Aërial Locomotion, With a Few Notes of Progress in the Construction of An Aërodome
Aërial Locomotion, With a Few Notes of Progress in the Construction of An Aërodome
Cyrus Adler
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Bottom view. 4. Top view so that there would be no tendency to a recovery of position, but the very re- verse. The pressure of the wind would tend to increase the tipping action and favor the production of oscillation and a tendency to upset. The lifting power of the wind upon a surface inclined at 10° is less than at 20°, and greater at 25° than 20°. The more the wings are opened out and the flatter they be- come, the more essentially unstable is the arrangement in the air. Mow suppose the win...gs to be raised until they are nearly closed, or at all events till they make a small angle with the vertical (say 70° from the horizon- tal), then, if from any cause the cell should tip so as to elevate one wing (say to 75°) and depress the other (say to 65°), the lifting power of the wind will be increased upon the de- pressed wing and diminished on the elevated wing ; for the lifting power of the wind is greater at 65° than at 70° and less at 75°. Thus the moment a tipping action begins the pressure of the wind resists it, and an active force is invoked tending to restore the struc- ture to its normal position.
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