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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°.

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°. Correct Answer 13Nm

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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