Negative values indicate that the pitching moment is nose-down. By moving the pivot point from the leading edge, along the chord, one can find the point about which the pitching moment is zero. This is the Center of Pressure.

center of pressure

Interesting result: the resultant lift acts through the quarter-chord point. The moment due to the lift acting on the quarter of the airfoil chord ahead of the center of pressure, is enough to balanced by the moment due to the lift acting on the entire three quarters of the chord downstream of the center of pressure. In fact, most of the lift on a thin symmetric airfoil at small angles of attack in low speed flow, comes from the suction peak, located quite near the leading edge.

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