Power or Sweet Zone: This is the area in square inches (above 19 inches) where power potential is greater than or equal to 30% ... ... TWU delineates 3 sweet zones: 20%, 30% and 40%, but for comparison purposes we report the 30% area. 4. This is calculated separately for each impact location. A larger power zone is associated with a more stable and comfortable shot on off-center impacts. Velocity decreases due to recoil and both lengthwise and widthwise rotation. 3. 3 and 9 o'clock), the more difficult it is for the ball to twist the racquet on off-center hits, thus providing more stability, power, comfort and control. Rackets by Type. Location of mass is more important to swingweight and twistweight than is the amount of mass. The relative velocities are shown as the lengths of the respective arrows (though not shown to scale and meant only for illustration purposes). ∨ 8. The shot results from this analysis will thus be the results of both a change in racquets and player behavior. Which shoes used by the cricketer Virat Kohli, so all questions covered here. 5. The scatter in the power dots at each swingweight (x axis) is due to each racquet's twistweight and stiffness (vibration). Since shot speed depends on both swing speed and racquet power, the result will depend on whether the increase/decrease effect of one out weighs the decrease/increase effect of the other. But power increases with added swingweight and decreases with lower swingweight. Adding weight anywhere on the racquet will increase the weight and swingweight (as measured from the end of the racquet). This varies at each impact location and it is the "effective" mass at that point. Why isn't control included as one of the performance measurements? You won’t even be able to perform well if the shuttlecock is not right. The net effect is to decrease distance on same effort hits and slightly increase it for same swing speed hits. The customizations offered here are just examples of how customization affects performance. ステムでサポートさせていただきます。サーバーには信頼性の高い、IBM i を使用しており、大会の規模に応じて以下の集計方法を選択することができます。 The shot parameters used are of a average topspin shot and are descibed below. 5. It is the one spec that will give some hint at what the overall performance characteristics of the racquet will be. Why are the TWU specs often different than the TW specs? A high power potential means that impact causes less recoil, twist and bend, thus resulting in more power, control, and comfort. Static specs are length, headsize, weight, balance, swingweight, flex, and twistweight. 1. Then compare those specs to the appropriate colored racquet in column one or two. Sale Head Graphene 360+ Speed Pro Racket. The racquet's contribution to ball speed is known as "bounce speed" and can be caluculated as the ball speed minus the racquet speed at the impact point. Swingweight and twistweight increase linearly with mass and with the square of distance from the butt and center line. It too is a measurement that indicates distribution of mass, but it is far less reliable for predicting performance than swingwight, twistweight, hittingweight and power potential — because you can have a high balance and low swingweight or low balance and high swingweight. 2. The result also depends on whether the impact is on-center or off-center. As calculated here, plow-through is the percentage of initial velocity remaining immediately after impact at the precise impact location. 3. The size of the sweet zone area is the result of all racquet properties as they combine to launch the ball from each location. Swingweight affects swing speed, but how much and in what direction depends on the player. These are not directly factored into this analysis. Performance is the result of the combination of all the specs. 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Why are the similar racquets sometimes located far away from the reference racquet in some of the graphs? 2. To find out how and why, click the question mark next to the dropdown choices for an explanation.]. All these are fixed in the tool except swing speed. 4. For on-center hits, twistweight is not a factor and shot speed is influenced only by swingweight and its affect on swing speed and power potential (ACOR) (hence less scatter in the graph). Thus, the same effort swings applied to varying swingweights will produce varying swing speeds. 1. Control will thus be a future add-on to the tool. Swing speed is the racquet speed at the point of impact. ファミリーマートのサステナビリティマネジメントについて掲載しています。 Higher hittingweight means more power, stability, and comfort. There is no such thing as "THE" spec for any racquet parameter. Two choices are offered to demonstrate the influence of all the key racquet variables in shot performance. The vibration frequency is the same at all points along a racquet. 尼崎市立中学校部活動の方針 amagasakisibukatudou(2021).pdf . Swing with same effort. Mass is the effective mass, or hittingweight. On-center hits are less frequent and one spec alone stands out as influencing performance — swingweight. Low frequency indicates lower stiffness, more bending, more energy loss and less shock. 焼津市立豊田小学校 〒425-0077 静岡県焼津市五ケ堀之内2番地 tel：054-628-3201 ／ fax：054-626-1951 These may all differ. ∨ 6. The graphs are meant to give an immediate visual representation of where each racquet stands in relation to every other racquet for the given performance category. High frequency (more "back-and-forths" per second) indicates higher stiffness, less bending distance, and less energy loss, but more shock. These limits guarantee that 1-10 (or so) most similar racquets will be highlighted. Dunlop. We play test all of our products to provide you with honest and knowledgable feedback so that you can shop with confidence. 3. Yonex EZONE 98 (305g) 20-27 kg / 45-60 lb: You may also find some of the tennis strings you purchase offer a recommended tension range. When a red or green similar button is clicked, each and every racquet on the graph is compared to the comparison racquet in every property specification in the table. Like sweet zone, the power potential is a performance measurement, not simply a static property characteristic. CLICK on a similar colored dot for the specs of the racquet to be displayed in the third column of the spec table. This is similar to 65R2, and really good shoes. Together, swingweight and twistweight determine the hittingweight (see spec table). We have not done specific experiments to determine control. An Example. Off-center Impacts. Choose one vertical swingweight line — if you click the top dot (fastest shot) and look at the twistweight (twt) in the table, and then click on the lowest dot, you will see that the twistweight is hightest for the fastest shot and lowest for the slowest shot. On-center Impacts. It is to be expected that off-center hits will twist the racquet, launching the ball either higher or lower. 3. 2. All Around Rackets. The drag coefficient is 0.51. The high swingweight racquet will have more power, greater bounce speed, slower swing and lower launch angle. SportsUncle is Ranked No.1 online sports store for buying ORIGINAL sport goods including Yonex Badminton Rackets, Cricket Bat, Carrom Board and more. Power potential can be measured anywhere on the racquet (TWU measures 15 locations), but for comparison purposes we compare at 21 in. String Stiffness: The Alpha and Omega of String Performance, How To Measure Your Racquet's Swingweight, Maximum Shot Speed — Where To Hit on the Racquet, Weight, Balance and Swingweight Explained, Tennis Ball Trajectories: Aerodynamic Drag and Lift in Tennis Shots, Tennis Shoe Cushioning: Impact Testing To Compare Tennis Shoes, Tennis Shoe Traction: Developing A Test Rig To Measure Shoe Traction On Tennis Courts, Foam Cushioning Properties: Choosing Material for Tennis Shoe Soles, Hockey Stick Contribution to Puck Speed in Slap Shots, Introduction to the Physics of Hockey Sticks. As swingweight decreases, the opposite occurs: shot speed can be faster or slower (generally slower), launch angle higher, distance longer, so flight time is also longer. The ratio of the ball's rebound speed to the impact speed is the power potential (usually expressed as a percentage). If it is 5%, then a racquet with a swingweight spec of 300 could acceptably come in from 285-315 kg x cm2 and balance spec of 33 could be 31.4-34.6 cm. 4. To throughly customize or match racquets, go to the TWU customization tools (Here and here). At the same time, more mass toward the head requires more … 2. ∨ 9. This ratio is also known as ACOR (apparent coefficient of restitution). If a predetermined maximum similar racquets is reached, the search will be terminated, but only if every racquet has been comapred at the concluding variance. This is a so-called dynamic test since the racquet must be swung to make the measurement (as opposed to static weight or balance measurements). 3. As swingweight increases shot speed increases, launch angle decreases, and distance decreases (for same effort swings), so time in the air naturally decreases. Recommended. Most players, either purposely or not, do not hit on center, and all the racquet's properties are then important. Our Quality Sporting Goods and 100% Genuineness is the key behind us to become the leader in the Sports Equipment domain and emerge as the most trusted one-stop online sports store in India. 2. It is the same physical measurement as swingweight but about the racquet's lengthwise axis instead of one perpendicular to it. Any two particular racquets can be chosen from the brand filters and a third random or positional racquet chosen by clicking on a dot on the graph. 3. This might be true in a controlled "everything else being equal" world, but that is never the case. Feather Shuttlecock or Plastic Shuttlecock – Which one to choose? The balance point does not always reflect the continuum of mass distribution. Up at the net, the 305g weight offers excellent control, and you'll be able to finish points with punchy volleys. More If you do the same dot clicking but this time for vibration (twistweight is no longer in play), you will see that the fastest shot at any swingweight is due to higher vibration frequency (stiffer racquet) and slower shots are due to lower frequecy (softer racquet). The relative velocities are shown as the lengths of the respective arrows (though not shown to scale and meant only for illustration purposes). The most important ingredient in spin is the relative speed of the strings to the ball in a plane parallel to the stringbed. Depending on the racquet, the center of the racquet is close to one of these nodes, the effect of vibration will be minimized, though usually not totally (hoop vibrations are not minimized however, though these don't affect shot speed much if any). Let's take a look at what Sportsuncle has in store for you, shall we? Also along this length there are two locations known as nodes, which if hit, do not initiate longitudinal racquet bending and vibration. Power potential is a property of the racquet but it is different at every location on the stringbed. Best racket ever made in badminton history. As dramatic as such statements sound, the impact location will almost always retain less than 50% of its velocity. Fortunately experimenting is very easy — simply take a roll of lead or tungsten tape on court and place and remove tape as desired. Consequently, the similarity itself will have a range. One reason is that performance measurements and calculations for every racquet are difficult, so descriptive "spec" measurements are used instead. 4. Both assumptions are necessary to reflect both theory and practice. Balance is best used as tie-breaker after you have decided upon power potential or swingweight. Tecnifibre. The sweet zone is the area of the stringbed located above 19 inches and has a power potential of 30% or more. This allows the customized twistweight to be accurately calculated. Distance increases with both shot speed and launch angle. 1. What one spec giveth another taketh away. As such, twistweight is an important component in the sweet zone measurement. This is probably the most universal and most paid-attention-to spec, not because it is most important, but because it is most familiar and easiest to measure. Performance is the combined product of all the specs, not the isolated result of a single spec. The program first checks for 1% matches, then 2%, then 3%, etc., up to 10% for all racquets. More First, blind test experiments have shown that most players cannot pick less than 10% difference in swingweights. 6. Vibration Frequency: This is the vibration frequency in cycles per second of the racquet ... ... Vibration is a measurement of rate of bending in a certain direction — as in the racquet head bending backward on impact. The data shown on each graph is of the same shot shown from a different perspective. 全世界で3,000ヶ所以上の施設に導入されているアロマ空間デザインの導入目的、効果などの事例をご覧いただけます。 蔵庫・洗濯機等の家電製品や住宅設備とフィルム・アルバム・ペーパー等のカメラ商材を多数取り扱っております。 Swingweight is a double-edged sword. from butt and 2 in. On center, the racquet plots will be much tighter with less scatter. 1. For same effort swings, as swingweight is increased swing speed decreases and power increases. ストhdビル5f tel：058-215-5858(採用部門直通) tel：058-253-8610(代表) fax：058-253-8710 Loss in spin due to increased swingweight may be minimized by choosing an open string pattern or a string with high spin potential. The lower frequency racquet will will deliver more bending energy to the hand, but less shock, since this energy transfer takes place over a longer distance and time. The drag coefficient is 0.51. More mass towards the tip and 3 and 9 o'clock always produces more power (though not necessisarily more shot speed). Comfort may still be a tradeoff because even though you have a more stable racquet with the higher swingweight, the force of impact will be greater due to your faster swing. Swingweight is a double-edged sword. The change in velocity is an indication of the severity of shock during impact. 2. 2. Its magnitude alone may or may not be important, depending on how it is distributed, as reflected in swingweight, twistweight, hittingweight, and power potential. Best Sellers. Like power potential, the sweet zone is a performance measurement, not simply a static property characteristic. Hittingweight uniquely determines the response of each impact location to collision with the ball. The ball will rebound with the same speed parallel to the racquet with both low and high swingweight racquets, but the perpendicular speed ("bounce speed") will vary with swingweight. All racquets in the yellow rectangle compared to the clicked purple racquet. The racquets found will be in the range designated at the top of the graph (e.g., "4 similar ∓ 0-8%"). This is not because of physical necessity but because of convention. A player might like the resulting performance but not the feel, like the feel and not the performance, like both, or hate both. However, it is primarily determined by amount and distribution of mass. Specs are deemed important because it is thought that each correlates to a performance benefit, need, or want. These three decelerations can, just for a instant, significantly decrease the hitting location velocity, sometimes to near zero or negative velocities. If you now click instead on the center impact choice, the graph will tighten. These affect how fast the strings slide past the ball. Mass distribution determines shot speed in two ways: the bounce speed from the racquet and the swing speed of the racquet. . Frame stiffness is one of the many things that can impact the playability of a tennis racquet and while not the most important consideration, it's … Hence, plowthrough depends on hittingweight, swingweight, twistweight and pre-impact velocity. Lacoste. Babolat . Figure 1: Example of power potential across stringbed for two racquets compared at each location. Lower vs. Higher String Tension. This speed is affected by swing speed, angle of swing, racquet tilt and the direction of the ball (rising, falling, or horizontal). Similar racquets may be close in all specs, say within 5%, but then each variant spec will combine with all the others in ways that may be behaviorally quite different. The target speed for all calculations is 50 mph. The impact point is 21 inches from the butt end and either on-center or 2 inches off-center. Off-center hits are the default because they are influeced by more racquet variables than are on-center hits. Two choices of swing speed are available — (1) all racquets swung at 50 mph, and (2) all racquets swung with the same effort as swinging a 310 swingweight racquet at 50 mph. The power of the racquet is not a measure of the final shot speed but rather of the racquet's contribution to that speed — the bounce speed. Shot speed will be the net effect. Perhaps you can even do this on every shot. This is illustrated in figures 1-4. 1. off-center. 尼崎市立武庫東中学校いじめ防止基本方針.pdf. The amount of mass and its distance from the axis of rotation (both lengthwise and widthwise) are the main determinants of power. 部郡美波町日和佐浦114番地 tel:0884-70-5831 fax:0884-70-5832. 東京オフィス 東京都新宿区神楽坂6丁目46番地 ローベル神楽坂ビル9f Hittingweight is always less than the weight of the racquet. Twistweight comes into play on off-center hits — higher twistweight yielding greater shot speeds (hence more scatter in the graph). More mass spread out toward the head creates more power, stability and comfort because the ball's effect on racquet momentum and direction is limited. やメールアドレスが掲載されていますので、そちらへお問い合わせください。 「 よくある質問 」もお読みなると良いでしょう。 ＜問い合わせ時に伝えること＞ This is the default value because our main objective is to compare and analyze racquets. The feel and performance of a racquet can be modified by adding mass at various locations along the racquet. These include power potential, sweet zone size, and vibration frequency. There is also less scatter for same speed swings because that eliminates the influence of swingweight on swing speed and the resulting shot speed. 者様からのお問合せ専用であり、営業等のご連絡につきましては全てお断りさせていただいております。 2. They are long-lasting and are available at the best possible price. If, for example, the nominal target is 300, the actual swingweight might vary between 291 and 309. 5. If all specs are within 10% or less variance then they are included as similar. How to select the Right Cricket Shoes for your Game. Why were the two hitting locations chosen? Bounce speed is determined as explained in "Power Help". However, since racquets are generally so similarly constructed and marketed, heavy racquets usually indicate high swingweight and power potential and light racquets less of these. Figure 1: Example of hittingweights across stringbed for two racquets compared at each location. The downside is less maneuverability. Swingweight is the only racquet parameter that has a strong correlation to every performance result. Twistweight will always increase if mass is added to either side of the center line from butt to tip. That is why we measure and calculate the combined result — the actual performance. 4. 1. Plow-Through: This is a measure of how much hitting location velocity remains just after impact ... . For racquets, that can be anywhere from +/- 2-5%. You can buy sports equipment online at the best price. All racquets in the green rectangle compared to the clicked purple racquet. For example, Babolat’s RPM Blast recommends 48 – 66 lbs or 22 – 30 kg, a rough guide for understanding where they have determined the string performs its best. Note: The following figures are also used to help explain the differences in distance, time, angle, and shot speed. Swingweight is generally the most difficult property to control. Wilson. This is illustrated in figures 1-4. Racquets that are similar in specs may vary considerably in performance. Energy Flow and Return Between a Tennis Ball and Stringbed, Free-standing vs Hand-held Racquet Testing. Assumptions — The analysis is based on an incident ball speed of 25 mph with spin of 3,000 rpm and hit at the top of the bounce, a swing angle of 19 degrees upward from horizontal, and racquet tilt of 10 degrees forward from vertical. Sure, it's a new year, but we're in worse shape right now than we were all of last year. The on-center hits will tell you about the ideal performance of the racquet. The bounce speed is then calculated as the power potential times the collision speed (sum of incident ball speed plus racquet speed). The same swing speed with all swingweights will require different efforts. Thus, the same effort swings applied to varying swingweights will produce varying swing speeds. Twistweight is primarily concerned with the distribution of mass from the middle of the racquet out to the periphery of the racquet head. 2. More mass spread out toward the head creates more power, stability and comfort because the ball's effect on racquet momentum and direction is limited. We have a wide range of options based on Player Level, Budget, Brand, Color, Size, etc. Some racquets can actually have less effective mass close to the periphery than the mass of the ball (about 57 g). The Similar Racquet Tool will always find a list of racquets that are closest in all specs. 4. String Stiffness: The Alpha and Omega of String Performance, How To Measure Your Racquet's Swingweight, Maximum Shot Speed — Where To Hit on the Racquet, Weight, Balance and Swingweight Explained, Tennis Ball Trajectories: Aerodynamic Drag and Lift in Tennis Shots, Tennis Shoe Cushioning: Impact Testing To Compare Tennis Shoes, Tennis Shoe Traction: Developing A Test Rig To Measure Shoe Traction On Tennis Courts, Foam Cushioning Properties: Choosing Material for Tennis Shoe Soles, Hockey Stick Contribution to Puck Speed in Slap Shots, Introduction to the Physics of Hockey Sticks, All racquets swung with same effort as 310 swingweight at 50 mph (default). For same effort swings, as swingweight increases, swing speed decreases and spin therefore also decreases. Second, any racquet that is on the low side of a desired value can be precisely customized with lead tape (see the Customization Tool). To determine bounce speed, we must first determine the power potential ratio (also known as ACOR, the apparent coefficient of restitution). This deceleration increases as you hit toward the tip or to the peripehry of the stringbed. Two factors mitigate against this having much significance. Cors is blocking my post request to the server. Similar racquets are color-coded to the two racquets chosen from the comparison racquet dropdowns. Because the results of off-center hits are influenced so heavily by twistweight and vibration frequency, there will be much more variation and scatter on the graph between racquets. Each click leads to new data, explanations, and information. Like all products, racquets are manufactured such that each feature/property specification has a plus-minus range of acceptability. The ball has top spin relative to the court, which is backspin relative to the racquet, and thus bounces up with reversed spin. On any given shot, you can always swing harder. All racquets in the purple rectangle compared to the clicked purple racquet. This reflects what some players might do to achieve their "grooved" swing preference and feel. At Sportsuncle we are not trying to be the biggest, but the best destination for the best sporting gear from around the world. If that is the case and it feels good to you, then adding swingweight will always increase shot speed and spin from your previous situation. Some of these brands you may have heard of while some you certainly must. What are the assumptions for the shot used in all the graphs? 1. Larger headsizes will naturally tend to have larger power zones because the mass is located further from the center line of the racquet. 1. This tool graphs performance results, not descriptive possibility. . Higher twistweight and frequency both add to power, and lower of each decreases it. More The same swing speed with all swingweights will require different efforts. Power potential is so important because it is the net result of every single characteristic, spec, and use of the racquet. It is a ratio as percentage of the ball velocity caused by the racquet (not by the speed of the swing) to the combined impact speed of the ball and racquet. At the same time, more mass toward the head requires more effort to generate swing speed. The instructions are simple: click on everything and anything that looks like a button or menu. The amount of increase depends on both the amount of mass added and its location. Therefore, choosing the best shuttlecock is just as important as finding the perfect racket. On-center hits were always faster than off-center hits (for hits at the same distance from the racquet end — 21 inches here). The strong correlation is witnessed by the fact that all the dots on the graphs can be fitted to a straight or curved line. The ball will also travel farther and have a longer flight time. The analysis is based on an incident ball speed of 25 mph with spin of 3,000 rpm and hit at the top of the bounce, a swing angle of 19 degrees upward from horizontal, and racquet tilt of 10 degrees forward from vertical. Power potential derives primarily from the amount and distribution of mass, both lengthwise and widthwise — farther from the axis of rotation increases power potential (see swingweight and twistweight). Any hit along the central racquet length is not influenced by twistweight. The low swingweight racquet will have a lower power, lesser bounce speed, faster swing, and higher launch angle. These both vary with the square of distance and linearly with mass. The bend begins at the impact point and moves up and down the racquet. You can read our customer reviews above where their satisfaction with our products can easily be seen. The power zone is also known as the sweet zone and is the area above 19 inches from the butt in which the power potential is greater than or equal to 30%.

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