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An A/C is cruising with thrust to weight of 0.9. If A/C is powered by prop engine then, find maximum lift to drag?(a) 1.11(b) 2.11(c) 3.12(d) 4.221The question was posed to me during a job interview.The origin of the question is Thrust Weight Ratio-2 in division Thrust-Weight Ratio and Wing Loading of Aircraft Design

Answer» RIGHT CHOICE is (a) 1.11

For explanation: Given, thrust LOADING at CRUISE T.L. = 0.9, prop aircraft.

For prop aircraft maximum L/D = Cruise L/D

Hence, T.L. = D/L.

Hence, cruise L/D = 1/(T/W) = 1/0.9 = 1.11.


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