors of the cylindrical path, 
said { TAIL ~ pitch angle } and a position of the blades gather wind energy in the upwind and downwind sectors of the cylindrical path and generate { HEAD ~ lift } in the upper and lower sectors of the cylindrical path ,
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 HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH