Question:

I have altered some compartments to improve the stability.  Suddenly the
error: Model part bad: Negative waterplane area.

What can cause waterplane to become negative.



Answer:


The Negative Waterplane error message is usually the result of a deduction
extending outside the boundaries of whatever it is deducting from.  If you can
have a waterplane cutting the model in such a way that it passes through the
deduction and the net waterplane area is negative, you will get this error
message.

When there is flooding, the flooded spaces deduct from the hull.



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