Figure: Angle of Incidence @~copters

Angle of Incidence is a mechanical angle:
~ it is the angle between the >blade chord line and the plane of rotation of the >rotor system
~ in the absence of induced flow and/or aircraft airspeed, >angle of attack and angle of incidence are the same
~ whenever >relative wind is modified by induced flow or aircraft airspeed,
~ then >angle of attack is different than angle of incidence

catch ~>Helicopter ~>Xi ~>Formulas!