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If thickness ratio t/c is less or equal to the 0.05 then, the wetted area is ____(a) Swet = 2.003*Sexposed(b) Swet = 2.003*4*Sexposed(c) Swet = 2/Sexposed(d) Swet = 2*SexposedI had been asked this question in an interview for job.My question is taken from Configuration Layout in section Configuration Layout and Loft of Aircraft Design

Answer»

The correct answer is (a) Swet = 2.003*Sexposed

Explanation: Thin BODY has thickness TENDS to NEGLIGIBLE. For a paper thin body WETTED area is twice of the EXPOSED or true planform area. However, for finite thickness of t <= 0.05*c wetted area is approximated as Swet = 2.003*Sexposed.



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