dissymetry

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Dissymmetry of lift — in rotorcraft aerodynamics refers to an uneven amount of lift on opposite sides of the rotor disc. It is a phenomenon that affects single rotor helicopters in lateral flight, whether the direction of flight be forwards, sideways or in reverse.… … Wikipedia
Ground resonance — Ground resonance, in fully articulated multi bladed helicopters, is a hazardous condition during touchdown or at other times when the helicopter is running while sitting on the ground. A series of shocks to the landing gear can pass through to… … Wikipedia
Transverse flow effect — is an aerodynamic effect encountered when the helicopter moves (typically forward) through the air.In a hover, the air above the rotor disk is being pulled down from above and is equally distributed around the rotor disk. The air is descending… … Wikipedia

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