{TAIL ~ a means} for controlling a pitch angle of said blades by a crankshaft means as a function of the rotational angle to provide said blades with the dual capability of gathering wind energy and {HEAD ~ generating airlift} for the station, where 
{ TAIL ~ a means } for controlling a pitch angle of said blades by a crankshaft means as a function of the rotational angle to provide said blades with the dual capability of gathering wind energy and { HEAD ~ generating airlift } for the station , where
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 HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH