A more serious problem caused by the cg being too far forward is the lack of sufficient elevator authority. At slow takeoff speeds, the elevator might not produce enough nose-up force to rotate and on landing there may not be enough elevator force to flare the airplane. Both takeoff and landing runs will be lengthened if the cg is too far forward.
The basic aircraft design assumes that lateral symmetry exists. For each item of weight added to the left of the centerline of the aircraft (also known as buttock line zero, or bl-0), there is generally an equal weight at a corresponding location on the right.
The lateral balance can be upset by uneven fuel loading or burnoff. The position of the lateral cg is not normally computed for an airplane, but the pilot must be aware of the adverse effects thet will result from a laterally unbalanced condition. This is corrected by using the aileron trim tap until enough fuel has been used from the tank on the heavy side to balance the airplane. The deflected trim tab deflects the aileron to produce additional lift on the heavy side, but it also produces additional drag, and the airplane flies inefficiently.
A more serious problem caused by the cg being too far forward is the lack of sufficient elevator authority. At slow takeoff speeds, the elevator might not produce enough nose-up force to rotate and on landing there may not be enough elevator force to flare the airplane. Both takeoff and landing runs will be lengthened if the cg is too far forward. The basic aircraft design assumes that lateral symmetry exists. For each item of weight added to the left of the centerline of the aircraft (also known as buttock line zero, or bl-0), there is generally an equal weight at a corresponding location on the right.The lateral balance can be upset by uneven fuel loading or burnoff. The position of the lateral cg is not normally computed for an airplane, but the pilot must be aware of the adverse effects thet will result from a laterally unbalanced condition. This is corrected by using the aileron trim tap until enough fuel has been used from the tank on the heavy side to balance the airplane. The deflected trim tab deflects the aileron to produce additional lift on the heavy side, but it also produces additional drag, and the airplane flies inefficiently.
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