I caught my Uboat dancing like Shakira

[dcb]

Originally Posted by Ducimus

The excessive roll, might be from the CG_Height in the sim file.

This is one of those variables that is a double edged sword. Too little and things are flat and the boat wont roll with the waves very much when surfaced. Too much and their over the top, and you end up, upside down.

First thing that comes to my mind is to tone it down via the drag variable. Leave the GC rather high, for a nice roll&pitch while surfaced, but set the drag very low surfaced and high while submerged, to act like some sort of inertia. Haven't tested it, though.