Which term defines the blade pitch angle with respect to the rotor plane, not the angle of attack?

Which term defines the blade pitch angle with respect to the rotor plane, not the angle of attack?

• A. Pitch Angle
• B. Angle of Attack
• C. Bank Angle
• D. Yaw Angle

Answer: (A)

Pitch angle is the orientation of the blade around its own axis measured relative to the rotor plane. It’s the angle you adjust with the collective to change lift, and it stays referenced to the rotor plane itself. Angle of attack, on the other hand, is the angle between the blade’s chord line and the oncoming air (relative wind), which changes with airspeed and rotor downwash and determines how much lift is produced at a given pitch. Bank angle and yaw angle describe the helicopter’s attitude and heading, not the blade’s orientation. So the term that defines the blade pitch angle with respect to the rotor plane is pitch angle.

Pitch angle is the orientation of the blade around its own axis measured relative to the rotor plane. It’s the angle you adjust with the collective to change lift, and it stays referenced to the rotor plane itself. Angle of attack, on the other hand, is the angle between the blade’s chord line and the oncoming air (relative wind), which changes with airspeed and rotor downwash and determines how much lift is produced at a given pitch. Bank angle and yaw angle describe the helicopter’s attitude and heading, not the blade’s orientation. So the term that defines the blade pitch angle with respect to the rotor plane is pitch angle.