Dietz gen Credo sooner’s Post

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Marinia Qatar

An escort tug stopping an oil tanker in an “arrest drill”. The tug operators have worked out a special manuever to stop an out-of-control tanker when it is moving at over 5 knots - rather than use direct propeller power to slow and stop the tanker, the tug turns perpendicular to the tanker’s course. When the tug has turned 90 degrees to the motion of the ship, the water resistance of the skeg - the flat fin on the bottom of the tug - produces enormous stopping power. This allows the tug to slow the tanker from full speed to a dead stop within the length of the tanker. This drawing is a part of a project aimed at showcasing the measures for preventing and responding to oil spills, which were developed following the devastating 1989 Exxon Valdez disaster. The project was initiated by the Prince William Sound Regional Citizens’ Advisory Council, which is responsible for overseeing oil industry activities in the vicinity of the Valdez, Alaska pipeline terminal. EDIT: Some professinals have noted that stopping the ship within its own length is unrealistic, and I have confirmed with the operators that it takes more time and distance that that to stop the ship. I stand corrected. courtesy

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