Anti-torque device with shrouded rotor and straightening stator and phase modulation of the rotor blades positions, for helicopters

摘要

The tail rotor comprises a multi-blade, variable-pitch rotor mounted coaxially in an air flow channel in the helicopter tail (3), surrounded by a housing (5). The rotor blades turn with their pitch axes rotating in a plane lying perpendicular to the axis of the air flow channel, and their angular distribution about the rotor's axis has an irregular azimuthal modulation, so that the angle between any two blades of the rotor is different to the angle between any two blades (9) of the adjacent air flow rectifier stator (8). The rectifier blades are inclined in a radial direction relative to the axis of the air flow channel and in the opposite direction to the rotor blades. In addition the stator blades have their leading edges set at a distance from the rotor blades' plane of rotation at their tips corresponding to 1.3-2.5 c, where c is the chord of the rotor blades. IMAGE