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Aircraft folding airfoil system

  • US 4,106,727 A
  • Filed: 05/09/1977
  • Issued: 08/15/1978
  • Est. Priority Date: 05/09/1977
  • Status: Expired due to Term
First Claim
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1. A foldable airfoil comprisinga plurality of elongated channels each having one end forming a portion of the root area of the airfoil and an outer end opposite said root end,means for pivotally mounting said root end of each of said plurality of channels on a support base at spaced intervals along the root dimension of said airfoil for pivotal motion of each channel in the plane of the airfoil,each said channel having a cross sectional shape nestably containable within the cross sectional envelope of the next adjacent of the pivotally mounted channels, andmeans interconnecting the outer ends of each of said plurality of channels for rotational movement of said plurality of channels about their respective root end pivots between (1) an extended position in which the lengthwise dimension of each said channel extends spanwise of the airfoil with portions of adjacent channels overlying and (2) a retracted position in which said plurality of channels are colinear in alignment with the channel root end pivots and the cross sectional area of each of said channels is nestably contained within the envelope of the cross section of an adjaent channel, said interconnecting means including means nestingly containing said outer end of each of said plurality of channels within the envelope of the next adjacent channel in said extended position and during movement between said extended and retracted positions.

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