The progress of propeller blades, relying only on the intuitive reasoning of experts, can no longer meet the needs of the development of ship technology. It needs scientists to make a complete explanation of its hydrodynamic characteristics, which will promote the development of propeller theory.

The change process of propeller blade tension with speed is as follows: as the engine output power increases, the propeller speed (tangential speed) rapidly increases to a certain value, and the propeller tension increases. In the process of ship technology development, the design and research of propeller blades has done more than any other professional field, from empirical methods to digital design, and then to the design of optimization of propeller blades by using computer technology. The blade angle of the propeller should gradually increase from the tip to the root according to a certain rule.