Beginners buy tennis rackets
Carbon fiber is a fibrous carbon material, using some organic fibers (such as nylon, acrylic, rayon, etc. ) as raw material, organic fiber is combined with plastic resin, placed in rare gas and carbonized at 2000-3000 degrees high temperature and pressure. Generally used in aviation, military and so on.
Carbon materials are usually materials containing carbon elements in powder form, such as graphite.
Tennis racket material carbon aluminum material and carbon titanium material are cheaper.
Tennis racket material glass fiber 400- 1200 RMB.
Tennis racket material carbon/glass fiber (carbon material/glass fiber) is generally 700- 1300 RMB.
Tennis racket is made of carbon fiber (carbon fiber) 1700-3000 RMB.
Carbon fiber is a kind of high strength fiber, as soft as rope. It should be combined with the resin matrix and cured. The proportion of resin is generally between 38% and 57%. The higher the resin content, the worse the performance of the tennis racket and the cheaper the price. There are tennis rackets with resin content below 34%, which are special rackets for professional competitions and are very expensive. Commonly used resins are: polyester, epoxy resin, thermoplastic resin, etc. Among them, epoxy resin-based carbon fiber tennis racket has the best performance, several times higher than other resins, and the racket has the highest price. The racket used in professional competition adopts epoxy resin-based carbon fiber prepreg, with 34% epoxy resin and 66% carbon fiber. I don't have a tennis racket made of 100% carbon fiber because it can't be molded at all. This is a lie of the merchants. In foreign countries, they dare not label materials like this. Why do they just cheat us China people?
Carbon fiber prepreg 125g/m2, excluding tax 137.3 yuan /m2, and then multiplied by tax 17%, the blank weight of one beat is 330-350g；; In addition, the corner loss is reduced by about 430 grams. Plus labor, grinding, painting (85- 1 10 yuan/piece), auxiliary materials (70- 120 yuan/piece), packaging (85- 160 yuan/piece), defective rate and production equipment. Plus the profits of sellers and retailers, plus 5% business tax, plus 20% income tax and so on. The cost of materials is only a fraction of the selling price. Take our commonly used nail clippers as an example. Its material cost is less than 0.23 yuan. The retail price of 3 yuan nail clippers is relatively poor. The average retail price of nail clippers commonly used in our family is around 8- 10 yuan. However, the production process and technology of nail clippers are much simpler than those of carbon fiber tennis rackets. Let's look at the gap between the material cost and the sales price of daily necessities, cosmetics and large and medium-sized consumer goods. If 300-500 yuan can buy 100% carbon fiber tennis racket, then 50,000 yuan can easily buy a BMW. It's so fake! ! ! !
The surface of the tennis racket is coated with a beautiful paint, and it is impossible to see what material is under the paint.
When buying high-priced tennis rackets, it is best for merchants or manufacturers to make a written commitment to the ingredients of tennis rackets, such as fake replacement, valid for at least 3 years. In this way, when you want to replace the racket or the racket is damaged, you can see it clearly by sawing it. Glass fiber, carbon fiber, carbon, carbon aluminum, carbon titanium and other materials can be distinguished. There are more and more people who know about carbon fiber in China. Take the sawed part and ask for advice. It's fake. You can sue him for fraud and demand compensation. At present, there are many materials in the domestic market.
Many brands of tennis rackets are made in China. The materials used to make tennis rackets determine the performance, quality and feel of tennis rackets. It is better to value the brand than the material (if you know the material) and the written commitment.
The logo on the tennis racket:
W is Wilson.
He is Hyde.
Y is Younix.
D is Dunlop.
All kinds of equipment used by professional tennis players can be provided by well-known sporting goods sponsors, one is to improve brand awareness, and the other is to ensure the continuous competitive state of professional athletes. In addition, the rackets in the hands of professional tennis players are different from those available to the public. This is another embodiment of the brand strategy of tennis equipment.
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AMSSEFCSL's criteria for choosing tennis rackets
"AMSSEFSCL" standard is very popular in the world. The following are the nine elements of the AMSSEFSCL standard:
A-constant weight (weight)
A racket that is too heavy will make the player move slowly when swinging, and a racket that is too light is not easy to cope with a strong incoming ball and is easy to retake.
Normal selection: Generally speaking, the application range of young men is 320—330g, middle-aged and elderly women are suitable for rackets between 300—320g, and the application range of young women is 280—300g.
M measurement (handle size)
Just like weight, the size of the grip should make you feel comfortable.
Normal selection: 4 3/8 is suitable for ordinary male players, and 4 1/2 can be used if the ability allows; Female, 4 1/4—4 3/8.
S skin (holding skin)
The outer skin on the grip is the part of the racket that contacts the human body. When the skin is bad, you can't grasp the racket well. In this case, even if you have the best racket and the best skills, you can't play.
Normal selection: the skin of the grip needs attention and frequent replacement, which is a good way to keep the skin of the grip in the best condition.
S- dessert (sweet area of noodles)
Hit the ball away from the center of the racket, which is called sweet spot in English (translated as "dessert" or "sweet area" in Chinese). Normal choice: a large racket is easy to learn and can hit the ball slightly off the center. The disadvantage is that the speed is not enough and the control is not good. Suitable for women, beginners and the elderly, and it is appropriate to use11115 square inch. Small racket face is suitable for middle and senior players and young players. It is characterized by fast ball speed and good point control, but small sweet area.
Electron balance (equilibrium point)
The balance point is related to the weight of the racket face, and its central topic is "heavy head" or "light head", which is also a topic suitable for everyone.
Normal selection: the head weight is suitable for long-range shooting, and the bottom line draws the ball; Logger Vick is suitable for tennis volley, which is commonly used by two-handed players.
F-shape
The shape of each racket face has its own unique design concept, and the location of the sweet area is different with different shapes. Generally speaking, the shape of the racket face is mainly oval and oval, the sweet area of the oval racket face is in the center of the racket face, and the sweet area of the oval racket face is in the center behind the racket face, which is close to shaking hands. Those who are good at steady shooting can choose the former, and vice versa.
Normal selection: This can be seen from the introduction of the beat or label.
C structure (structure)
From the structure of tennis racket, the whole racket will have different hardness. Of course, people with big swing and strong power are suitable for people with low hardness (if people with big swing and strong power use a racket with high hardness, the handle, racket mesh and racket frame of the racket are easy to be damaged).
Normal selection: it will also be displayed in the label, and most of them are represented by numbers. The larger the number, the smaller the hardness.
S-the number of pounds of the racket.
The higher the number of pounds of the racket, the lower the elasticity, but the player with fast swing speed can get better ball control effect. A low number of pounds will produce a spring bed effect, increase the rebound force and reduce the relative possession of the ball.
Normal choice: The most commonly used weight of tennis rackets is between 55 and 60 pounds, and professional players often wear them ("wearing" means that professional players require manufacturers to wear thicker net wires when producing rackets-because the net wires are thicker, the weight is larger) to about 70 pounds.
L- linearity (line selection)
The mainstream of tennis thread is nylon thread, which can be produced in large quantities because it is not afraid of moisture and wear-resistant, and its price is reasonable and popular. However, nylon thread also has shortcomings because it is easy to relax and the number of pounds changes.
Normal choice: there are too few durable and easy-to-hit lines, because the thicker the line, the more durable it is, and the thinner the line, the better it is. Therefore, people who will be disconnected in three or two days had better wear thick thread with a diameter of 1.35mm to 1.45mm, but the thick thread doesn't feel very good. The thin thread is generally between 1.20mm and 1.30mm, with keen ball cutting and good elasticity.
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Some parameters of tennis racket
Head size:
The racket face MID 95 square inches, MP 96- 100, and the OS racket face is on it. That is, China, China, Canada and Super Large.
Generally speaking, novices and weak women suggest using OS to hit the face. The hitting area is large and the dessert is large, which makes it easy to catch the ball. Moreover, due to the large hitting area, the power of the ball is dispersed after hitting the net, the force unloading effect is obvious, and the use force is convenient. Because of the small dessert, the racket face requires high skill and strength when hitting the ball, but more concentrated strength when hitting the ball can facilitate powerful players to make a fierce blow! Therefore, most of the rackets on the middle racket face are heavy rackets, which are specially equipped for violent players. And MP racket, can be said to be the most mainstream racket today, can be used from experts to newcomers, and can be selected according to their own characteristics.
Length: The standard racket length is 27 inches /69 cm.
Among adult rackets, there are no short ones, only long ones, in order to lengthen the arm, but the increase of strength demand can bring more strength to serve and hit the ball. Please refer to the knowledge of basic mechanics in middle school for this question. Zhang Depei was the first person to try a long shot, so he increased the service speed to120mph. The most famous lengthening rackets are POG lengthening, that is, Zhang Depei generation, and PD+ endorsed by Roddick. However, it is not recommended for beginners to use PD+, because it is very easy to get tennis elbow due to uncoordinated movements. However, Zhang Yilong can recommend it. It is extremely friendly to the arm, but it is a bit heavy and does what you can.
String weight:
How powerful it is, you will know if you can play it if you shoot more. Except O3, the weight of other beats can be used as the parameter of swing weight.
Give a reminder to men who want to play violent ball: the master has strong coordination ability, and he can play violent ball with a light pat, but the average person is not strong enough. If you want to play violent ball, it is better to use momentum theorem, that is, if the racket hits the ball hard, the opponent will work harder. That's why people like Roddick who don't paint have to add a lot of lead to the beat.
Balance:
Save effort before putting the net, and the bottom line is laborious. It's hard to touch the net again, but the bottom line is to save effort. However, if you want to exert your strength and strengthen control, your head is light. For technical players or women who don't want to hit their arms hard, it's good to take a head shot again. If you want to learn from professional players, relax. Control and self-development are ways to improve skills!
There is a counterexample. Sister W, big and small, is super strong, retakes her head and often makes extremely nonstandard movements to hit the ball, but because they have muscles that are not lost to men, ......
Data explanation: 1pts has a light head, that is, the balance point of the racket is near the handle 1 point;
Formula: 1pts = 1/8 inches =1/8 * 25.4mm = 3.175mm = 0.3175cm.
For a racket with a nominal length of 27 inches or 68.5cm, the balance point is 31(68.5/2-0.3175 = 33.9) cm away from the handle. The balance point value of the head weight plus the midpoint.
NSIX-ONE 90,9 nods gently, that is, 68.5/2-0.3175 * 9 = 31.4, that is, the balance point is 3 1.4CM away from the handle number. The number on the website is 3 15, which is different because the rounding point I took is more accurate.
1 nodding weight, that is, 68.5/2+0.3 175=34.5CM, that is, the number of grips from 34.5CM. ..
Most rackets will be lighter than the original weight, which we can understand as saving some weight through inertia. O3 is an exception. The oversized hole reduces the negative force and makes the racket swing much lighter than its own weight. I wonder if there will be a situation where the self-weight is 350 grams and the swing coefficient is less than 300. This index suggests that you try it yourself before you feel it. Because the swing weight is greatly influenced by factors such as hitting mode and position.
Stiffness (hardness):
The harder the racket, the more elastic it is for the ball and the arm, so the soft racket is very friendly to the arm. However, if used well, it is also terrible to use the power of hard hitting after the Force. Think of PD+' s American gun 250+KMH suit. Soft rackets have large deformation and strong absorption, and need more self-exertion. If you like to borrow money with little effort, you'd better choose a racket with hardness above 65. On the contrary, powerful people can better exert their control and strength with soft beats.
Beam width: 22-25mm
The factor that directly affects the strength index of the racket is that the thicker the racket frame, the smaller the deformation of the racket tube, the stronger the racket strength and the better the shock absorption. The thinner the racket frame, the better the control of the racket and the more flexible the racket. The thickness of the racket frame is also related to the size of the racket face, and the OS racket face is rarely less than 20 mm In short, the narrow-sided racket is a violent racket, and both L6 and Tour90 belong to this category. Wide-sided ones such as PD have good borrowing effect.
Composition: graphite/Kevlar fiber (Cabra)
At present, carbon is the main material in the racket, and metal or fiber substances are added to increase the hardness of the racket and strengthen its strength and stability. Just to explain, some people are not used to the vibration of metal elements, and can choose a pure carbon fly swatter with good shock absorption effect. This varies from person to person.
By the way, explain the problem of shock absorption here. If you feel vibration, add shock absorption. If it's too dull, don't add shock absorption. If you still feel that the wood has no shock absorption, change to a strong vibration line or a strong vibration beat. People with a keen sense of touch, such as Federer Safin, don't need a shock absorber, but they will use it like old San Agassi. Strong players such as Nadal and Clijsters also use shock absorbers. So let's judge for ourselves. Moreover, shock absorption also has different styles and effects, and the more wires are wound, the better the shock absorption effect is.
By the way, a batter who uses more than 95 rackets, if he uses a hard line other than Lux wave, will often be knocked off by using the general shock absorber (it is too late to arrange the line when hitting the ball continuously, and the shock absorber will fall off due to excessive force and loose line). It is recommended to use rubber bands, rubber tubes and other shock absorbers that can be tied to the line.
Power level:
The greater the strength, the smaller the strength, and the smaller the strength, the more you need to exert yourself. Let's do our best.
Generally speaking, this is an index closely related to racket weight and swing weight. A remake requires a fast swing speed. Why? Because the swing is not hard enough, the speed is not fast enough, and you can't play a good ball without strength. So the weight and swing weight determine your swing speed.
The swing weight is small, the swing speed is moderate, the strength is small, and there are many levers, which is suitable for leisure playing.
Grip type (original grip model): Syntec grip.
What's the use? If you like the angular feeling of the handle or want to increase the thickness of the handle, you can change it into calf leather, but the price is very expensive, so novices don't have to. Some of them are easy to shoot, such as N90 in calf and shin. Other inner handles are also thickened for shock absorption or quick drying and sweating. In principle, it is possible to replace the outer handle. Generally, it is not necessary to replace the skin of the inner handle.
Handle size
Watch your hands. One finger is the best. Look at the picture!
Note: the master who pursues topspin will choose a smaller handle to facilitate wrist rotation, but novices or unskilled people should not pursue wrist stroke too early!
String type: 16 main line (vertical line)/19 cross (horizontal line).
Remember, the fewer vertical lines, the better the topspin effect, and vice versa. 16* 19 is the mainstream today, but 18*20 still occupies a part of the market. For example, Hyde's prestige and Deng Lupu's 200G still occupy a special market. Safin used his natural quality to play a very strong topspin with a racket with a small racket bed. It can be seen that the technical advantage is far above the beat!
By the way, the line is sparse, the racket face is shot in MP or OS, which is easy to run, and the small racket face has relatively few tight line beds. If you especially don't like the whole thread, go to polyester thread. If you are a master who often knocks away the hard line of Lux waves, it is recommended to change to a racket with a small face.
String tension: 53-63 lbs.
Non-Luxbo hard line should be adjusted according to the recommended median value of the beat and then according to the feel. Increase the strength, reduce the number of pounds, want to control, increase the number of pounds, and adjust 2-3 pounds at a time.
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How to choose a tennis racket
First of all, you have to decide whether the racket you choose is what you think the guests need or what the guests require. It sounds like I am looking forward to finding a selling point, but it is really important! A balanced racket can make players play their best in the game.
Many brands divide their rackets into three types to suit three different players. For example, a racket with hard body and high elasticity is suitable for players with small swing and slow speed. The racket with soft body and less elasticity is suitable for players with full frame and fast swing speed, and the performance is between the two for players with medium amplitude and speed.
So, should we consider the racket itself or the characteristics of the swing first? This is very important, especially for beginners. If you give him a flexible racket, he will have to shorten his movements to keep control of the ball; If you give him a racket with a soft body and little elasticity, he will have to lengthen his movements and increase his swing speed to keep the depth of hitting the ball. So, before choosing a racket; You must determine what kind of player your guests expect to be and how willing they are to adjust their movements immediately.
First, treat customers who buy rackets for the first time.
It is difficult for a guest who has just started playing tennis to decide what kind of racket to choose. It takes a long time, and it may not be 100% accurate, because such guests often don't know what kind of player they want to be. For such a player, I suggest considering his height, body shape and physical fitness. If he is a tall and strong player with good physical fitness, I suggest using a racket with soft body and little elasticity, because they can complete a swing with large amplitude and fast speed. If you are a player with small body and poor physical fitness, it is suitable to use a hard and elastic racket, so that you can get enough strength and depth without greatly moving them to hit the ball; Finally, if you are not sure what type he belongs to, you can ask them to try a medium-sized racket. After they really get in touch with tennis, they will gradually find out what they need from the racket, because then they will have some reference opinions. When you choose a racket for a guest who is new to tennis, you must let him know that this racket will not be suitable for him forever.
Second, treat guests who can provide reference opinions.
Once players have the experience of using rackets, it is much easier to choose the right rackets for them. If they know different technical data, they can find a racket that suits the kind of player he wants to be. When choosing, you should look at the manufacturing data on the racket, understand the influence of these data on the racket, and what kind of players are suitable for it. When we talk about each set of data, we are all discussing its influence on the elasticity, handling performance, rotation and feel comfort of the racket, and of course there are other important factors, but these are the key points we should consider.
Third, the technical data of the racket
1, length
The distance from the top of the racket head to the bottom of the grip is the length of the racket. The standard length is 27 inches, although most rackets are close to 275 inches now. Without slowing down the swing speed, the lengthened racket will hit the ball more forcefully, because it provides longer torque, which means the racket head is faster; At the same time, the lengthened racket allows players to catch those balls that are slightly farther away, which means that your court coverage has increased, but the foot movements have decreased relatively; Moreover, the lengthened racket can create more rotation when the player spins the ball, because the speed of the racket head increases at the moment of contact with the ball.
Wow, more spins. More power and longer balls. Sounds attractive, doesn't it? So why don't you lengthen your rackets? It turns out that there are still some unfavorable factors hidden in it. First of all; If you can't control the ball in the court, power is unnecessary for you. Secondly, if you use an extended racket, it will be more difficult to maintain the original swing speed, because the weight of the racket away from the hand is greater (that is, the swing weight increases). If you slow down the swing speed, the speed of the racket head will also slow down, and there is no way to talk about strength. In addition, the lengthened racket is also inferior in handling, which means that it is difficult for you to hit the ball in time, which is especially easy for players to find when intercepting in front of the net. Finally, you will feel a little uncomfortable when you hit some close balls with an extended racket. When we choose for our guests, all these facts should be taken into account to decide whether their next racket should be shorter or longer or as long as his original one.
2, the size of the racket face
At present, the racket face size ranges from 85 square inches to 135 square inches. The bigger the racket face, the bigger the dessert (the most effective area for returning the ball), which means that more mistakes can be allowed when hitting the ball and a stable ball can be played in a larger area. If the density of lines is not increased, the gap between lines will increase, so a racket with a larger racket face is easier to break than a racket with a small cypress face. Because the gap between the city and the line is relatively large, the contact between the ball and the line is relatively full when hitting the ball, which also helps to create rotation. For many players, it is more comfortable to use a racket with a larger racket face (unless he deliberately increases the number of pounds of threading), because the racket face is larger, the distance between the net line and the racket frame is larger, and the line has more opportunities to extend when touching the ball. In addition, a racket with a large racket face will have a small twist and swing when your hitting point deviates slightly from the sweet zone, because even if the hitting point deviates slightly from the sweet zone, it is still far from the racket frame compared with a racket with a small racket face.
However, a racket with a larger racket face is generally considered to be inflexible, and many athletes tend to choose a racket with a smaller racket face to handle the ball flexibly. The area of the racket face will directly affect the strength of the racket, because the larger the racket face, the longer the net line, the greater the extension and the greater the strength (the ball hits deeper). In addition, the area of the racket face will also affect the position of the sweet zone, and the sweet zone of a racket with a smaller racket face is usually higher than that of a racket with a larger racket face. Research shows that most players tend to hit the ball above the center of the linebed. We can observe where these players often hit the ball, if you push the horizontal line away from the original position into a straight line; You will find that the groove is deepest where they hit the ball the most. You can also draw a pattern on the racket to see which area fades fastest.
3. Bending/Hardness
The hardness of the racket directly affects its elasticity; When hitting the ball, the racket will bend backward, and the greater the extent of the racket's backward bending, the less the momentum it has just returned to the ball; Because before the racket bounces, the ball has left the spool. Therefore, a harder racket can provide greater elasticity, while a softer racket has less elasticity. To achieve the same effect as a harder racket, the player's movements should be bigger and more complete.
For the same reason, a harder racket is more likely to transmit the vibration generated when hitting the ball to your arm. When people talk that the control ability of a softer racket is better than that of a harder racket, it actually depends on how you define the control ability. Indeed, the softer racket can't send the ball as far as the harder racket (this is one of the definitions of control ability), while the harder racket has stronger control over the hitting direction, because the hitting point slightly deviates from the sweet zone, resulting in less torsion and swing, so it can send the ball in the direction you want more effectively. On the contrary, a softer racket twists and swings more when it touches the ball, so the ball will not leave at the angle it entered when it comes out.
The hard racket will have a little influence on the manufacturing rotation, but it does not have the net wire, the number of pounds of threading and the density of the wire bed. Although a hard racket has little or no influence on the grip performance, you need to consider the grip when choosing rackets with different hardness. If you want to choose a soft racket, you must first find out whether the racket is flexible, because players must speed up their swing to get the same hitting power.
Hope to adopt