In the ratio of the earth's sea and land, there are 71% of the ocean accounts for most of the land and 29% of the land. The ships and boats used to are no stranger to people's travel tools, and are known to human beings in six characteristics of ships.

Among them, the first, large size. Many of the container ships are transported back and forth through every day. For example, the average tonnage of container ships has developed from hundreds of boxes in the past to nearly 10,000 boxes at present.


Second, high-speed. Within the last 15 years, the average speed of more than 10,000 gross tons of ships increased by about 1kn, high-speed passenger ships, cargo ships, car-passenger ferries and container ships and other development updates, such as speed 50kn roll-on roll-off high-speed five-hull type ship, speed 38kn 1400 boxes of fast container ships, speed 40kn 1000 tons of high-speed wave-piercing cargo ships.


Third, the technical performance is constantly upgraded. Firstly, the economy is obviously improved, which is mainly reflected in the simultaneous reduction of fuel consumption and crew number of ships; secondly, the safety and environmental protection are greatly improved to avoid the recurring disasters of sea damage and reduce the pollution of ships to sea water and atmosphere.


Fourthly, the design methods keep progressing. Direct design calculation method, ship hydrodynamic performance forecast and optimization technology, new efficient low excitation propeller design technology are widely used, and information networking will be a major technical measure for ship design in the 21st century.


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