The present invention relates to a rotating blade body for turbines using the Magnus effect with an axis of rotation of the turbine parallel to the direction of the motor fluid, characterised in that it is defined by a first sector or end head, more distant from said axis of rotation of the turbine, and by a second sector or rod, connecting said first sector and said axis of rotation of the turbine, said second sector having an average diameter smaller than the diameter of said first sector, said first sector being inscribed within a solid of revolution whose profile is determined so as to maintain a constant value of lift in each section.