Empennage of a helicopter

摘要

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.

主权项

1. An empennage of a helicopter comprising:
a ducted counter-torque device with a multi-blade rotor of rotor blades, the rotor being actuated by an actuation shaft mounted along a tail boom, and flow-straightening stators of stationary vanes disposed substantially in a star configuration parallel to the rotor plane downstream from the rotor inside a shroud of the ducted counter-torque device, wherein at least the shroud of the ducted counter-torque device is sheathed with a composite structure of an outer erosion protecting surface layer made of a hard plastic or a plastic composite material and at least one succeeding layer of an elastomeric damping material; wherein the shroud of the ducted counter-torque device with the composite structure of the outer erosion protecting surface layer made of the hard plastic or the layer of plastic composite material succeeded by one layer of the elastomeric damping element is further succeeded by a layer of plastic composite material being succeeded by one layer of the elastomeric damping material succeeded by another layer made of the plastic composite material or metal.