Mandatory parts are available to allow ships to move. These parts facilitate the movement of the ship or are one of the most important elements of the movement of the ship. The propeller is an important part of the ship's movement. They enable the ship to move forward or backward through the machine. These parts are made up of two or more wings arranged at the end of a machine-rotatable shaft. Without this equipment, the movement of the ship is not possible. Damage to these parts during ship movement will reduce the ship's ability to move. The robustness of these parts also affects the speed of the ship. These parts, which directly affect the speed of the ship, should be repaired immediately if they are damaged during ship movement.