What is the main function of a control stick in helicopters?

The main function of a control stick in helicopters is to control pitch, roll, and yaw. The control stick, often referred to as the cyclic, allows the pilot to manipulate the aircraft's attitude and direction of flight. By tilting the control stick in different directions, the pilot can change the pitch angle, which affects the helicopter's climb or descent, and the roll angle, which allows for lateral movement. This control also has an indirect effect on yaw, as the different rotor dynamics come into play when initiating a turn.

Through this triad of movements—pitch, roll, and yaw—the pilot is able to adjust the helicopter's flight path and maintain stable flight. Unlike other controls that have specialized functions, the control stick is fundamental to the helicopter's maneuverability and is essential for flying in various conditions. This comprehensive control over the helicopter's three axes is what makes the control stick a critical component of helicopter flight operations.