Counter-torque device for a helicopter
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United States of America Patent
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Oct 16, 2012
Grant Date -
Jan 15, 2009
app pub date -
Jul 15, 2005
filing date -
Jul 16, 2004
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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Family
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