U.S. Patent Specifications Available to Purchase

In an aircraft having a sustaining rotor incorporating a rotor blade pivotally mounted on drag, flapping and pitch change pivots, with flapping pivot spaced radially outwardly from the drag pivot and connected thereto by a drag link and with the pitch pivot disposed outboard of the flapping pivot, pitch control mechanism comprising a torque transmitting connexion, journal means therefor on said drag link and an arm and link connexion between said first‐named connexion and the blade, the torque transmitting connexion incorporating an angling joint and the arm and link connexion also incorporating an angling joint, said angling joints being positioned one in alignment with the axis of the flapping pivot and the other in alignment with the axis of the drag pivot.