Aviator168
Well-Known Member
Is the usage approximation good enough for lift analysis? I noticed the following approximation is for elliptical wings. Are there counter parts for other wing types?
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A useful approximation is that
where
is 2
. Note that this equation becomes the thin airfoil equation if AR goes to infinity.[9]
Lifting-line theory also states an equation for induced drag:.[10][11]
where
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A useful approximation is that
-
is the 3D lift coefficient for elliptical circulation distribution,
-
is the 2D lift coefficient slope (see Thin Airfoil Theory),
-
is the aspect ratio, and
-
is the angle of attack in radians.
Lifting-line theory also states an equation for induced drag:.[10][11]
-
is the drag coefficient for induced drag,
-
is the lift coefficient, and
-
is the aspect ratio.
-
is the planform efficiency factor (equals 1 for elliptical circulation distribution).
