Rotor blade assembly for bearingless rotor

A rotor system of a rotary wing aircraft comprising:

• a rotor hub rotatable about an axis of rotation;
• a rotor blade having an aerodynamic shape and connected to the rotor hub to rotate about the axis of rotation;
• a structural member connected to and extending radially outward from the rotor hub and connected to the rotor blade, wherein the structural member includes a plurality of layers of composite material having fibers oriented lengthwise along a central axis which is perpendicular to the rotational axis and which are wrapped about a pin arranged adjacent an inboard end of the structural member adjacent the rotor hub such that the fibers extend along the central axis to carry a centrifugal load of the rotor blade and the plurality of layers form an opening filled by the filler component and which decreases as a function of distance from the pin along the central axis;
• a fastener receivable within the pin to couple the structural member to the rotor hub.