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Having a different zero angle of attack along span-wise locations is termed as______

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Having a different zero angle of attack along span-wise locations is termed as______

(a) Washout

(b) Geometric twist

(c) Aerodynamic twist

(d) Washin

I have been asked this question in an online interview.

Enquiry is from The Vortex Filament, the Biot-Savart Law, Helmholtz Theorem topic in section Flow over Airfoils over Finite Wing of Aerodynamics

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The correct answer is (c) Aerodynamic twist

For explanation: For a finite wing, the zero lift angle of attack can vary along the span-wise direction for different airfoil sections. This condition is known as aerodynamic lift.

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