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FOIL STRUCTURES WITH REDUCED SOUND GENERATION

  • US 3,853,428 A
  • Filed: 09/21/1973
  • Issued: 12/10/1974
  • Est. Priority Date: 01/27/1972
  • Status: Expired due to Term
First Claim
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1. For use as rotors, stators, flaps and the like in a fluidflow medium, a foil structure having means for reducing the flow impedance of at least one of leading and trailing edge portions of the foil surfaces to a value substantially closer to the characteristic impedance of the medium and at which the flow impedance and the characteristic impedance are substantially matched.

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