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Old 04-04-2017, 01:26 PM
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Think of the plane as a teeter-totter. When the plane is flying, the fulcrum of the teeter-totter is the CG, there is equal weight on both sides of the fulcrum, and the plane flies level. When the plane is on the ground, the fulcrum of the teeter-totter is the main wheels, there is now more weight behind the fulcrum than in front and, consequently, the tail drops to the ground. The further the main wheels are ahead of the plane's CG, the greater the weight behind the fulcrum and thus the heavier the tail is.