The application of n= 14rps .STARCCM+ in ship rapidity prediction, it is mentioned that the rotation speed of KP505 propeller is n= 14rps, and its diameter is d = 0.25m The propeller refers to a device that converts the rotating power of the engine into propulsion by rotating blades in air or water. There may be two or more blades connected to the hub, and the rear sides of the blades are propellers with helicoids or similar helicoids.