Windmill rotor and wind blades therefor
First Claim
1. A windmill of the front-runner type having a rotor rotatably carried on a windmill tower for rotation about a substantially horizontal axis of rotation and having a plurality of airfoil shaped blades mounted on the rotor with a front side thereof adapted to face away from the tower and counter to a direction of wind travel toward the tower, the airfoil shaped blades projecting radially from the rotor a distance which renders the blades resiliently bendable toward the windmill tower under the action of moderate to strong wind pressure applied to the front side of the blades;
- wherein said airfoil shaped blades have a rotor-mounted body portion which extends in a plane which is perpendicular to said axis of rotation and have a free tip end portion which has a longitudinal forward curvature relative to said normal plane, said curvature extending along at least an outer one-third of the blade in a longitudinal direction of the blade and being of a magnitude which places a free tip end of each blade completely in front of said normal plane so as to avoid that said resiliently bendable blades contact the windmill tower during strong wind pressure.
4 Assignments
0 Petitions
Accused Products
Abstract
A windmill rotor of the front-runner type and airfoil type wind blades therefor in which the blade tips have a longitudinally forwardly curved configuration. The curvature solves the problem of inward flexure of the blade in strong wind conditions, without requiring modification of the manner in which the rotor as a whole is mounted in order to avoid having the blade strike the windmill tower under such strong wind conditions.
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Citations
6 Claims
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1. A windmill of the front-runner type having a rotor rotatably carried on a windmill tower for rotation about a substantially horizontal axis of rotation and having a plurality of airfoil shaped blades mounted on the rotor with a front side thereof adapted to face away from the tower and counter to a direction of wind travel toward the tower, the airfoil shaped blades projecting radially from the rotor a distance which renders the blades resiliently bendable toward the windmill tower under the action of moderate to strong wind pressure applied to the front side of the blades;
- wherein said airfoil shaped blades have a rotor-mounted body portion which extends in a plane which is perpendicular to said axis of rotation and have a free tip end portion which has a longitudinal forward curvature relative to said normal plane, said curvature extending along at least an outer one-third of the blade in a longitudinal direction of the blade and being of a magnitude which places a free tip end of each blade completely in front of said normal plane so as to avoid that said resiliently bendable blades contact the windmill tower during strong wind pressure.
- View Dependent Claims (2, 3)
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4. A rotor for a windmill of the front-runner type, said rotor having a shaft projecting from a rotor hub in a direction of wind travel and adapted for rotatably carrying the rotor directly on a windmill tower for rotation about a substantially horizontal axis of rotation passing through the windmill tower and having a plurality of airfoil shaped blades mounted on the rotor with a front side thereof adapted to face in an opposite direction from said shaft and counter to said direction of wind travel, the airfoil shaped blades projecting radially from the rotor a distance which renders the blades resiliently bendable toward the windmill tower under the action of moderate to strong wind pressure applied to the front side of the blades;
- wherein said airfoil shaped blades have a rotor-mounted body portion which extends in a plane which is perpendicular to said axis of rotation and have a free tip end portion which has a longitudinal forward curvature relative to said normal plane, said curvature extending along at least an outer one-third of the of the blade in a longitudinal direction of the blade and being of a magnitude which places a free tip end of each blade completely in front of said normal plane so as to avoid that said resiliently bendable blades contact the windmill tower during strong wind pressure.
- View Dependent Claims (5, 6)
Specification