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An aircraft is cruising with lift coefficient of 2.5 and thrust loading of 0.6. Find drag coefficient of the aircraft.(a) 1.5(b) 2.5(c) 2.6(d) 2.59This question was addressed to me during an online exam.The origin of the question is Thrust Weight Ratio-1 topic in division Thrust-Weight Ratio and Wing Loading of Aircraft Design

Answer»

The correct CHOICE is (a) 1.5

For EXPLANATION: Given, lift COEFFICIENT CL = 2.5, THRUST loading T/W = 0.6.

Now, thrust loading at CRUISE is given by,

T/W = CD / CL

0.6 = CD / 2.5

CD = 0.6*2.5 = 1.5.



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