✍ Scribed by Orville Weight
No coin nor oath required. For personal study only.
THE subject of " Stability of A~roplanes" is too broad to permit of a discussion of all of its phases in one evening. I shall, therefore, confine myself more particularly to a few phases of the fore-and-aft or longitudinal equilibrium. Although in learning to fly the beginner finds most difficulty in mastering the lateral control, it is his lack of knowledge o.f.certain features of the fore-and-aft equilibrium that leads to most of the serious accidents. These accidents are the more difficult to avoid because they are due to subtle causes which the flyer does not at the time perceive.
A flying machine must be balanced in three directions: about an axis fore and aft in its line of motion, about an axis extending in a lateral direction from tip to tip of the wings, and about a vertical axis. The balance about the lateral axis is referred to as fore-and-aft or longitudinal equilibriurd; that about the foreand-aft axis as lateral equilibrium, and that about the vertical axis is generally referred to as steering, although its most important function is that of lateral equilibrium. * Presented at the stated meeting of the Institute held Wednesday, May 2o, I9x4, when Dr. Wright received the Institute's Elliott Cresson Medal in recognition of the epoch-making work accomplished by him in establishing on a practical basis the science and art of aviation.
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