Counter-torque device with an inserted tail rotor and phase modulation of the rotor blade position of a helicopter

摘要

The blades (10) of the rotor (7) to rotate in the stream (6) transverse to have an angular distribution of the azimuth modulation irregular given by the sine law: & br / (see appended drawing in bopi) & br / & & br / where thetan is the angular position of the n th of the blades (10) counted in succession on the basis of any origin, b is the number of blades (10), m is an integer, chosen from 1 to 4 which is not a first with the number b of the blades (10), chosen from 6 to 12 and delta theta is greater than or equal to a minimum value delta theta min, which is such that the product delta theta min b is chosen within a range extending from 1,5 radian to 1 radian. & br / application to the equipment of helicopters.