Adaptively-twistable blade, and an aircraft including such a blade

An adaptively-twistable rotor blade provided with a lift element having an outer covering extending spanwise in a longitudinal direction from a first end zone to a second end zone, and transversely from a leading edge to a trailing edge, the outer covering defining an internal cavity, wherein said blade includes at least one adaptive twister system provided with:

• a carriage arranged in said cavity, said carriage having a torsion bar extending along said longitudinal direction and at least two arms that are secured to the torsion bar and that extend transversely on either side of the torsion bar, said carriage being movable in translation in said cavity along said longitudinal direction;
• a connection on each arm for connecting said carriage to the outer covering, each connection including a segment including an upstream guide gallery arranged in the cavity between the leading edge of the blade and the torsion bar and a downstream guide gallery arranged in the cavity between the trailing edge of the blade and the torsion bar, each arm extending transversely from an upstream end that slides in an upstream guide gallery to a downstream end that slides in a downstream guide gallery;
• and
• at least one of said connections being a helical connection such that the segment associated therewith is a twister segment and the upstream guide gallery and the downstream guide gallery for the twister segment present distinct orientations, and impart movement in rotation to the twister segment under the effect of the carriage moving in translation.