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Increment in the skin friction drag due to prop-wash is called _________

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in Aircraft Design by (701k points)
Increment in the skin friction drag due to prop-wash is called _________

(a) scrubbing drag

(b) vortex

(c) swirl

(d) curling flow

The question was asked during an online interview.

Asked question is from Aerodynamic Forces in portion Aerodynamics of Aircraft Design

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Best answer
Correct answer is (a) scrubbing drag

The best I can explain: Scrubbing drag is drag produced due to Increment in skin friction drag as a result of prop wash. Vortex is produced due to pressure difference. Swirling is nothing but the turning of flow. Curling of flow can be seen as change in direction of flow.

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