Fahnenbohn,
probably you noticed, e.g., Le Fantasque is less prone to shaky movements than many stock ships. The reason is that its submerged draught (obj_Hydr -> Submerged ->) is set rather deep.
You may wonder what effect the submerged draught may have on surface ships? As far as I understand, the game engine calculates the vertical position basically according to the standard draught but under unruly conditions (especially when the vessel dives into between waves) it becomes partly submerged. Then the submerged draught comes into play.
The standard SH3 setting for submerged draught is 0 of many vessels (meaning, it es equal to the surface draught); that limits partial submersion. Result: the vessel tends to act as a rubber duck. Small vessels (with shallow draught) are especially sensitive to that.
In short: allowing the vessel to dive a bit helps to make it act a bit more natural.
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