Abstract: A sail wind turbine system includes a vertical main shaft with a vertical axis of rotation with parallel horizontal yardarms, cross-connected and corner braced, to the vertical main shaft. A sail assembly is included that comprises rectangular sails in frames fixedly attached at the tip of parallel horizontal yardarms. An outer support structure made of vertical columns with lateral cross bracing, joins together at the vertical main shaft in the middle and top, and is coupled thereto with self-aligning split bearings. The support columns are anchored to the ground, thereby providing more support to the structure. Thus, the present invention is an improved technique for providing wind power to produce electrical energy at ground level.

Abstract: A square rigged sail wind turbine includes a vertical main shaft (with a vertical axis of rotation), with parallel horizontal yardarms, cross-connected and corner braced, to the vertical main shaft. A sail assembly is included that comprises rectangular sails in frames pivotally attached at the tip of parallel horizontal yardarms. The rectangular sails in frames are configured to move between a closed position and an open position relative to the parallel horizontal yardarms. An outer support structure made of vertical columns with lateral cross bracing, joins together at the vertical main shaft in the middle and top, and is coupled thereto with self-aligning split bearings. The support columns are anchored to the ground firmly with three-way guy-wire in two places on each column, thereby providing more support to the structure. Thus, the present invention is an improved technique for providing wind power to produce electrical energy at ground level.