|b ) boat
If the weight of the motor bikes or the cars is perfectly known , it should be admitted that the weights of the machines or the boats:
- are often underestimated (theoretical weight "engineering and design department"), even false or not updated after modifications,
- take into account neither additional accessories, limp with tools, full tanks for the engines… neither balconies, anchors or additionnal chains, neither engine of help, and even less the luggage in the boat!
See - > Examples of noted weight variations or of densities (below)