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The steamship why against the current dock
2012-12-01 12:00:00
We all know that the steamboat Why always against the current dock it? Is based on what principle? Bicycle brakes, cars and trains have brakes, but you know that the ship "brake"? If you sail across, you will find a very interesting phenomenon: whenever the ship to shore, always should bow wore water slowly to the pier ramp crossing, then docked smoothly. The river is more anxious, this phenomenon is more obvious. You can pay attention to the next: in the Yangtze or other large river downstream vessels under when they get to shore, but not immediately dock, should a detour boat traveling against the flow direction, slowly places to dock.

Simple arithmetic here, you may wish to do a do: If the speed of the water flow is three kilometers per hour, when the ship was to dock, the engine has stopped, its speed of four kilometers per hour, sailing this time if this only ship hour walk a few kilometers? if against the current it? maybe blurting on the above subject A, that is: down the river, the boat line 7 km; countercurrent hour boat line 1 km per hour. Since the purpose is to make the boat stopped, what is 7 km fast easy to stop, or one kilometer so slow and easy to stop it? Course, the slower the more easily docked.
 
Seems so ships against the current near the pier, you can take advantage of the resistance of the water on the hull of the sky part of the "brake" effect; addition, the ship is also equipped with the brake equipment and power, for example: when the ship docked or running the way of an emergency situation, the urgent need to halt, you can anchor while the ship hosts can also turns the clock back to play a role of "brake".