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I will try to answer these questions in terms of structural dynamics. Please correct me if I say dumb things on other parts of my answer. You ask about damping. Damping must be considered when dealing with structural dynamics, or vibratory phenomena. In a helicopter rotor, multiple phenomena can lead to vibrations. For instance : Differences in blade ...


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It has to do with the Birnbaum distribution. The center of its area is at one quarter. In potential flow theory, lift can be calculated as the linear superposition of a contribution from camber and one from angle of attack. While the camber-related part of lift is constant, the angle-of-attack related part varies linearly with this parameter. This means that ...


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Intuitively, the aerodynamic center of a wing is at 1/4 MAC because the lift created by the front top curved surface of the wing and the front bottom of the wing roughly equals the lift created by the back bottom of the wing throughout the range of non-stalled AOA. From this we can deduce that the top of the wing behind MAC is not a major contributor to lift....


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It depends on what position the elevator is in! As long as there's enough back pressure, there's not going to be an issue. If you were to push FORWARD, then the plane would go over onto its nose. I've got some experience with this in X-Plane, and it's definitely possible. If I was involved in a similar engine run-up, I'd want some sort of tie-down on the ...


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