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A vortex sheet placed along the chord line gives the best representation for______

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A vortex sheet placed along the chord line gives the best representation for______

(a) Thick Airfoil

(b) NACA Airfoils

(c) Negatively Cambered Airfoil

(d) Thin Airfoil

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I need to ask this question from The Symmetric Airfoil in portion Incompressible Flow over Airfoils of Aerodynamics

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Best answer
The correct option is (d) Thin Airfoil

Easiest explanation: Thin airfoils can be simulated as a vortex sheet kept along the camber line. Thick airfoils cannot be represented like this. Negatively cambered airfoils may or may not be thin and in that case, this representation might be incorrect. NACA airfoils have all types of airfoils, not thin airfoils only.

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