I'm part of the Western Martial Arts/Historical European Martial Arts community, and a debate that often comes up is parrying with the edge vs parrying with the flat of a blade. I want to do some calculations myself to really convince myself one way or another.
Specifically what I'm looking to do is to calculate the moment of inertia tensor of a highly idealised sword (basically just the blade, tang and pommel treated as two rectangular prisms and a sphere) about some pivot.
My intention is to calculate the moment of inertia of each body individually, and find a way to sum them together; does the parallel axis theorem apply to the tensor quantity, or only to the scalar quantity? It is likely that the pivot point will not be about the principal axes.