Hard ChineAssisting turning and stability: A chine in boating refers to a sharp change in angle in the cross section. Hard chine indicates an angle with little rounding. Soft chine would be more rounded, but still involve the meeting of distinct planes. The oldest type of engineered boats are dugout canoes, which were built by hollowing out a log.These designs generally had rounded bottoms, which made best use of the round shape of the logs. This produced a rounded hull. The first hulls started incorporating hard chines were probably shallow draft cargo carrying vessels used on rivers and in canals. the barge and later the scow used a flat bottom and near vertical sides, which provided the maximum cargo carrying capacity(in both space and displacement) available for a given depth of water. Once sufficiently powerful marine motors had been developed to allow powerboats to plane, it was found that the flat underside of a chined boat provided maximum hydrodynamic lift. Materials used today to make them are mostly materials such as aluminium, steel and plywood . The safety features used are poor as the hard chine hulls are light are can easily tip over in strong currents and waves.
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CatamaranA Catamaran is a watercraft made up of two connected hulls or a single hull with two parallel keels. The catamaran hull is used mostly on sailing vessels and ferries. The ride comfort is adequate as you are mostly leaning to aside to go a specific way. The safety features are okay, because they are light its easy to capsize, so its advised to have a even amount of weigh around the vessel. The cost effectiveness is good because they easy to make and don't cost a lot for repairs if it’s not damaged that bad. The material mostly used for this type of hull is plastic.
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