The function of sail: the angle can be adjusted according to the wind direction, so that the wind energy can be effectively used to push the ship forward. A kind of hide, canvas or other fabric that can be hung on the mast, and can be used to push the boat forward on the water when it is open. The types of sails are divided into bow sail, stern sail, top sail, oblique sail, square sail and jib sail according to different positions.

The first edge of the sail facing the wind is called the leading edge, which is located in the front of the ship. The trailing edge of the tail is called the trailing edge of the sail. The imaginary horizontal line from the leading edge to the trailing edge of the sail is called chord, the curvature of the sail is called draught, and the vertical distance from the chord to the maximum draught point is called chord depth. The side of the sail that is filled with air and forms a concave curvature is called the windward side, and the side that is blown outward and forms a convex side is called the leeward side.

Type of extended data sail

1, modern sloop. Single-masted sails are the most common among small and medium-sized sailboats. The ship has a mast and two sails. The main sail is a tall triangular sail with the leading edge mounted on the mast and the tail mounted on the cantilever extending backward from the mast.

The spinnaker is called "Bermuda sail", sometimes called "Marconi sail", because it was developed on ships in Bermuda two centuries ago, so it got its name. According to the physical principle that the wind blows over the sails to generate power, when the ship sails in the wind, the tall and thin sails usually generate more power. Most sailboats now use Bermuda sails.

3. Double mast sail. The main advantage of a dhow sail is that each sail is smaller than the corresponding sail on a dhow of the same size, which makes sailing easier. Small sails are lighter, easier to raise and flatten, and smaller to store and store. Having three sails also provides more possibilities and flexibility for controlling the combination of sails.

Source: Baidu Encyclopedia-Sailing