Yes, the whole system is freely floating. No, Its not what I expect for the position of the piston. The mass center of the piston is (0,0,165 mm), the height of the piston is 20 mm, diameter is 96 mm. When I only model the piston with the same location (submerged) I got meaningless position. Time step is 0,001 s, and I diactivated RotZ
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