In a helicopter, the collective control is used primarily to adjust what?

The collective control in a helicopter is primarily used to adjust altitude. It alters the pitch angle of the main rotor blades collectively, effectively increasing or decreasing the lift produced by the rotor system. When the collective is raised, the rotor blades pitch increases, generating more lift and allowing the helicopter to ascend. Conversely, lowering the collective decreases the pitch angle and lift, resulting in a descent.

This fundamental control directly influences the helicopter's vertical flight path, making it a critical component for altitude management. Understanding the role of the collective is essential for pilots, as it is vital for maintaining controlled flight and managing changes in altitude effectively.