As opposed to the displacement hull type, the displacement of a hull, any hull type,
it is the fully loaded weight of the vessel or the weight of volume of water that
the hull pushes aside (displaces) when at rest.
The displacement weight is an important factor in determining a boats power requirement
and subsequently in propeller selection, it is therefore important to have as accurate
a figure for displacement as practical. Boat manufacturers tend to understate displacement
or not give maximum displacement with full payload. Maximum displacement is used
in the calculations on this site, this is the weight of the boat plus, the full
weight of crew, passengers and normal stores and two thirds of fuel and water.
There are three ways to determine displacement: