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For pitching moment coefficient diagram shown below which one will have positive trim AOA?(a) Aircraft 1(b) Aircraft 2(c) Aircraft 3(d) Aircraft 3 and Curve 2 bothThe question was posed to me in an online quiz.This interesting question is from Longitudinal Static Stability and Control-1 topic in division Stability, Control, and Handling Qualities of Aircraft Design

Answer»

The CORRECT answer is (a) Aircraft 1

The best explanation: Pitching moment coefficient curve is shown for 3 different CONFIGURATIONS. To trim at positive AOA, value of zero LIFT pitching moment coefficient Cm0 should be positive. As can be seen in the diagram aircraft 1 has positive value of Cm0. Hence, aircraft 1 will result in trim at positive AOA.



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