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Jet transport aircraft has 12m length of the fuselage. What will be the approximated value for take-off gross weight?(a) 820.68kg(b) 850kg(c) 520kg(d) 1025gI had been asked this question in an online quiz.This key question is from Geometry Sizing topic in portion Initial Sizing of Aircraft Design

Answer»

Right answer is (a) 820.68kg

Best EXPLANATION: GIVEN, length L=12m

Now, length is given by,

L = a*W0^c

Now, for jet TRANSPORT aircraft a=0.67, c=0.43

Hence, take-off gross weight is W0^c = L/a

W0^0.43 = 12/0.67 = 17.91.

Now by taking log at both side,

0.43*LN W0 = ln17.91 = 2.885

lnW0 = 6.710

Hence, by USING antilog,

W0 = e^6.710 = 820.68kg.



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