Blade orientation of an impeller or propeller

An impeller for adapted for an air vehicle comprising:

• a hub with a horizontally oriented longitudinal axis, a first end, and a second end;
• a plurality of blades circumferentially arranged and adjustably attached to the hub, the blades extending outwardly from the hub, each of the blades having a root attached to the hub, a tip, a high pressure face, a low pressure face, a leading edge, and a trailing edge;
• and
• at least one of the blades oriented in relation to a tilted plane, the tilted plane rotated from a first vertical plane on a first axis of rotation wherein the first axis of rotation lies on the first vertical plane and the first axis of rotation is an intersection of the tilted plane and the first vertical plane, the first vertical plane perpendicularly intersecting the horizontally oriented longitudinal axis of the hub;
• wherein the tilted plane has a predetermined acute angle of between twenty degrees (20°) and seventy-eight degrees (78°) measured perpendicularly from the first vertical plane;
• wherein the blade has a first radial section cut by a first radial arc at about twenty percent (20%) of a radial length of the blade, and a second radial section cut by a second radial arc at about eighty percent (80%) of the radial length of the blade;
• wherein a center of the second radial arc and a center of the first radial arc lie on the horizontally oriented longitudinal axis of the hub;
• wherein the first section has a first blade line, the first blade line being a straight line connecting a leading edge and a trailing edge of the first section, the first blade line forming a first acute angle with the first vertical plane, measured perpendicularly from the first vertical plane, the first blade line having an angle equal to the predetermined acute angle;
• wherein the second section has a second blade line, the second blade line being a straight line connecting a leading edge and a trailing edge of the second section, the second blade line forming a second acute angle with the first vertical plane, measured perpendicularly from the first vertical plane, the second acute angle within twenty five percent (25%) of the predetermined acute angle;
• wherein the second blade line is located at one of the following locations:
• (i) between a first boundary plane of the tilted plane and a second boundary plane of said tilted plane,
• (ii) on the first boundary plane of the tilted plane, or
• (iii) on the second boundary plane of the tilted plane;
• wherein the first boundary plane and the second boundary plane share an axis of rotation, the axis of rotation being the first blade line;
• wherein the first boundary plane is rotated in a first direction and the second boundary plane is rotated in a direction opposite the first direction;
• wherein the first boundary plane and the second boundary plane are rotated from the tilted plane so that a first boundary plane acute angle from the tilted plane is about twenty-five percent (25%) of the predetermined acute angle of the tilted plane as measured from the tilted plane in the first direction, and
• wherein the second boundary plane acute angle is about twenty-five percent (25%) of the predetermined acute angle as measured from the tilted plane, and the second boundary plane of the tilted plane is rotated to the direction opposite the first direction.

An impeller for adapted for a wind turbine comprising:

• a hub with a horizontally oriented longitudinal axis, a first end, and a second end;
• a plurality of blades circumferentially arranged and adjustably attached to the hub, the blades extending outwardly from the hub, each of the blades having a root attached to the hub, a tip, a high pressure face, a low pressure face, a leading edge, and a trailing edge;
• and
• at least one of the blades oriented in relation to a tilted plane, the tilted plane rotated from a first vertical plane on a first axis of rotation wherein the first axis of rotation lies on the first vertical plane and the first axis of rotation is an intersection of the tilted plane and the first vertical plane, the first vertical plane perpendicularly intersecting the horizontally oriented longitudinal axis of the hub;
• wherein the tilted plane has a predetermined acute angle of between twenty degrees (20°) and seventy-eight degrees (78°) measured perpendicularly from the first vertical plane;
• wherein the blade has a first radial section cut by a first radial arc at about twenty percent (20%) of a radial length of the blade, and a second radial section cut by a second radial arc at about eighty percent (80%) of the radial length of the blade;
• wherein a center of the second radial arc and a center of the first radial arc lie on the horizontally oriented longitudinal axis of the hub;
• wherein the first section has a first blade line, the first blade line being a straight line connecting a leading edge and a trailing edge of the first section, the first blade line forming a first acute angle with the first vertical plane, measured perpendicularly from the first vertical plane, the first blade line having an angle equal to the predetermined acute angle;
• wherein the second section has a second blade line, the second blade line being a straight line connecting a leading edge and a trailing edge of the second section, the second blade line forming a second acute angle with the first vertical plane, measured perpendicularly from the first vertical plane, the second acute angle within twenty five percent (25%) of the predetermined acute angle;
• wherein the second blade line is located at one of the following locations:
• (i) between a first boundary plane of the tilted plane and a second boundary plane of said tilted plane,
• (ii) on the first boundary plane of the tilted plane, or
• (iii) on the second boundary plane of the tilted plane;
• wherein the first boundary plane and the second boundary plane share an axis of rotation, the axis of rotation being the first blade line;
• wherein the first boundary plane is rotated in a first direction and the second boundary plane is rotated in a direction opposite the first direction;
• wherein the first boundary plane and the second boundary plane are rotated from the tilted plane so that a first boundary plane acute angle from the tilted plane is about twenty-five percent (25%) of the predetermined acute angle of the tilted plane as measured from the tilted plane in the first direction, and
• wherein the second boundary plane acute angle is about twenty-five percent (25%) of the predetermined acute angle as measured from the tilted plane, and the second boundary plane of the tilted plane is rotated to the direction opposite the first direction.