Longitudinal dihedral (decalage) is:
- The angle of sweepback between the wing leading edge and a line perpendicular to the fuselage centreline
- The upward angle of the wings relative to the horizontal, which provides lateral roll stability in a sideslip
- The difference in angle of incidence between the wing and the tailplane — it contributes to longitudinal stability
Explanation
Longitudinal dihedral, or decalage, is the difference in angle of incidence set between the wing and the tailplane, and this rigging difference helps establish the restoring pitching behaviour that contributes to longitudinal stability. It is a pitch-axis geometry term, distinct from wing sweepback and from the wing dihedral that provides lateral roll stability.
kspyroglou asking:
Please explain. Thank you
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