Articulated Rotor
This is borrowed from full sized helicopters, and is a rotor head which allows the blades to flap, drag and feather.
Aspect Ratio ...
In a fully articulated rotor system, each rotor blade is attached to the rotor hub through a series of hinges, which allow the blade to move independently of the others. These rotor systems usually have three or more blades.
One is to allow the blades to flap on hinges (Articulated rotor system). Another way is to have the whole hub swing up and down around an internal bearing called a trunion (Semi-rigid rotor system).
It gets its name from the fact that it does not have a lead-lag hinge, the way a fully articulated rotor system does.
Also highly visible are the main rotor flight control tubes and swash plate assembly that transmit flight control inputs to the three-blade, fully articulated rotor system.
 See also: Rotor, Balance, Force, Aircraft, Helicopters
  
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