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At idle cruise condition, thrust loading is equal to ______(a) drag to lift ratio at cruise(b) drag to power ratio(c) lift to drag ratio(d) aerodynamic efficiencyThe question was posed to me by my school teacher while I was bunking the class.The origin of the question is Thrust Weight Ratio-2 topic in chapter Thrust-Weight Ratio and Wing Loading of Aircraft Design

Answer»

Correct answer is (a) drag to lift RATIO at CRUISE

Explanation: At IDLE cruise CONDITION, lift = weight and thrust = drag. Hence, thrust loading T/W = D/L = Drag to lift ratio at the cruise. Aerodynamic efficiency is the ratio of lift to drag. Thrust loading at cruise is inverse of aerodynamic efficiency.



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