GATE 2021 AE – Question 23
Flight Mechanics & Space Dynamics · Static stability: stability and control derivatives, longitudinal, directional and lateral stability, hinge moments and stick forces · 1 mark · Multiple choice
The shown pitching-moment coefficient versus angle-of-attack plot indicates
- positive trim angle and stable equilibrium
- positive trim angle and unstable equilibrium
- negative trim angle and stable equilibrium
- negative trim angle and unstable equilibrium
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Show answer and explanation
Correct answer: (B) positive trim angle and unstable equilibrium
Explanation
The positive zero-crossing gives positive trim angle of attack. The positive moment slope is destabilizing.