Propeller propulsion system for aircraft including means for adjusting the blade angle of the blades of the propeller and aircraft including such a propulsion system

A propulsion system for an aircraft comprising:

• a propeller mobile in rotation around a longitudinal axis, said propeller including a plurality of blades each having a blade axis globally perpendicular to the longitudinal axis, said blades of the plurality of blades being distributed angularly relative to said longitudinal axis;
• and
• first means for adjustment of a blade angle of said blades of the plurality of blades, said first adjustment means configured to modify the blade angle of each blade of the plurality of blades as a function of an angular position of each said blade of the plurality of blades around said longitudinal axis,
• wherein said first adjustment means include a globally tubular roller coaxial with said longitudinal axis, said globally tubular roller including on an external surface a housing configured to receive respective roots of said blades of the plurality of blades, said housing extending in a first plane having a non-zero angle (α) of which relative to a plane perpendicular to a reference plane containing said longitudinal axis is between −15° and +15°.