Aerodynamic forces depend on the size, shape and velocity of the object. The density, compressibility, viscosity, temperature, and pressure of the gas also affect these forces.
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At low speeds, the current around the object is in the form of layers or lines and causes low drag resistance. At higher speeds, a complex flow occurs where drift is stronger.
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Stems such as air leaf are applied to maintain the layered flow even at high speeds. All aerodynamic effects are taken into account in aircraft drawings.
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