What does the collective control in a helicopter?

The collective control in a helicopter primarily manages the pitch of the rotor blades. By changing the pitch angle of the rotor blades collectively (i.e., all blades are adjusted simultaneously), the pilot can increase or decrease lift. When the pitch is increased, the rotor blades create more lift, allowing the helicopter to ascend. Conversely, decreasing the pitch reduces lift, enabling the helicopter to descend.

This control is distinct from other flight controls, which govern different aspects of aircraft movement. For instance, yaw is typically controlled by the tail rotor, and roll is influenced by the cyclic control, which allows for lateral movements of the helicopter. Altitude can be adjusted using collective but is a result of changes in lift rather than something controlled directly by a separate instrument. This distinction illustrates the collective's unique role in helicopter operation, emphasizing its critical function in managing altitude through rotor blade pitch adjustments.