Main rotor for helicopter has each blade mounted on torsionally-stiff shaft which can bend in flapping mode accommodated inside drag deflection resistant fairings attached to rim on top of mast

摘要

The ring (6) forms part of the rotor blade mounting and angle adjustment system (4) and lies in a plane at right-angles to the axis (A) of the mast. Each blade (2) has a torsionally-stiff shaft (14), which can bend in the flapping mode, attached to its root and to the ring to adjust its pitch. The shaft is held in a bearing (16) in the ring, and is turned by a lever (18) attached to an actuator (8) pivoted on the top edge of the ring. The shaft is surrounded by a streamlined blade root fairing (12) which may resist bending due to drag on the blade. The joystick (28) is connected to a control box (26) via a data line (24). The pilot's control signal (Sp) is processed in the data box to produce a signal (S) passed to the ring through an inductive coupling (10,20,22).