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Identify the source which does not cause drag on a finite wing.

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Identify the source which does not cause drag on a finite wing.

(a) Skin – friction

(b) Flow separation

(c) Trailing vortices

(d) Power provide by aircraft engine

The question was asked in class test.

This key question is from Downwash and Induced Drag topic in section Flow over Airfoils over Finite Wing of Aerodynamics

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The correct choice is (d) Power provide by aircraft engine

The explanation: The flow over a wing has drag which comes from viscosity (skin – friction drag and pressure drag) plus drag induced by the trailing vortices. The power by the aircraft engine is used to overcome the drag and not cause it.

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