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The laminar boundary layer for a thin airfoil is maximum at_____

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The laminar boundary layer for a thin airfoil is maximum at_____

(a) Leading edge

(b) Trailing edge

(c) Quarter-chord

(d) We can’t say without calculating

I had been asked this question by my school principal while I was bunking the class.

This interesting question is from Laminar Flow in section Incompressible Flow over Airfoils of Aerodynamics

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The correct choice is (b) Trailing edge

The explanation: The boundary layer thickness increases parabolically with the distance measured from the leading edge (denoted by x) for incompressible, laminar flow. Therefore, it is largest at the trailing edge.

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