Patent ID: 8105034

Claim:
A vertical-axis wind turbine comprising: a rotatable vertical axis; at least two turbine blades, each turbine blade having an upper and a lower end; a supporting arm attaching at least one of the upper and lower end of each turbine blade to the rotatable vertical axis, the supporting arm having a proximal end connected to the rotatable vertical axis and a distal end located near the corresponding end of the respective turbine blade; a connecting element that can be purely tensile-loaded having a proximal end connected to the rotatable vertical axis and a distal end located at a distance from the rotatable vertical axis, the proximal end of the connecting element that can be purely tensile-loaded being connected to the rotatable vertical axis at a location that lies outside a part of the rotatable vertical axis that is taken up by a horizontal projection of the turbine blade on the rotatable vertical axis, the distal end of the connecting element that can be purely tensile-loaded being connected to at least one of the distal end of a respective supporting arm, and an end of a turbine blade connected to the distal end of the respective supporting arm; and a convex/concave blade disposed between the connecting element that can be purely tensile-loaded and the supporting arm, the convex/concave blade being convex at an attack side defined by a direction of power generation rotation of the turbine blades and concave at a side opposite the attack side, the convex/concave blade having an angle of attack edge, wherein a first line defined by projecting the angle of attack edge on a horizontal plane, and a second line defined by a projection on a horizontal plane between the proximal end and the distal end of the supporting arm, are at an acute angle with each other, and the first line has a first length, and a third line, defined by projecting the angle of attack edge on a vertical plane passing through the rotatable vertical axis and the distal end of the supporting arm, has a second length, and the first length is larger than the second length.