Dissymmetry of lift is defined as what?

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Prepare for the Theory of Rotary Wing Flight Test. Sharpen your skills with flashcards and multiple choice questions, with hints and explanations for each. Ace your exam with confidence!

Multiple Choice

Dissymmetry of lift is defined as what?

Explanation:
Dissymmetry of lift describes the unequal lift experienced by the two halves of the rotor disk in forward flight: the advancing blade, moving into the oncoming air, sees a higher relative wind and generates more lift than the retreating blade, which moves with the air and has a lower relative wind. This difference exists across the disk because lift depends on relative airspeed, which varies with blade azimuth as the helicopter moves forward. The rotor system then responds (through flapping and cyclic pitch) to balance this imbalance. So the correct description is the differential (unequal) lift between advancing and retreating blades.

Dissymmetry of lift describes the unequal lift experienced by the two halves of the rotor disk in forward flight: the advancing blade, moving into the oncoming air, sees a higher relative wind and generates more lift than the retreating blade, which moves with the air and has a lower relative wind. This difference exists across the disk because lift depends on relative airspeed, which varies with blade azimuth as the helicopter moves forward. The rotor system then responds (through flapping and cyclic pitch) to balance this imbalance. So the correct description is the differential (unequal) lift between advancing and retreating blades.

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