Definition 1 of 2
Plain English Meaning
When one wing (or one side of a helicopter rotor) is producing more lift than the other, so the aircraft tends to roll toward the side producing less lift.
Full Definition
A condition in which the lift produced by one wing, or one side of a rotor disc, is greater than the lift produced by the other. In fixed-wing aircraft this typically occurs during a stall when one wing stalls before the other, causing the aircraft to roll toward the stalled side. In helicopters, asymmetrical lift refers to the unequal lift produced between the advancing and retreating blades of the main rotor in forward flight, which is compensated for by blade flapping.
Context Anchor
Encountered in helicopter aerodynamics, especially when learning how the rotor behaves as the helicopter gains forward .