Patent · US Active

Counter-torque device for a helicopter

US8640984B2 · kind B2 · utility

10Cited by

14References

14Claims

0Family size

Assignee

Bell Helicopter Textron Inc. · US

Inventors

John Michael Kebrle · Dallas, US
James R. Andrews · Lafayette, US
Justin Daw · Fort Worth, US
Jim Hurdle · Fort Worth, US
Paul Sherrill · Grapevine, US
Jimmy Narramore · Bedford, US
Sidney Xue · Colleyville, US
Charles Hollimon · Oosterdijk, US
Dudley E. Smith · Arlington, US
Bryce Docker · Arlington, US
John T. Brieger · Colleyville, US

Key dates

Filing date	Aug 7, 2012
Grant date	Feb 4, 2014
Priority date	—
Expiry date	Aug 7, 2032

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T50/60
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.