different between aerofoil vs decalage

English

From aero- +? foil.

aerofoil (plural aerofoils)

Britain standard form of airfoil.
- 1907, Aerodynamics, constituting the first volume of a complete work on aerial flight (page 163)
  We may look upon this figure as representing in section a theoretical wing-form, or aerofoil

From French décalage

decalage (countable and uncountable, plural decalages)

(aviation) The difference in angle of incidence between the main wing and horizontal stabilizer, or between the canard and main wing, of an airplane.
(aviation) The difference in angle of incidence of the two wings of a biplane.
(aviation)The angle between two geometric lines that define an aerofoil.
(psychology) In Piagetian developmental psychology, the inability to apply a learned function across all problems (horizontal decalage) or across different developmental stages (vertical decalage).

decalage m (invariable)

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