What is the dominant force affecting the rotor system of a helicopter?

The dominant force affecting the rotor system of a helicopter is primarily related to the centrifugal forces. When the rotor blades rotate, they create a tension in the blades due to their motion which generates centrifugal forces. These forces are critical in maintaining the structural integrity of the rotor system and allowing the blades to maintain their lift.

As the rotors spin, they experience a continuous outward force that acts perpendicular to the rotor axis. This is essential because it counterbalances the weight of the rotor blades themselves and ensures they remain in a horizontal plane during flight. Without sufficient centrifugal force, the blades would not be able to operate effectively, leading to potential instability or failure of the rotor system.

In conjunction with lift forces generated by the angle of attack and drag forces acting against the motion, centrifugal force plays a significant role in the dynamics of a helicopter's flight. However, in the context of the primary influence on the rotor system, centrifugal force is the predominant factor.