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The surface friction drag coefficient is not effected by reynold’s number effect.

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in Aircraft Performance by (558k points)
The surface friction drag coefficient is not effected by reynold’s number effect.

(a) True

(b) False

This question was posed to me during an internship interview.

This intriguing question comes from Drag Force in division Aircraft Force Systems and the Equations of Motion of Aircraft Performance

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The correct answer is (b) False

The best I can explain: The surface friction drag coefficient is effected by reynold’s number effect. This effect results in the variation of surface friction drag coefficient and mach number. Surface friction drag coefficient decreases slightly as the increase in mach number.

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