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Rotor blade structure

  • US 4,137,007 A
  • Filed: 12/20/1976
  • Issued: 01/30/1979
  • Est. Priority Date: 12/27/1975
  • Status: Expired due to Term
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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