A numerical method is used to evaluate the influence of propeller parameters on the aerodynamic performance of shrouded coaxial dual rotors in hover. Compared with the open-rotor configuration. the shrouded rotors reduce the tip vortex. resulting in a higher thrust and figure of merit (FoM). https://www.bekindtopets.com/super-value-Blue-Lotion-Topical-Antiseptic-16-oz-flash-save/