rhaluminiumboats-blog

[rhaluminiumboats-blog]

RH BOATS Photos

[rhaluminiumboats-blog]

RH Aluminum Boats: Boat History

Dugouts are the oldest type of boats found by archaeologists, and boats have served as transportation since the earliest times. Circumstantial evidence, such as the early settlement of Australia over 40,000 years ago, findings in Crete dated 130,000 years ago, and findings in Flores dated to 900,000 years ago, suggest that boats have been used since prehistoric times. The earliest boats are thought to have been logboats, and the oldest boats found by archaeological excavation date from around 7,000–10,000 years ago. The oldest recovered boat in the world is the Pesse canoe, a dugout made from the hollowed tree trunk of a Pinus sylvestris and constructed somewhere between 8200 and 7600 BC. This canoe is exhibited in the Drents Museum in Assen, Netherlands. Other very old dugout boats have also been recovered. Rafts have operated for at least 8,000 years. A 7,000-year-old seagoing reed boat has been found in Kuwait. Boats were used between 4000 and 3000 BC in Sumer, ancient Egypt and in the Indian Ocean. Boats played an important role in the commerce between the Indus Valley Civilization and Mesopotamia. Evidence of varying models of boats has also been discovered at various Indus Valley archaeological sites. Uru craft originate in Beypore, a village in south Calicut, Kerala, in southwestern India. This type of mammoth wooden ship was constructed[when?] using teak, without any iron, and had a transport capacity of 400 tonnes. The ancient Arabs and Greeks used such boats as trading vessels. The historians Herodotus, Pliny the Elder and Strabo record the use of boats for commerce, travel, and military purposes. RH Boats -  Buoyancy A floating boat displaces its weight in water. The material of the boat hull may be denser than water, but if this is the case then it forms only the outer layer. If the boat floats, the mass of the boat (plus contents) as a whole divided by the volume below the waterline is equal to the density of water (1 kg/l). If weight is added to the boat, the volume below the waterline will increase to keep the weight balance equal, and so the boat sinks a little to compensate Motorsailers Some motorboats are also sailboats. A whole new set of factors applies when you add a sail. Sailboats with motors can both sail and motor in all conditions. It is a very adaptable vessel. With a motorsailer, there are trade-offs. Motorsailers, like many hybrids, tend to be inefficient in special conditions where either a sail only or motor only boat would be ideal. The deck and superstructure provide a place to man the sails, walk around up top and also determine the amount of living space beneath. Building materials for boats Until the mid-19th century most boats were made of natural materials, primarily wood, although reed, bark and animal skins were also used. Early boats include the bound-reed style of boat seen in Ancient Egypt, the birch bark canoe, the animal hide-covered kayak and coracle and the dugout canoe made from a single log. Bill Streever describes a boat made by the native Inupiat people in Barrow, Alaska as "a skin boat, an umiaq, built from the stitched hides of bearded seals and used to hunt bowhead whales in the open-water leads during spring...". By the mid-19th century, many boats had been built with iron or steel frames but still planked in wood. In 1855 ferro-cement boat construction was patented by the French, who coined the name "ferciment". This is a system by which a steel or iron wire framework is built in the shape of a boat's hull and covered (trowelled) over with cement. Reinforced with bulkheads and other internal structure, it is strong but heavy, easily repaired, and, if sealed properly, will not leak or corrode. These materials and methods were copied all over the world and have faded in and out of popularity to the present time. As the forests of Britain and Europe continued to be over-harvested to supply the keels of larger wooden boats, and the Bessemer process (patented in 1855) cheapened the cost of steel, steel ships and boats began to be more common. By the 1930s boats built entirely of steel from frames to plating were seen replacing wooden boats in many industrial uses, also for fishing fleets. Private recreational boats of steel are however uncommon. In 1895 WH Mullins produced steel boats of galvanized iron and by 1930 became the world's largest producer of pleasure boats. Mullins also offered boats in aluminum from 1895 through 1899 and once again in the 1920s In the mid-20th century aluminium gained popularity. Though much more expensive than steel, there are now aluminum alloys available that do not corrode in salt water, and an aluminium boat built to similar load carrying standards is lighter in weight than the steel equivalent . Around the mid-1960s, boats made of glass-reinforced plastic, more commonly known as fibreglass, became popular, especially for recreational boats. The United States Coast Guard refers to such boats as 'FRP' (for fibre-reinforced plastic) boats.