PPL(H) Principles Of Flight Practice Questions - UK CAA PPL(H) Theory - Principles Of Flight Helicopter Exam

What is the definition of the pitch angle (angle of incidence) of a main rotor blade aerofoil section?

The angle between the rotor blade chord line and the plane of rotation (rotor hub reference plane) The angle between the rotor blade chord line and the relative airflow The angle between the longitudinal axis of the helicopter and the horizon The angle between the tip-path plane and the horizon

Correct Answer:

The angle between the rotor blade chord line and the plane of rotation (rotor hub reference plane)

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