A wing alone arrangement has wing lift curve slope of 2.65 per rad. Find slope of pitching moment coefficient. Given Xcg = 0.3.(a) 0.025 per degree(b) 0.03 per rad(c) 45 per rad(d) 0.0035 per degreeI have been asked this question in an interview for job.My question comes from Longitudinal Static Stability and Control-1 topic in chapter Stability, Control, and Handling Qualities of Aircraft Design

A wing alone arrangement has wing lift curve slope of 2.65 per rad. Fi

1.	A wing alone arrangement has wing lift curve slope of 2.65 per rad. Find slope of pitching moment coefficient. Given Xcg = 0.3.(a) 0.025 per degree(b) 0.03 per rad(c) 45 per rad(d) 0.0035 per degreeI have been asked this question in an interview for job.My question comes from Longitudinal Static Stability and Control-1 topic in chapter Stability, Control, and Handling Qualities of Aircraft Design
Answer» Right option is (a) 0.025 per degree For EXPLANATION I would say: Considering ideal LOCATION of aerodynamic centre i.e. XAC = 0.25 Slope of pitching MOMENT curve = (wing LIFT curve slope*[Xcg-Xac]) = (2.56[0.3-0.25]) = 0.1325 per rad = 0.00253 per degree.

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