China had a shipyard in the Spring and Autumn Period and the Warring States Period, which was able to manufacture warships. In the Han dynasty, ships with rudders could be made; During the Three Kingdoms period, the biggest warship built by Wu was a "five-story building"; The warship Lian Fang was built in the early Western Jin Dynasty and can carry more than 2,000 people. Paddle wheels and watertight doors were invented in the Tang and Song Dynasties, and people traveled overseas by boat. The treasure ship of Zheng He's seven voyages to the West in the Ming Dynasty was about 137 meters long and 56 meters wide, with nine masts and 12 sails.
From 700 BC to 550 BC, Phoenicia and Greece successively built a double-deck paddle warship and a triple-deck paddle warship, with a displacement of about 200 tons and a maximum of 170 paddle. When rowing, the speed can reach 6 nautical miles per hour. Since then, the three-layer paddle warship has become the main force of the ancient Roman naval fleet.
/kloc-in the third century, the Spanish and Portuguese began to build multi-masted sailboats, usually with three masts, the front mast and the main mast hung with transverse sails, and the rear mast hung with triangular longitudinal sails, with displacement ranging from tens of tons to hundreds of tons; There are also some ships with a small sail and a top sail extending forward from the bow above the main sail and the front sail, which can make full use of the wind, be fast, flexible and easy to operate, and are widely used for sailing in the open sea. Columbus discovered the new continent, da? Gamma crossed the Indian Ocean to reach Asia, and Magellan completed the first round-the-world voyage. They all use this sailboat.
/kloc-In the middle of the 6th century, Spain organized a huge fleet, which traveled between the Atlantic Ocean twice a year. In order to protect the transport fleet from pirates and ships from other countries, the Spanish began to build large multi-masted warships. From 65438 to 0650, the Atlantic Ocean entered an era of frequent naval battles, which promoted the development of warships in European colonial countries such as Spain, Portugal, the Netherlands, France and Britain, and the ships became larger and larger. At first, the largest warship displacement was about 1.500 tons. By the19th century, the largest long-distance warship had a displacement of nearly 6,000 tons, and was equipped with more than 1,000 guns of large and medium caliber 1000. At that time, windsurfing warships with a displacement of more than 1000 tons were called "battleships", and those with a displacement of 500 ~ 750 tons were called "cruisers". The hulls of these warships are usually made of solid oak boards, which are double-layered with a total thickness of 46 cm; ; Later, the same technology was used to build large ocean-going merchant ships.