Reckoning / Ship
Room · wave 4
Ship
A ship is a girder that floats. This room takes one apart: the named pieces of its hull, the arithmetic of floating and loading, and the geometry that decides whether a ship that has been pushed over comes back upright.
The hull, piece by piece
A midship section with every part named: keel, strakes, floors, frames, beams, knees and the rest.
Buoyancy and the load line
Displacement, tonnes per centimetre, fresh-water allowance, and the load-line mark drawn to the Convention’s measurements.
Stability
Load a hull and watch G, B and M, the righting lever and the IMO criteria. Computed from the hull’s own shape.