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For wing to be lofted as shown in below figure, what will be the approximated value of MAC?(a) 8m from l.e.(b) 8m from t.e.(c) 12m from l.e.(d) 12m from t.e.I got this question during an internship interview.The question is from Configuration Layout topic in portion Configuration Layout and Loft of Aircraft Design

Answer» CORRECT choice is (a) 8M from l.e.

The best I can explain: Given, Cr=12m, Ct=3m SPAN = 2*20 = 40m

Taper ratio t = Ct/Cr = 3/12 = 0.25.

Location of MAC, γ = (b/6)*(1+2*t) / (1+t) = (40/6)*(1+2*0.25) / (1+0.25) = 40*(1+0.5)/6*1.25 = 8m from l.e.


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