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Abstract
With the structure of detachable blades fitted to the hub with bolts, the bolts of controllable pitch propeller are very important. The tightening force of the bolt group directly affects the durability, working ability, and reliability of the propeller. The tightening force generally depends on external loads. However, the loads acting on the blade bolt group are extremely complex. They include the forces and moments caused by the pressure distribution field on the propeller blade. In this paper, the authors propose a method to determine the effective load and calculate the necessary tightening force for the bolts of a built-up propeller. Applying for the calculation of the propeller of the ship with the main engine capacity of 155CV and the propeller