Bell Helicopter Textron Inc.

John T Brieger

Paul Branson Sherrill

Dudley E Smith

Charles L Hollimon

Jimmy Charles Narramore

John Michael Kebrle

James R Andrews

Justin Daw

Jim Hurdle

Sidney Xue

Bryce Docker

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.

Counter-torque device for a helicopter

Growing community of inventors

Colleyville, TX, United States of America

John T Brieger