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Old 05-19-2011
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OK another thought experiment.
Imagine a large tank with a consistent artificial current flowing through it.
Now imagine a model boat placed in this stream, bow upstream.
You hold one finger against the center of the transom so the boat is stationary over ground.
With this model I thing it is pretty easy to see that keeping it perfectly balanced would be very hard. The bow will want to fall off very easily and quickly.
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