Understanding Shuttlecock Speed

Understanding Shuttlecock Speed

First, what is the speed? In badminton, "speed" refers to how far a shuttlecock can glide when hit with a certain power. "Further" is considered "faster". Associated with a difference in altitude of air resistance, moisture and certain temperatures, the same shuttlecock has different speeds in different places. Good shuttlecock used in Beijing can not be good when used in Jakarta. Good or shuttlecock used in Jakarta can not be good when used in Bandung. It is due to differences in temperature, humidity, altitude and air pressure in both places. 

Because of the difference in weight and other factors bergagai, shuttlecock has various speeds. The referee is responsible for shuttles every day and try to determine what speed to use at that time. Throughout this round of competition, we may request reimbursement shuttlecock speed as conditions such as heat and humidity, for example, has changed. This often led to disputes because of a slower shuttlecock can benefit a player while faster players will benefit others. 

IBF tournament, most of the Main Referee will try to 3 velocity (speed) of different shuttlecock to ensure that the speed is suitable for a particular situation at a particular time and place. 

So, speed or lambanan shuttlecock often does not indicate the quality of the shuttlecock. Naturally, consumer-entitled to vote. 

Table 3 below is a general system that is used today: 

International - metric wt. - Grain - speed 

1. 48-75 - slow, used in high areas (mountains) 

2. 49-76 - slow medium, used in warmer regions 

3. 50-77 - medium, used in coastal areas 

4. 51-78 - medium fast, cool area 

5. 52-79 - fast, cold area, below sea level (ie, the Netherlands) 

From the list, it can be seen that the shuttlecock traditionally divided into categories of 48, 49, 50, 51, ​​52. Categorization is based on the weight of the shuttle. Means weighing 48 4.8G, 50 means 5.0g, and so on. We found out that the shuttlecock that uses this category are often inaccurate and difficult to to be grouped. So, to use another way is by using the raw speed 

shuttlecock. Then is used speed (Speed) 75, 76, 77, 78, 79, 80 instead. That is, when struck with the same force 76 speed shuttlecocks will be 30 cm away from the shuttlecock speed over 75. So on for the other sizes. 

However, the speed of the shuttlecock will be different at various locations in the world .. That's why, in China, with the shuttlecock used in the Speed ​​76 Speed ​​77 summer and in the fall. Shuttlecock with speed 77. Shuttles with speed 75 match in Thailand; while the speed of 76 and 77 suitable for use in Indonesia, Singapore, Hong Kong and Malaysia; speed 77 and 78 in the United States; speed 78 and 79 match in Finland, Canada, Korea and Japan. While the speed of 79 and 80 in Australia in the fall. Speed ​​73 and 74 is only used in high areas such as Yunnan Province in China and Colorado Springs in the United States or in high temperature areas such as Johannesburg in South Africa. 

Shuttlecock also has a rotational speed that is essential for stability. For the stability of the shuttlecock at speeds in excess of Mach 0.65 (0.65 x speed of sound), the top curved bristles of the average position of 11.8 degrees to 20derajat or more of the body surface. 

When the shuttlecock glide, two power affects movement: Earth gravity pulling it down and the air resistance pushing it upward glide. Acceleration of gravity is constant (fixed). Acceleration of the air resistance increases when the shuttle glide through the air. When the formula is made like this: 

a = g - (f (v) 

a = acceleration 

g = gravity 

f (v) depends on temperature, humidity, altitude and air pressure.