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At idle cruise condition, thrust loading is equal to ______

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in Aircraft Design by (700k points)
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 efficiency

The 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

1 Answer

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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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