A shuttlecock generally has 16 feathers. Because when the number of feathers on the shuttlecock is the square of 2, perfect symmetry can be achieved, but because the weight of 8 feathers is too light, it is difficult for the ball to rotate, and the number of 30 feathers is too many and too dense, and 16 feathers are too dense. The balance is just right, the weight of the ball is moderate, and the ball is very stable in the process of flight. The length of each feather of a standard shuttlecock is between 64mm and 70mm, and each feather should be the same length from the top to the tip of the feather.
Badminton hardware requirements:
1. Stadium
The badminton court is a rectangular court with a length of 13.40m and a width of 6.10m (the width of the singles court is 5.18m), the diagonal length of the doubles court is 14.723m, and the diagonal length of the singles court is 14.366m. The width of each line of the court is 4cm, and the measurement should be counted from the outer edge of the line. The boundaries of the course should preferably be white, yellow or other easily identifiable colors.
2. Nets
The badminton net is 6.10m long and 76cm wide, made of dark high-quality natural or man-made fiber string. The mesh is square, and the side length is between 15-20mm. The upper edge of the net is sewn with a double-layer white cloth with a width of 75mm. The thin steel wire rope or nylon rope is passed through the interlayer of the white cloth, and then hangs firmly between the two net posts. . The height of the net in the center of the court is 1.524m, and the height of both ends of the net is 1.55m. The ends of the net must be fastened to the net posts and there should be no gaps between them.
3. Mesh column
From the ground of the court: the height of the net post is 1.55m. The post must be firmly perpendicular to the ground and keep the net in a tight state. The post should be placed on the midpoint of the doubles sideline.
4. Ball
The badminton should have 16 feathers fixed on the ball holder, the top of the feathers should be in a circle, the diameter is 58-68mm, the diameter of the ball holder is 25-28mm, the bottom is round, and the weight of the badminton is 4.6-5.5g. For non-feather balls, it is required to be made into a skirt, and the difference in quality and performance should not exceed 10%.
5. racket
The racket face should be flat, with strings crisscrossed through the frame or otherwise woven. The racket frame, including the handle, shall not exceed 680mm in total length and 230mm in width. The racket frame is generally oval, the length of the racket frame does not exceed 290mm, the length of the chord surface does not exceed 280mm, and the width does not exceed 220mm. There is no weight limit for the racket. The racket is not allowed to have appendages and protrusions, and it is not allowed to change the specified style of the racket.
