How do I simulate rotation about a non inertia principal axis. I am designing a self trimming free roatating wing sail for a catamaran. The wing sail is subject to boat motion but is an asymterical object restrained to rotate about a non principal axis. Refer

http://WWW.redradish.Co.NZ/2018/05/06/turning-moments

I wish to use MSPhysics to demonstrate that the wing sail not only needs to be statically balanced about its mast axis but also dynamically balanced i.e. weights added to make the mast axis an inertia principal axis.

I suspect scripting should make this possible

I am a newbie modelling a rotating object about an axis fixed to a tilting plane. By default MSPhysics is ignoring the off diagonal products in the inertia tensor. How do I go about scripting so that all products in the inertia matrix are used for my rotating object?