Abstract: A wind machine which includes turbine assemblies arranged in superposed relationship and wherein the turbine assemblies may vary in size and number in accordance with power requirements, together with a plurality of deflector panels or sails associated with the turbine unit of each assembly for directing the wind to selected areas of the driving vanes of each turbine unit and at the same time shielding from the wind other areas of driving vanes which would tend to interfere with desired rotation of the turbine unit. The deflector panels or sails also accurately controlling the volume of air which bypasses each panel or sail to thereby prevent "stacking" or turbulence adjacent the driving vanes of the turbine unit. The panels also being arranged to recapture the major portion of the bypassed air and direct it back into the turbine unit which increases efficiency of operation.