The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 04, 2014
Filed:
Aug. 07, 2012
John M. Kebrle, Dallas, TX (US);
James R. Andrews, Mansfield, TX (US);
Justin Daw, Fort Worth, TX (US);
Jim Hurdle, Fort Worth, TX (US);
Paul Sherrill, Grapevine, TX (US);
Jimmy C. Narramore, Bedford, TX (US);
Sidney Xue, Colleyville, TX (US);
Charles Hollimon, Forth Worth, TX (US);
Dudley Smith, Arlington, TX (US);
Bryce Docker, Arlington, TX (US);
John T. Brieger, Colleyville, TX (US);
John M. Kebrle, Dallas, TX (US);
James R. Andrews, Mansfield, TX (US);
Justin Daw, Fort Worth, TX (US);
Jim Hurdle, Fort Worth, TX (US);
Paul Sherrill, Grapevine, TX (US);
Jimmy C. Narramore, Bedford, TX (US);
Sidney Xue, Colleyville, TX (US);
Charles Hollimon, Forth Worth, TX (US);
Dudley Smith, Arlington, TX (US);
Bryce Docker, Arlington, TX (US);
John T. Brieger, Colleyville, TX (US);
Bell Helicopter Textron Inc., Hurst, TX (US);
Abstract
A ducted fan for a helicopter includes a transverse duct and a counter-torque device supported within the duct. The counter-torque device includes a rotor rotatably mounted within the duct and a stator fixedly mounted within the duct downstream from the rotor. The rotor includes a rotor hub having a rotor axis, and rotor blades extending from the hub. The Rotor blades have a modulated angular distribution about the rotor axis. The stator includes a stator hub, and a plurality of stator vanes distributed around the stator hub. The stator vanes are angularly modulated around the stator hub.