Propeller blade or vane for an aircraft with particular weaving of a fibre preform receiving a bladder filled with a shaping foam

A method for manufacturing an aircraft propeller blade or vane comprising:

• producing, by three-dimensional weaving between a plurality of warp yarn layers and a plurality of weft yarns layers, a fibrous structure in a single piece, the structure comprising a root part and an aerodynamic profile part extending along a longitudinal direction between the root part and a blade tip portion and along a transverse direction between a leading edge portion and a trailing edge portion, said structure including a separation forming a housing inside the fibrous structure,
• shaping the fibrous structure by introducing a bladder into the housing of the fibrous structure and by filling the bladder with a shaping foam,
• densifying the preform using a matrix to obtain one of a propeller blade or vane having a fibrous reinforcement consisting of said preform and densified by the matrix,
• wherein the separation extends over a separation zone inside the aerodynamic profile part of the fibrous reinforcement comprised between the root part and the blade tip portion in the longitudinal direction and between the leading edge portion and the trailing edge portion in the transverse direction, the separation opening to the outside of the aerodynamic profile part of the fibrous reinforcement.