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The coefficient of skin-friction drag coefficient Cf, as conventionally defined, when used gives half the value of total drag.

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The coefficient of skin-friction drag coefficient Cf, as conventionally defined, when used gives half the value of total drag.

(a) True

(b) False

I have been asked this question by my college professor while I was bunking the class.

My enquiry is from Laminar Flow in chapter Incompressible Flow over Airfoils of Aerodynamics

1 Answer

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Right choice is (a) True

The explanation is: The skin- friction coefficient Cf, has been defined for the skin-friction drag over one surface only. So in order to calculate total drag, we need to multiply the result by 2.

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