hi, i just wanna ask: what exactly is for example U4? or 4U? is it the grip or the racquet? and what's the difference? thanks.
Racket Often times badminton players give the racket the most emphasis. If you go into badmintoncentral.com and you will find that most of the discussion centers on the racket. While the racket is certainly an important equipment, the importance of which is often overrated, and that is the reason why I put the Racket almost next to last in our recommendation list. The badminton racket is the middleman when transferring force from the player to the shuttle, sitting right between the grip and the string. A badminton racket can be categorized by a few characteristics: shape, stiffness, weight, balance. Virtually all badminton rackets are made of carbon fiber or graphite. Some manufacturers choose to put in extra ingredients into the racket material like titanium or recently nanocarbon. I want to emphasis that they are only addictives, the 99% of the racket is still graphite and the extra benefits of the additives are very marginal. Badminton rackets comes in two major head shapes: Isometric/square and Oval. Oval is the traditional racket shape, it is a slightly bottom heavy oval, almost the shape of an egg. Oval rackets in general have a small but more concentrated sweet spot. Oval fans like the concentration of power around the sweetspot of the racket. The shape is the Isometric or square which became more popular after the early 1990’s. The Isometric head has a wider and more squared top half of the racket head. The advantage of the isometric is an enlarged sweetspot which give off-centered hit a better response. The effective stiffness of a badminton racket is similar to the effective of string tension. So I will refer you back to that section. A stiffer racket has the similar effect as a higher tensioned string, while a flexible racket is similar to the lower tension string. Rackets comes in different weights. Normally the racket alone weighs between 80-95g. Different manufacturers have different rating system, the most popular of which is Yonex’s U system, U = 95-100g, 2U = 90-94g, 3U = 85-89g, 4U = 80-84g. a racket’s weight determines how fast one can swing a racket, the lighter a racket, the faster one can swing it with the same force. In general, a lighter racket is more maneuverable than a heavy one. However, before everybody goes out and buy the lightest racket, I also want to point out that lighter isn’t always better. A light racket is less stable than a heavier racket, more force is necessary to keep its path, furthermore, a heavier racket has a larger momentum and thus more effective in transferring its speed and power to the shuttle. The final racket characteristic is the balance of the racket. Head balanced racket is becoming more popular recently. Head balanced rackets have more mass near the head of the racket. A head balanced racket is more stable and have higher angular momentum when swung. On the contrary, a even balanced racket is more maneuverable. As you can see, none of the different properties of the above characteristics are strictly better than other. Some players prefers slightly heavier rackets, some prefer slightly lighter, some like even balanced, some like head balanced. What I want to point out is that ultimately, it is a person’s skill level and style that determines what racket is suitable, go try them out if you can to see what fits. ======================= taken from kwun's equipment article.... maybe a search would have found ur answer?
