But my question is still not answered.
The lighter boat must have less inertia, to beat against the seas in heavy weather and that would lead to a safer boat? I think it would.
On the other hand a light boat, although safer may get tossed around a lot more and therefore be less comfortable?
So is there a balance whereby increased weight can lead to a more comfortable ride?
When the speed is zero then the kinetic energy contained in a heavy or light boat is the same zero but the inertia of the heavier boat is still greater and this may mean that the heavier boat gets tossed about less?
I have not settled this in my mind as yet and would appreciate some comments.