What causes the phase lag between the displacement and the flapping of a rotor blade?

Question

PPL(H) - Private Pilot License - Principles of Flight (Helicopter) - What causes the phase lag between the displacement and the flapping of a rotor blade?

QuizVDS · Accepted Answer

Inertia, mass, and aerodynamic forces

QuizVDS · Answer

Rounding of the rotor blade tips

QuizVDS · Answer

Friction in the rotor blade spindles

QuizVDS · Answer

Advance or retreat angle of 90°

PPL(H) EN: What causes the phase lag between the displacement and the flapping of a rotor blade?

Question 673, Principles of Flight (Helicopter) - PPL(H) - Private Pilot License

PPL(H) EN: What causes the phase lag between the displacement and the flapping of a rotor blade?

Question 673, Principles of Flight (Helicopter) - PPL(H) - Private Pilot License

Explanation: What causes the phase lag between the displacement and the flapping of a rotor blade?