Practice Quiz

FAA Private Pilot Test Prep

Category - FAA Private Pilot

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The lift differential that exists between the advancing main rotor blade and the retreating main rotor blade is known as
  1. P factor
  2. Dissymmetry of lift
  3. Ground effect
  4. Transverse flow effect
Explanation
Correct answer: B. Dissymmetry of lift. When a helicopter is stationary in a hover there is no extra movement of air across the rotor blades. However, when moving forward through the air the advancing blade will have an extra relative speed because of the movement of the air as the helicopter moves forward. This causes the advancing blade to produce more lift and the retreating blade to produce less lift.
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