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The place where the airplane balances. It can vary, because fuel, passengers, cargo and so forth can be put in various places.

If the center of gravity is too far from the ideal location (out of limits) the aircraft will not handle properly, and may not fly at all. Worse, it may get into the air and then become uncontrollable. Failure to properly calculate and adjust CG has killed many pilots and their passengers. The aircraft has to "Balance" all the forces of Lift and Weight. The tail control surfaces (on typical aircraft) are used to balance the aircraft a small amount. The Center of Lift is usually located about 1/4 the width of the wing airfoil, measured from the nose of the wing. The Center of Gravity for the weight of the entire airplane and its contents should be close to this same location.

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Q: What is the center of gravity on an aircraft?
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