- Attack.
- Dihedral.
- Incidence.
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Attack.
(The angle of attack is always defined as the angle between the chord line and the relative wind. This definition needs to be committed to memory. The angle of dihedral does not exist. The angle of incidence is the angle between the chord line and the longitudinal axis of the aircraft. It is a fixed number and does not change in flight. See “Stalls” video for more information. )