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Skin friction drag is defined as _________

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in Aircraft Design by (701k points)
Skin friction drag is defined as _________

(a) drag due to friction between skin and fluid flow

(b) wing lift drag

(c) such drag does not exist

(d) lift induced

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I need to ask this question from Aerodynamic Forces in chapter Aerodynamics of Aircraft Design

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The correct answer is (a) drag due to friction between skin and fluid flow

The explanation is: Skin friction drag is defined as drag caused by the friction between fluid flow and the skin of an object. Skin friction can lead to aerodynamic heating phenomena. Wing lift drag is affected by the lift produced. Lift induced drag is drag which is Induced due to wing lift in finite wing.

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