GATE_AE_2027_MOCK_01_Q22 GATE 2027 Aerospace Engineering All-India Master Mock 01 (Foundation & Standard Core Calibration) NAT · 1 Mark
Flight Mechanics & Space Dynamics • Atmospheric Flight Mechanics • Drag Polar & Aircraft Performance Equations

A jet aircraft in steady level flight has zero-lift drag coefficient $C_{D0} = 0.018$ and induced drag factor $K = 0.050$. What is the lift coefficient $C_L$ for minimum thrust required (maximum $L/D$)?

Answer Key:
0.6

Step-by-Step Verified Solution

### Solution: Minimum thrust required occurs when $C_{Di} = C_{D0} \implies K C_L^2 = C_{D0} \implies C_L = \sqrt{C_{D0}/K} = \sqrt{0.018 / 0.050} = \sqrt{0.36} = 0.60$. Correct: 0.6.
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