The cross-sectional shape of the airplane’s wing is called an airfoil. This animation of the hovering hummingbird was expressed using the basic theorem of voluntary movement of the animals. Now we understand how construction of the natural airfoil by this theorem with trajectory of the organic curve. It is good design for airplane wing, sailboat wing-mast and sail, and paraglider. In this way, many organic curves are able to get by changing a parameters in this theorem. We can also use this theorem in t
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