Rotor system with a U-shaped beam member

A rotary wing aircraft comprising:

• a fuselage;
• at least one prime mover supported in the fuselage;
• a rotor system operatively connected to the at least one prime mover, the rotor system comprising:
• a rotor hub including a first beam attachment member and a second beam attachment member;
• a hub arm including a U-shaped beam member connected to the rotor hub, the U-shaped beam member including a first end portion, a second end portion and an intermediate section connecting the first and second end portions, the first end portion being connected at the first beam attachment member and the second end portion being connected at the second beam attachment member;
• a pitch change bearing mounted between the first and second beam attachment member through the first end portion and the second end portion;
• and
• a centrifugal force (CF) bearing arranged within the U-shaped beam member, the CF bearing including a support member connected to an inner surface of the U-shaped beam member, wherein an elastomeric member is connected to the support member, the support member and the elastomeric member being spaced from the intermediate section.