softball core and compression chart

Youth Softball The top chart at right shows parameters for three softballs with the same weight (6.72oz) and compression (464lb), but varying COR values (0.41, 0.46, 0.51). Softballs with a higher COR are livelier and result in farther and faster-travelling hits. The ratio of ball-out to ball-in speeds determines the collision efficiency or BESR. High-compression softballs are 12-inch premium balls that professional players use. var isnDays = new Array("Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"); The data from this field study, along with other concurrent laboratory studies[6,7] revealed that all of the assumptions made in the F1890-98 test standard were incorrect. clcks=((sec<10)? "0":"")+min; Even though the numerical value of the BBS with the new standard is higher than with the older standard (98-mph compared to 85-mph), the new standard is actually a much stricter standard. These two leather swatches can come in either white or optic yellow. It may consist of a few different materials, including polyurethane, cork, and/or rubber. The cotton or linen string can be either raised, adding a better sense of grip, or run true with the cover. COR: The measurement of the bounce of the ball. Several research labs are attempting to collect and correlate data for this new measurement technique, and once the results are verified a new ASTM standard may be written for dynamic compression. Plentiful data exists showing that ball COR decreases as ball speed increases. An additional problem with "bat-out" measurements is that the bat often vibrates violently while it is rotating and recoiling from the collision. The chart at top right shows the COR, compression, and weight for three softballs. COMPRESSION AND COR . Data shows that the relative speed between bat and ball has a very large effect on the resulting elastic properties of the collision. Studies have shown that when the temperature is 100 degrees, an average softball looses 200 pounds of compression as compared with the same softball at 60 degrees. The collision efficiency is measured using the ball-in/ball-out method in equation (2). You can hear this difference when a batter makes contact. The pivot point of the bat was found to change during the swing, with the location at the moment of impact being approximately located at the wrist of the lower hand of the batter. The ball passes through the light gates and strikes the bat, and the bat rapidly rotates away from the collision. return yr The higher the COR, the more bouncy the ball is and, generally, the farther it will fly. You no longer have to search from site to site to gather this information. If a test shows that it takes 375 pounds of force to squeeze the ball by one-quarter inch, the ball is certified as a 375 pound compression ball. comp balls are softer or … The data shows that higher compression balls come off bats faster than lower compression balls, with the difference being slightly greater for high performance bats. If a ball is thrown at a wall at 80 miles per hour and bounces off at 40 miles per hour, the speed has been reduced by 50%. } How to Choose a Pair of Softball Batting Gloves, Everything You Need to Know About Softball Pants, How to Choose Sunglasses to Wear on the Diamond, How to Choose Baseball and Softball Turf Shoes, Softball Coaching Tips for Your First Practice, Softball Outfielder Tips: How to Read and React to a Ball Hit to the Outfield, Softball Hitting: Stride, Load and Timing, Delaney Spaulding’s Tips on Starting a Double Play, Do Not Sell My Personal Information – CA Residents Only. The way the ASA BBS standard works is as follows. In competitive play, yellow remains the official ball color, while white softballs are reserved for recreational leagues and some slow pitch. High-compression balls are hard and have the capacity to travel farther than other softballs. Compression and COR essentially deal with how far the ball will go when hit with a set amount of power. The new test standard, ASTM F2219[8], still uses a cannon to propel balls towards an initially stationary bat gripped in a freely rotating pivot. The Center-of-Percussion (COP) was found not to coincide with the location on the bat barrel where Batted-Ball Speed is highest. Actual bat-swing speeds for top A-level slow-pitch players were found to be around 89-mph (not 70-mph) with D-level players swing bats at 81-mph (not 60-mph). The ball must rebound through at least two of the light gates to be considered a valid hit, and a high-speed camera is used to monitor the trajectory of the rebounding ball. document.write(dname + ", " + mname + " " + day + ", " + year + "
"); *Reference prices are past offerings. The higher the COR, the more bouncy the ball is and, generally, the farther it will fly. The ASA "rounds up" to assign the compression rating. In 2002 the ASA commissioned a study of a wide variety bats encompassing the 30-year history of non-wood bat types as well as covering the entire range of performance. They have a polyurethane or cork core and a long-lasting synthetic leather covering. Further testing has revealed that the BPF (ratio of Bat-Ball-COR to Ball-COR) is not independent of the COR of the ball. hrs=today.getHours(); COR represents how "bouncy" the ball is. Instead, the location of maximum BBS tends to vary from bat to bat. Those standards, however, may do nothing to make the game safer for pitchers and infielders, according to the ball experts. The ball would be rated with a COR of .50 (referred to as a fifty COR ball). This rule change was brought about in order to make the ASA League similar to the USSSA League and find common ground for the bats used. Core: The part of the softball you never see is the core. var isnMonths = new Array("January","February","March","April","May","June","July","August","September","October","November","December"); They have the maximum level of compression at a 530-pound rating. Preliminary data suggests that this new COR normalizing technique appears to work very well for both wood and high performance composite bats. var today = new Date(); "; At the moment, however, the question of using a "bat-out" measurement to obtain the collision efficiency for the ASA BBS standard may be somewhat of a moot point. If you have concerns over the confidentiality of your information, please email us at batreviews@hotmail.com. Softballs are rated based on two metrics - Coefficient Of Restitution (COR - pronounced like core) and compression. The bottom plot at right shows the calculated BBS for four softball bats, of varying performance, tested with these three softballs. This means your league may be playing with a ball rated as 375 compression, but it is really softer than a true 375 compression ball because of the "rounding up. var yr = n.getYear() A second important discovery was that the old F1890 standard was not correctly predicting the difference between high performing bats and the extremely high performing composite bats that began appearing in 2001 and 2002. The Amateur Softball Association began regulating the performance of slow-pitch softball bats in 2000. Many bats which passed the old 85-mph BBS standard using F1890 no longer passed the new 98-mph standard using F2219. To make sure that you pick the right size for your league or organization, talk to your coach or league official before making a purchase. We cut through the B.S. In light of this data, the COR normalization was removed from the ASTM F2219 test standard in 2005. If your league plays with a .44 COR ball, the speed bouncing off the wall would be 35 miles per hour.Softball compression is a measure of how hard a softball is. { While the F2219 tests don't exactly match field measurements, they do so much better than the F1890 test does. 70 degrees and sunny creates lower compression balls than if it was 70 degrees and cloudy. Currently, COR is measured as the ratio of ball-out to ball-in speeds when a ball is fired from a cannon with an initial speed of 60-mph towards a rigid wall. There are a number of different designs, stamps and measurements found on the leather canvas, but all of them are important to keep in mind. if (yr < 1000) yr += 1900 Their construction has advanced greatly since the sport’s beginnings, and the respective design and features of a softball can heavily impact your performance on the field. A detailed understanding of what separates one softball from the next. Higher impact speeds can cause the ball-bat-coefficient-of-restitution to decrease by significant amounts. Its not that easy. Leather balls generally take on more moisture in rainy or humid conditions than synthetic balls. This throws into question the entire validity of the BPF standard as a legitimate predictor of performance. --> The bottom chart shows the normalized calculated BBS for four softball bats covering the entire range of performance. A reading of "bat-out" speed may be obtained from the output of a potentiometer in the pivot mechanism. If the balls typically used in the field have a different weight, COR or compression than the ball used in the laboratory test, then the simple procedure above will not accurately predict BBS in the field. Each gate is triggered when the ball breaks the plane of light, and the ball speed is measured as the distance between pairs of light gates divided by the time between trigger signals. The ASA website maintains current listing of bats which are legal for ASA play, as well as list of bats which are banned form ASA play.

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