Considering the overall requirement of the propeller for a vertical takeoff and landing (VTOL) small unmanned air vehicle (SUAV)

the difficulty of propeller design with two operating points was analyzed; the designed requirement of propeller performance was verified; the effect of two operating points on the propeller performance was studied; and the instructive conclusions were finally obtained. With CFX software as a tool

hovering and cruising models were calculated and compared with the results of truckmounted experiment. It showed that the propeller can meet the need and the results of simulation agree with the experiments basically with errors less than 11%. The effect of two operating points and the parameters were analyzed through comparison between the designed propeller and the propeller with single operating point. The results show that the performance reduction happens in relation to two operating points

and reducing the total weight and cruise velocity

or increasing number of propulsion and power to decrease the difference between two points can facilitate the design and reduce the performance loss.