Discussion
Assertion (A): Thin airfoil theory predicts zero drag for an airfoil.
Reason (R): Thin airfoil theory neglects the viscosity of the fluid.
Select the correct answer from the options below.
Answer: C
Both statements hold and the neglect of viscosity is precisely why no drag appears: without shear there is no friction drag, and without a boundary layer there is no separation to spoil pressure recovery. This is d'Alembert's paradox.
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