Propeller propulsion system for an aircraft comprising means for adjusting the pitch angle of the blades of the propeller and aircraft comprising such a propulsion system

The invention relates to an aircraft propulsion system (1) comprising a longitudinal axis (A1) and: – a propeller (2) mounted movably in rotation about the longitudinal axis (A1) and comprising a plurality of blades (20) distributed angularly with respect to said longitudinal axis; and – first means (3) for adjusting the pitch angle of said blades configured to modify the pitch angle of each blade as a function of the angular position of each blade about said longitudinal axis.