QUOTE : Aluminum Hulls<br /><br />In 1931 England, aluminum was used in the construction of the Diana II, a 55 foot express cruiser, which is still in use. Aluminum is non-magnetic and is almost never found in the elemental state. As a ductile metal it is malleable and has about one-third the density and stiffness of steel. Aluminum is a corrosion resistant, easily machined, cast, drawn and extruded, however the procedure to weld it is more difficult and different from other metals. In 1935 the Bath Iron Works in Maine, built an experimental hull for Alcoa. Named the Alumette, it was floated to the James River in Newport News, Virginia for the purpose of testing its structural properties.<br /><br />The MV Sacal Borincano was an all-aluminum constructed Roll on Roll off, or Ro-Ro ship, designed to carry 40 highway trailers between Miami, FL and San Juan. PR. The relatively small ship was 226 feet in length and has a displacement of 2000 tons. The South Atlantic and Caribbean Line Inc. operated the vessel which was constructed by American Marine in 1967, with help from the Reynolds Metal Company. The vessel was constructed completely of heli-arced aluminum plates to achieve a working speed of 14 knots with a diesel electric power plant of 3000 hp generating 2240kW.