Question

If an aircraft has lift curve slope of 4.76 per rad and moment coefficient curve slope of -0.116 per rad then, find the location of neutral point. Consider Xcg=0.3.

(a) 0.324

(b) 0.9825

(c) 23.45

(d) 45.7

This question was posed to me in an interview for internship.

My enquiry is from Longitudinal Static Stability and Control-2 in division Stability, Control, and Handling Qualities of Aircraft Design

Answer 1

Correct answer is (a) 0.324

For explanation: Location of neutral point = Xcg – moment coefficient slope/lift curve slope

= 0.3 – 0.116/4.76 = 0.3-0.024 = 0.324.