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An aircraft has L/D as 12 and thrust required at this value is 100N. Now if L/D has doubled then what will be the new thrust required?(a) 50N(b) 500N(c) 100 N(d) 12.5NI had been asked this question in a national level competition.This is a very interesting question from Flight Mechanics in division Performance and Flight Mechanics of Aircraft Design

Answer» CORRECT option is (a) 50N

Explanation: Given, 1: L/D = 12 and thrust required T1 = 100N

Now, L/D is doubled. Hence, new thrust required T2 = T1*(old L/D) / (New L/D)

= 100*12/2*12 = 100*12/24 = 50N.


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