circle The Problem of Lift Maximization for Circle with a Vortex in a Stream Authors: Varsegova Е. V. The key part of the problem lies in finding of vortex position in a stream which would provide the maximum lift of circle. It has been shown that at approaching of a vortex to circle the lift unrestrictedly increases. Read more about The Problem of Lift Maximization for Circle with a Vortex in a Stream