| 摘要 |
PROBLEM TO BE SOLVED: To visually judge the damage or pollution level of a propeller and to facilitate a maintenance plan by arranging a pipe of a proper size above the propeller of a hull to above a draft line, providing a flange at the upper end of the pipe, covering it with a reinforced glass, and bleeding the inside air with a bleeding device. SOLUTION: An observation pipe is normally filled with air to prevent a water hammer by waves, the sticking of marine organisms and the intrusion of refuse such as floating objects into the observation pipe. Bubbles around a propeller 3 tend to stagnate in the pipe during navigation, a reinforced glass is not directly applied with the water hammer by waves. When the air in the pipe is bled by a bleeding device, the sea surface rises to the reinforced glass of an observation hole 1, and the surrounding of the propeller 3 can be visually observed. When there is some fear for the occurrence of torque rich of the propeller 3 or the entanglement of a net or a rope during navigation, the propeller 3 and its surrounding can be directly confirmed easily without relying on the dangerous work such as diving. |
