초록

The blades of the rotor which can rotate in the transverse duct have an angular distribution according to an uneven azimuth modulation given by the following sinusoidal law: Qn=n×360°/b+DQm×n×360°/b) where QDQDQDQ

대표청구항 ▼

Counter-torque device for a helicopter, comprising a variable-pitch multi-blade rotor mounted so that it can rotate substantially coaxially in a duct for a flow of air of axis substantially transversal to the helicopter and passing through a fairing incorporated into the tail part of the helicopter,

Counter-torque device for a helicopter, comprising a variable-pitch multi-blade rotor mounted so that it can rotate substantially coaxially in a duct for a flow of air of axis substantially transversal to the helicopter and passing through a fairing incorporated into the tail part of the helicopter, so that the pitch change axes of the blades move in a plane of rotation substantially perpendicular to the axis of the fairing duct, the blades of the rotor having an angular distribution about the axis of the rotor with an uneven azimuth modulation, wherein the azimuth modulation of the blades is substantially given by the following sinusoidal law: Qn=n×360°/b+DQsin (m×n×360°/b) where Q1 to 4, which is not prime with the number b of blades, chosen from 6 to 12, and DQDQDQ1.5 radian to 1 radian.