What is the term for the lift differential between the advancing and retreating rotor blades of a helicopter?

The term that describes the lift differential between the advancing and retreating rotor blades of a helicopter is known as dissymmetry of lift. This phenomenon occurs because the advancing rotor blades experience higher relative wind speeds, generating more lift compared to the retreating blades, which face a decreased relative wind speed as they move away from the direction of flight. This difference in lift is a crucial factor in helicopter flight dynamics, especially during maneuvers such as turns and vertical climbs.

Understanding dissymmetry of lift is essential for pilots and engineers, as it influences the stability and control of the aircraft. If not managed properly, this differential can lead to adverse effects on the helicopter's performance, such as the potential for a loss of control if the rotor blades are not appropriately balanced during operation.

The other terms, while related to aviation and lift dynamics, do not accurately describe this specific phenomenon. Lift distribution refers to how lift is spread across the rotor blades but does not specifically address the differential experienced in forward flight. Directional lift involves the component of lift acting perpendicular to the flight path but does not account for the behavior of advancing and retreating blades. Dynamic lift relates to the lift generated while the helicopter is in motion but is not specific to the differential between the