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Why is the moment at leading edge(LE)=-c/4 times lift + moment at c/4=-position of center of...

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Mechanical Engineering

Why is the moment at leading edge(LE)=-c/4 times lift + momentat c/4=-position of center of pressure times lift? The equationshows like this MLE=-c/4*L+Mc/4=-xp*L. Because moment of leadingedge and moment at center of pressure or moment at c/4 they alwaysact on the wing but why they equal to each other but not like sumthem up? Also, what is neutral point? Is neutral point alwayschange in different situations like flying with different angle ofattack? And why the derivative of moment at c/4 oftime(d(Mc/4)/dt)=0? Is it because moment at c/4 always constant?Thank you so much

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