Arrangement and equipment for the displacement of blades, particularly propeller blades

In equipment for the adjustment of rotor blades, particularly propeller blades of fans, turbines, and the like, and especially for propulsion plants on aircraft adapted to be selectively shut-off in a low-resistance position, said equipment including a rotor hub with blades pivotally mounted thereon, said blades (20) having a longitudinal axis (L.sub.A) and a twist (.DELTA..sub..theta.) about said axis (L.sub.A) between the chord line (S.sub.PF) at the blade root and the chord line (S.sub.PS) at the blade tip,

• the improvement comprising means whereby said blades (20) are each selectively pivotal about pivot support means on the hub into an operational or a collapsed position,
• said blades (20) when collapsed forming, by means of the position of pivot axes (33) of said pivot support means, helical cut-outs of a common cylindrical or conical envelope with the longitudinal axes (L.sub.A) extending at a slant imparted by the twist (.DELTA..sub..theta.) with respect to the longitudinal direction of said envelope,
• the position of the pivot axes (33) at a common base circle being determined by the slant of the pivot axes (33) with respect to the plane of rotation (E--E) of said blades (20) and by the slant of the axes (33) with respect to the chord line (S.sub.PF) at the blade root.