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Lift coefficient
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Lift coefficient : ウィキペディア英語版
Lift coefficient
The lift coefficient (CL, CN or Cz) is a dimensionless coefficient that relates the lift generated by a lifting body to the fluid density around the body, the fluid velocity and an associated reference area. A lifting body is a foil or a complete foil-bearing body such as a fixed-wing aircraft. ''C''L is a function of the angle of the body to the flow, its Reynold number and its Mach number. The lift coefficient ''c''l refers to the dynamic lift characteristics of a two-dimensional foil section, with the reference area replaced by the foil chord.〔Abbott, Ira H., and Doenhoff, Albert E. von: ''Theory of Wing Sections''. Section 1.2〕
==Definition of the lift coefficient ''C''L==
The lift coefficient ''C''L is defined by〔〔Clancy, L. J.: ''Aerodynamics''. Section 4.15〕
:C_\mathrm L = \rho v^2S}} = } = \frac ,
where
L\, is the lift force, \rho\, is fluid density, v\, is true airspeed, S\, is the relevant plan area and q\, is the fluid dynamic pressure.
The lift coefficient can be approximated using the lifting-line theory,〔Clancy, L. J.: ''Aerodynamics''. Section 8.11〕 numerically calculated or measured in a wind tunnel test of a complete aircraft configuration.

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