1.

Find the appropriate value of pitching moment coefficient derivative if lift curve slope is 0.032 per degree and Xcg is 0.3. Consider neutral point is located at 60 % of chord from leading edge.(a) -0.0096 per degree(b) -7 per degree(c) 2.56 per degree(d) 0.1I had been asked this question by my college director while I was bunking the class.Question is taken from Longitudinal Static Stability and Control-2 topic in chapter Stability, Control, and Handling Qualities of Aircraft Design

Answer»

The correct CHOICE is (a) -0.0096 PER degree

Explanation: Given, LIFT CURVE slope C= 0.032 per degree, Xcg = 0.3

Neutral point is located at 60% of chord i.e. Xnp = 0.6.

Pitching MOMENT derivative = -C*[Xnp-Xcg] = -0.0032*[0.6-0.2] = -0.0096 per degree.



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