Rotor blade structure
First Claim
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1. A rotor blade for a wind generator, comprising;
- a plurality of straight spars each having a longitudinally uniform, rectangular cross-section, and all secured to one another in lateral contact with one another to provide an integral unit thereof, similar to a plank;
a skin of synthetic plastic foam embedding the unit of spars and defining a rotor blade having an exterior, aerodynamic profile, the number of the spars, transverse of the rotor blade, diminishing longitudinally from a hub end of the rotor blade, and the uniform cross-section of each spar having an area corresponding to the cross-sectional area of a directly embedding portion of the rotor blade; and
means for attaching the hub end of the rotor blade to a hub, whereby the rotor blade has maximum strength near the hub.
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Abstract
A system of spars, each having a rectangular cross-section, is provided by placing the spars in lateral juxtaposition to one another like a plank to form a rotor blade. A skin of plastic foam is provided on the blade. The cross-sections of the spars, and the corresponding cross-sections of the blade, are varied in accordance with aerodynamic requirements. The spars are kept in position by means of clamps and/or connections and/or rings, forming an integral unit similar to a plank; and the integrated spars are directly attached to a hub or an electric generator.
20 Citations
3 Claims
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1. A rotor blade for a wind generator, comprising;
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a plurality of straight spars each having a longitudinally uniform, rectangular cross-section, and all secured to one another in lateral contact with one another to provide an integral unit thereof, similar to a plank; a skin of synthetic plastic foam embedding the unit of spars and defining a rotor blade having an exterior, aerodynamic profile, the number of the spars, transverse of the rotor blade, diminishing longitudinally from a hub end of the rotor blade, and the uniform cross-section of each spar having an area corresponding to the cross-sectional area of a directly embedding portion of the rotor blade; and means for attaching the hub end of the rotor blade to a hub, whereby the rotor blade has maximum strength near the hub. - View Dependent Claims (2, 3)
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Specification