hue1402 2012-02-09 20:10:44

 Ships come in three categories : commercial, fishing and military. Ships date back to at least 60,000 years ago when humans spailed from Southeast Asia to the island of New Guinea. These first ships were very primitive. Not much changed in ship design for several millennia.

 A revolutionary tipe of ship design was developed in Egypt around 3,000 BC. These first vessels were made using planks of wood from papyrus trees and were connected to gether with leather straps and treenails. These 43-meter long ships called Khufu ships sailed down the Nile River and used oars for steering through the water.

 By 2,500 BC, the Indians advanced ship design these have work areas where a ship could be parked or docked while it was being built or needed repairs. This second phase of ship design helped speed up the production of shipbuilding. Large ship design continued during the Egyptian, Roman, Indian and Chinese Empires.

 The Han Dynasty added a crucial advanced ship design. During the 1st centry AD, a rudder is basically a flat sheet of wood, used for steering that is connected to a boat via a hinge. The stern-mounted rudder replaced the oar steering system.

 The late 18th century when ship builders began to experiment with iron and introduced cannons on their ships. Iron was used to reinforce a ship's internal frame. By the 19th century, iron replaced wood as the prefered material for constructing ships. If a ship had in it, water would only fill up the one bulkhead.