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Method of reducing a nose-up pitching moment on a ducted unmanned aerial vehicle

  • US 6,170,778 B1
  • Filed: 04/22/1999
  • Issued: 01/09/2001
  • Est. Priority Date: 04/22/1999
  • Status: Expired due to Fees
First Claim
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1. A method for reducing a nose-up pitching moment in an unmanned aerial vehicle during forward flight, the unmanned aerial vehicle including counter-rotating rotor assemblies mounted within a duct, the duct extending downwardly through a fuselage in the unmanned aerial vehicle, each rotor assembly including a plurality of rotor blades, the method comprising the steps of:

  • adjusting the rotor blades to have substantially zero pitch;

    rotating the rotor assemblies to produce a virtual plane across the duct, the virtual plane operative for substantially deflecting air passing over the fuselage away from the duct.

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