SVN solovelanet: rivista digitale dedicata al mondo della vela. Articoli di navigazione, di nautica e barche a vela
Issue link: http://svn.uberflip.com/i/1250934
73 SVN Solovelanet Global Fire damage always requires very heavy and ex- pensive remedial works. b) Sinking: if the accident occurs in fairly shallow water and the hull is retrieved quickly, within one to seven days, the resulting damage, beyond the damage that caused the sinking, is always seve- re but repairable without consequences. c) Stranding: stranding is an accident that, if occurring at high speed (3 knots or more), may cause severe damage that is not always per- fectly repairable, at a cost that is justified by the value of the craft. d) Grounding on sand: grounding on sand is a particular sort of stranding because it occurs on sand but, contrary to what is thought, it may also cause serious damage in some cases. Above all, grounding on sand should be feared as a consequence of the fall in the trough of a wave near the mouth of a river where a sand bar is created. In these cases, the blow is always violent and the consequences may be severe. e) Collision: although it is a rare accident, col- lision may occur with emerged objects, such as other boats, or with semi-submerged or comple- tely submerged objects a few centimetres from the surface, such as containers or gas cylinders. Speed plays an important role in collisions too: the higher the speed, the greater the damage. In this as well as in the other cases, damage may reach an extent that does not justify repair. f) Damage caused by falling: in case of heavy we- ather, big tornadoes or sea storms, boats can fall from their cradles and the resulting damage may be severe. Damage analysis In addition to damage caused by the above men- tioned accidents, there is also damage caused by neglect or resulting from poor construction. Let's see some sorts of damage that may be found on a used boat during the survey, and how we should behave. 1) Delamination: delamination is serious damage that may be caused by one or more collisions or, even worse, by poor lamination during construc- tion. The surveyor uncovers delamination by tap- ping the boat. During the inspection, the surveyor will tap the whole hull with a rubber-headed hammer in order to percei- ve the difference in sound between areas. On top, a collision du- ring a race. Aside, a mast damaged by a fall from the cradle. Below, two bo- ats have fallen one on top of the other because of a strong wind