Empennage of a helicopter
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United States of America Patent
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Feb 23, 2016
Grant Date -
Mar 13, 2014
app pub date -
Sep 9, 2013
filing date -
Sep 7, 2012
priority date (Note) -
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Abstract
An empennage (1.1) of a helicopter comprising a ducted counter-torque device with a multi-blade rotor (4) of rotor blades (3) and optional vertical tail fins (1.2). Flow-straightening stators (5) of stationary vanes are disposed substantially in a star configuration parallel to the rotor plane downstream from the rotor (4). A shroud (2.1) of the ducted counter-torque device is sheathed with a composite structure of an outer erosion protecting surface layer (7.1, 8.1) made of a hard plastic or a plastic composite material, and at least one succeeding layer (7.2, 8.2) of an elastomeric damping material.
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