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Old   April 28, 2010, 10:23
Default moment coefficient
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tom
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Hi, all

I am doing an aerofoil simulation now, why the moment coefficient is always positive? the experimental data that I have is negative. Does anybody have the same problem with me?

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Old   April 29, 2010, 09:42
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Chris
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I think it depends on your coordinate system. From the pilot's perspective, a nose-up pitching moment is positive, but in a right-handed coordinate system, it's negative.
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