Decalage on a fixed-wing aircraft is the angle difference between the wing and the tailplane, and between the upper and lower wings of a biplane, i.e. the acute angle contained between the chords of the wings in question.
DECALAGE - The difference in angular settings [Angles of Attack] of the wings of a biplane or multiplane.
Decalage. Decalage is the angle between the chord line of the upper plane and that of the lower plane and is positive when the top plane is at a greater angle of incidence than the bottom.
Decalage is the main issue but not the only issue affecting the airplane's angle of attack stability. The following points are mentioned only briefly, because they are of more interest to airplane designers than to pilots.
the Longitudinal Dihedral (LD) or decalage.
For a given centre of gravity, there is a LD angle that results in a certain
trimmed flight speed and pitch attitude.
If the LD angle is increased the plane will take on a more nose up pitch attitude, ...
Decalage.-Difference in angle of incidence between any two distinct aerofoils on an airplane.
44. Chord.-Distance between the entering edge and trailing edge of a wing measured on a straight line touching front and rear bottom points of a wing.
45.
 See also: Aircraft, Plane, Wing, Stability, Drag
  
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