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A jet engine is designed to operate at endurance of 12hrs. If weight fraction is 1.6 and jet engine has tsfc C as 0.00021 per second then, find at which lift to drag ratio that can satisfy above criteria.

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A jet engine is designed to operate at endurance of 12hrs. If weight fraction is 1.6 and jet engine has tsfc C as 0.00021 per second then, find at which lift to drag ratio that can satisfy above criteria.

(a) 19.3

(b) 18

(c) 12

(d) 12.6

The question was asked in homework.

This intriguing question originated from Flight Mechanics topic in chapter Performance and Flight Mechanics of Aircraft Design

1 Answer

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The correct answer is (a) 19.3

To explain: Lift to drag ratio = Endurance*C/ln (weight fraction)

= 12*3600*0.00021 / ln 1.6

= 9.072/0.47 = 19.3.

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