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General Tennis Quality

fighterusa212010-02-15 19:11:22 +0000 #1
General official tennis ball is a multi?
85.4809 million2010-02-15 19:13:27 +0000 #2
the size of the ball in Appendix 1 are required to meet the requirements of Article IV (3 balls in the rules in the detection of specific instructions), weighing between 2 ounces (56.7 grams) and 2 further 1 / 6 ounces (58.5 grams) between the. From the 100-inch (254 cm) height to the concrete floor to free fall campaign, the rebound height should be between 53 inches (134.62 centimeters) and 58 inches (147.32 centimeters) between the. When the ball is applied to 18 pounds (8.165 kilograms) of pressure, the inward elastic deformation occurs should be between 0.22 inches (0.559 cm) and 0.29 inches (0.737 centimeters), with a rebound after compression deformation should range from 0.315 inches (0.8 cm) and 0.425 inches (1.08 cm) between the. These two kinds of deformation data should be based on the ball three-axis test to be average. In each case the difference between any two data can not be larger than 0.03 inches (0.076 cm).

If at an altitude of 4000 feet (1219 meters) high to compete, we need to adopt the other two special balls. The first is a high degree of inter jumping to between 48 inches (121.92 centimeters) and 53 inches (134.62 centimeters), the also to make the ball's internal pressure is greater than the external pressure, the other side is identical with the above description, this ball often referred to as pressurized ball; the second addition to bouncing the ball high to 53 inches (134.62 centimeters) and 58 inches (147.32 centimeters) between, but also to make the ball pressure is approximately equal to the external pressure, and can be the altitude specified venues to keep more than 60 days, the other side is identical with the above description, this ball is often referred to as zero-pressure ball or non-pressure the ball.

International Tennis Federation will have any questions about whether a ball or samples meet the above criteria, or whether it can be approved for the issue of race ruling. Such a ruling may be to initiate acts of ITF itself may also be the basis of all really interested in, or including any player, equipment manufacturer or the national tennis association, and their members to carry out the application. Such decisions should be based on ITF application and the review and hearing processes.
The more water-Lin sound2010-02-15 19:25:43 +0000 #3
10 grams or so, there should be no specific provisions

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