Geodesic
The problem of lift maximization for circle with a vortex in a stream
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 10 (2010) no. 1, pp. 32-34 
E. V. Varsegova. The problem of lift maximization for circle with a vortex in a stream. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 10 (2010) no. 1, pp. 32-34. http://geodesic.mathdoc.fr/item/ISU_2010_10_1_a5/
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Voir la notice de l'article provenant de la source Math-Net.Ru

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.

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