What system assists in the control and coordination of the rotor blades on the TH-73?

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The cyclic and collective control system is crucial for the operation of a helicopter like the TH-73, as it directly influences the control and coordination of the rotor blades. The cyclic control allows the pilot to tilt the rotor plane forward, backward, or sideways, facilitating lateral and longitudinal movement. By changing the pitch of the blades at different points in their rotation, the cyclic control helps in maneuvering the helicopter in various directions.

The collective control, on the other hand, adjusts the pitch of all rotor blades simultaneously, allowing for vertical movement. By increasing or decreasing the overall lift generated by the rotor system, the collective control is vital for climbing or descending.

Overall, this system is integral to the helicopter's flight characteristics, providing the pilot with the necessary tools to effectively manage rotor blade movement and ensure stable flight.

In this context, the other control systems mentioned do not function in the same way. The yaw control system deals with tail rotor adjustments to manage the helicopter's rotation around its vertical axis, while the aileron and rudder control systems are more applicable to fixed-wing aircraft rather than rotary-wing flight.