Editing Magnus effect (section)

===Kutta–Joukowski lift===
[[File:Magnus-anim-canette.gif|thumb|The topspinning cylinder "pulls" the airflow up and the air in turn pulls the cylinder down, as per Newton's third law]]
On a cylinder, the force due to rotation is an example of [[Kutta–Joukowski theorem|Kutta–Joukowski lift]]. It can be analysed in terms of the vortex produced by rotation. The lift per unit length of the cylinder <math> L^{\prime}</math>, is the product of the freestream velocity <math> v_{\infty}</math>, the fluid density <math> \rho_{\infty}</math> and circulation <math> \Gamma</math> due to viscous effects:<ref name="Glenn" />

:<math> L^{\prime}= \rho_{\infty} v_{\infty} \Gamma,</math>

where the vortex strength (assuming that the surrounding fluid obeys the [[no-slip condition]]) is given by

:<math>\Gamma = 2 \pi \omega r^2</math><ref name="Glenn" />

where ''ω'' is the angular velocity of the cylinder (in rad/s) and ''r'' is the radius of the cylinder.