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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 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. Correct Answer 19.3

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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