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A condition in which the wing has different values of α along the span is called as ______

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A condition in which the wing has different values of α along the span is called as ______

(a) Washout

(b) Geometric twist

(c) Aerodynamic twist

(d) Washin

The question was posed to me at a job interview.

This is a very interesting question from The Vortex Filament, the Biot-Savart Law, Helmholtz Theorem topic in portion Flow over Airfoils over Finite Wing of Aerodynamics

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Correct option is (b) Geometric twist

The best I can explain: Some wings are twisted i.e. they have different geometric angle of attack at different places along the span-called geometric twist. The other terms do not mean the same.

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