Rotary-wing aircraft individual rotor blade pitch control system

A rotor blade pitch control system for a rotary-wing aircraft having a plurality of rotor blades mounted to a main rotor and driven about a central axis of rotation at an operational speed and in a rotational direction relative to a non-rotating body of the aircraft comprising:

• a first rotor blade connected to a main rotor and operatively configured to be driven about a central axis of rotation relative to a non-rotating body of the aircraft;
• said first rotor blade rotatable about a first pitch axis;
• a first blade pitch control motor having a first stator, a first pitch drive rotor and a first pitch follower;
• a first linkage extending between said first pitch follower and said first rotor blade;
• a first rotor blade coupling between said first linkage and said first rotor blade;
• said first rotor blade coupling having a first rotor blade coupling center;
• a first pitch follower coupling between said first linkage and said first pitch follower;
• said first pitch follower coupling having a first pitch follower coupling center;
• a first hinge coupling between said first linkage and said main rotor;
• said first hinge coupling having a first hinge axis;
• said first pitch drive rotor having a first cam surface orientated about a first driven axis that is eccentric to said central axis of rotation;
• said first linkage extending between said main rotor and said first pitch follower such that said first pitch follower coupling center rotates about said central axis of rotation with rotation of said first hinge coupling about said central axis of rotation;
• said first pitch drive rotor operatively configured to be driven about said central axis of rotation independently of said main rotor to selectively rotate said first driven axis about said central axis of rotation;
• said first driven axis and said first pitch follower coupling center having a selectively variable first displacement angle defined by an inclusive angle between a line extending radially between said central axis of rotation and said first driven axis and a line extending radially between said central axis of rotation and said first pitch follower coupling center;
• and
• wherein said first pitch drive rotor may be rotated about said central axis of rotation relative to said main rotor to control a pitch of said first rotor blade about said first pitch axis.