An airfoil with symmetric profile has pitching moment about aerodynamic centre as 13 Nm at 4° AOA. Determine Pitching moment at same point if AOA is increased by 8°.(a) 13Nm(b) 8Nm(c) 5Nm(d) 13NcmThe question was posed to me by my college director while I was bunking the class.The query is from Airfoil Selection-2 topic in portion Airfoil and Geometry Selection of Aircraft Design

An airfoil with symmetric profile has pitching moment about aerodynami

1.	An airfoil with symmetric profile has pitching moment about aerodynamic centre as 13 Nm at 4° AOA. Determine Pitching moment at same point if AOA is increased by 8°.(a) 13Nm(b) 8Nm(c) 5Nm(d) 13NcmThe question was posed to me by my college director while I was bunking the class.The query is from Airfoil Selection-2 topic in portion Airfoil and Geometry Selection of Aircraft Design
Answer» Right option is (a) 13Nm To elaborate: Given, a symmetric airfoil Pitching moment PM1 = 13Nm at AOA = 4°. Now AOA is INCREASED by 8°. HENCE new AOA = 4+8 = 12°. Now PM1 is acting through aerodynamic centre. PM will be independent of AOA at aerodynamic centre. Hence, at 12° pitching moment will not change. Hence, at same POINT at 12° PM2 = PM1 = 13Nm.

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