Yep indeed, I’ve just looked at the drag equation a few minutes ago and it’s pretty much that, but I think it needs applying in the water section instead of air, since water is a magnitude more dense (hah, stupid water).
I’d have to restrict the calculations only to the outer layer and apply the correct surface area to each vector component. Sounds easy for linear velocity, but I’m not sure how it translates to angular. I’ll probably just take the same values.
First things first though, I gotta make it sinkable.