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Double-ducted fan

  • US 8,821,123 B2
  • Filed: 03/04/2011
  • Issued: 09/02/2014
  • Est. Priority Date: 03/08/2010
  • Status: Active Grant
First Claim
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1. A ducted air rotor comprising:

  • a hub;

    a rotor coupled to the hub and having a plurality of blades;

    a first duct adapted to circumscribe the plurality of blades;

    a second duct adapted to circumscribe at least a portion of the first duct and to define a channel between the first duct and the second duct, wherein the first and second duct are eccentrically oriented, and the second duct is axially movable with respect to the first duct to adjust a portion of the width of the channel.

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