Abstract: A propeller blade assembly which enables the mounting of a propeller blade in a hub assembly includes a bearing arrangement that circumferentially surrounds and engages with a section of the propeller blade. The bearing arrangement comprises an inner race assembly of angular contact bearings, and an outer race assembly of roller bearings. The roller bearings being arranged so that the axis of rotation thereof is substantially parallel to the longitudinal axis of the propeller blade.

Abstract: A variable-pitch bladed rotor including a plurality of blades extending outwardly from a hub in which they are each mounted by a respective ball-screw device. Each device comprises inner and outer races each provided with at least one helical groove, a plurality of balls co-operable with the grooves, and a cylindrical cage disposed between the races which is suitably apertured for accommodation of the balls. The cage supports gearing so associated with the inner and outer races that on pitch-change movement of the respective blade the cage is positively driven, thereby to turn about the blade longitudinal axis.