Decalage
Decalage
Aeronautical engineering measurement
Decalage on a fixed-wing aircraft is a measure of the relative incidences of wing surfaces. Various sources have defined it in multiple ways, depending on context:
- On a biplane, decalage can refer to the angle difference between the upper and lower wings, i.e. the acute angle contained between the chords of the wings in question.
- On other fixed-wing aircraft, decalage can refer to the difference in angle of the chord line of the wing and the chord line of the horizontal stabilizer. This is different from the angle of incidence, which refers to the angle of the wing chord to the longitudinal axis of the fuselage, without reference to the horizontal stabilizer.