Algodoo

Just made this out of boredom (crappy summer weather).

Simple cross section of a ship with some general parts.

On the left you can play with the balance (stability) of the ship, the 8 blue shapes in the bottom of the ship are the balast tanks. The 8 blue rectangles on the bottom are there just to put some text in. The two ships are not linked. If you change a weight in the left model you will have to change the right model manually as well.

Liquify the boxes to start! Each block is 2000 water particles, 4 should be enough to (just) get the ship afloat. Arrows Up and Down to open the "door".