Which term describes the difference in lift between the retreating and advancing blades of a helicopter?

The term that describes the difference in lift between the retreating and advancing blades of a helicopter is dissymmetry of lift. In a helicopter, the rotor blades experience different airflow and lift characteristics as they rotate. The advancing blade moves into the wind and generates more lift due to the increased relative airflow. Conversely, the retreating blade moves with the wind and generates less lift. This imbalance in lift is what creates dissymmetry of lift, leading to challenges in helicopter control and stability.

Understanding this concept is essential for pilots, as they must manage the effects of dissymmetry of lift, particularly during maneuvers that involve changes in speed and direction. Proper management ensures effective and safe helicopter operations, especially in maintaining level flight and responding to various flight conditions.