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Find the approximate value of wetted area Swet for given reference area of Sref=20 unit and parasite drag coefficient of 0.0028. Consider equivalent skin friction coefficient Cf as 0.003.

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Find the approximate value of wetted area Swet for given reference area of Sref=20 unit and parasite drag coefficient of 0.0028. Consider equivalent skin friction coefficient Cf as 0.003.

(a) 18.67 unit

(b) 12 unit

(c) 20 unit

(d) 65 unit

I got this question in semester exam.

My question is from Aerodynamics topic in section Aerodynamics of Aircraft Design

1 Answer

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Right choice is (a) 18.67 unit

The explanation: Wetted area Swet = Parasite drag coefficient*Sref/Cf

= 0.0028*20/0.003 = 18.67 unit.

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