Rotor, especially for rotary wing aircraft

A rotor, especially for rotary wing aircraft, comprising a rotor hub and a plurality of rotor blades, each blade having a blade root, a blade neck, a blade wing section, and a torsion stiff blade pitch angle control sleeve, said blade neck being torsionally yielding for allowing a blade pitch angle adjustment movement, said blade neck being arranged between said blade root and said blade wing section, bolts and first bore means (3') connecting each rotor blade root to said rotor hub in an operating position, said torsion stiff blade pitch angle control sleeve extending coaxially around said torsionally yielding blade neck for transmitting blade pitch angle adjustment forces to said wing section, a radially outer end of said torsion stiff blade pitch angle control sleeve being rigidly connected to said blade wing section, means for securing a radially inner end of said torsion stiff blade pitch angle control sleeve to said blade root in a movable relative to said blade root, a blade angle adjustment rod (4), pivot means (5.1.1) journalling said blade pitch angle adjustment rod (4) to said torsion stiff blade pitch angle control sleeve (5) near said blade root, said rotor further comprising additional connecting bore means (13) for at least one rotor blade of two rotor blades of which one rotor blade follows the other rotor blade, said additional connecting bore means including one bore passing through said rotor hub and another bore passing through said blade root of said at least one rotor blade, said two bores aligning axially with each other along a bore axis for permitting folding the respective blade into a folded position and for holding the respective blade in an operative position, said additional bore means (13) being located on the same side as said pivot means and as close as possible to said pivot means, so that the respective blade pitch angle adjustment rod (4) with its pivot means can rotate along a circular arc having its center in said bore axis, whereby blade folding is possible without disconnecting said pivot means (5.1.1), said additional bore means being adapted for receiving one of said connecting bolts for holding the respective rotor blade in a folded position.