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How did the Chinese develop watertight bulkheads?
They are built by applying the key technologies of rabbet-jointing planks together and caulking the seams between the planks with ramie, lime and tung oil. …
What are the different purpose of the bulkheads?
Bulkheads in a ship serve several purposes: increase the structural rigidity of the vessel, divide functional areas into rooms and. create watertight compartments that can contain water in the case of a hull breach or other leak.
Why are they called Chinese junks?
The origin of the word “junk” in the English language can be traced to the Portuguese word junco, which is rendered from the Arabic word j-n-k (جنك). The word was used to denote both the Javanese/Malay ship (jong or djong) and the Chinese ship (chuán), even though the two were markedly different vessels.
Who invented bulkheads?
It is believed that Lu Xun, the leader of the peasant rebel army at the time, was the inventor of watertight bulkheads. 1 They quickly gained popularity and were widely used throughout the Tang Dynasty.
How were Chinese junks made?
The junks are made mainly of camphor, pine and fir timber, and assembled through use of traditional carpenters’ tools. They are built by applying the key technologies of rabbet-jointing planks together and caulking the seams between the planks with ramie, lime and tung oil.
What were junks used for?
Wooden sailing ships, called junks, were used by merchants to carry goods along rivers and canals or by sea. They were also used by pirates, who stole from the merchant ships. Junks were the first ships to have rudders, which allowed them to be steered easily.
What is the purpose of watertight bulkhead?
Watertight bulkheads are vertically designed watertight divisions/walls within the ship’s structure to avoid ingress of water in the compartment if the adjacent compartment is flooded due to damage in ship’s hull.
Are bulkheads necessary?
Don’t worry– it happens to the best of us. But Bulkheads can prevent this by keeping waterfronts elevated and clear of rocks and hazardous areas. If you have a boat or are interested in having visitors come to your property via watercraft, a bulkhead is practically a necessity.
How long were Chinese junks?
These massive, well-built ships were said to be 400 feet long and 160 feet wide (that’s 40 stories from bow to stern and 16 stories from starboard to port)! One of the unique features of the junks were the shape of their sails, which were very different from those of Western ships.
How were Chinese junks used?
What is a watertight bulkhead?
How did the Chinese junk work?
junk, classic Chinese sailing vessel of ancient unknown origin, still in wide use. High-sterned, with projecting bow, the junk carries up to five masts on which are set square sails consisting of panels of linen or matting flattened by bamboo strips. Each sail can be spread or closed at a pull, like a venetian blind.