Despite the similarities with the Brazuca, the few differences between this ball and what players have gotten used to over the last four years will have an impact on play, says Firoz Alam, an aerodynamics engineer at the Royal Melbourne Institute of Technology in Australia, who has also performed wind tunnel tests on the Telstar 18. “When the player is making a short pass, they have to push a little harder, because at less then 60 kilometers per hour [or 37 miles per hour]it has more flight resistance than the Brazuca,” says Alam. The mid-range passes and corner kicks that gave the Jabulani so much trouble have been resolved. Compared to the Brazuca, the Telstar 18 is also more aerodynamically efficient in the 40-50 mile an hour range, so Alam says players will actually have to kick a little softer or they’re likely to overshoot. Over 55 miles an hour the two balls will feel very similar.
When looking for the right ball for your child, you may come across a reference to different sizes of soccer balls. These sizes can vary a bit from product to product but most do conform to certain league standards. A size 1 ball is also known as a mini ball and is typically between 18 and 20 inches in circumference. This size is perfect for toddlers and early walkers to help them develop footwork skills and ball control. A size 3 ball, or a junior ball, is usually between 23 and 24 inches around. This is the type of ball that most peewee soccer teams use as it is designed for children 8 years and younger. As your child grows and continues with their soccer team, they will eventually need a size 4 ball which is 25 to 26 inches. This is known as a youth ball and is ideal for children between 8 and 12 years of age. Finally, the size 5 or adult ball is 27 to 28 inches in circumference. This is the size of the soccer ball used by professional athletes and is suitable for anyone age 13 years or older.
The outer casing of a soccer ball is composed of panels made from synthetic materials, such as PVC, PU, or a combination, sewn or glued together. Soccer ball casings are rarely leather anymore, since leather tends to absorb moisture making the ball heavier and not perform as well. The number of panels or sections of the outer casing varies according to design. Most professional soccer balls are the 32-panel design. More panels mean a rounder and stabler ball, and a more accurate flight.
A: Butyl bladders are an excellent choice for the interior of soccer balls because they create an airtight seal in the inner compartment. This helps greatly with air retention. Even better, you will not have to keep inflating soccer balls that contain a butyl bladder for the fact that they hold air much longer than soccer balls that don’t have a bladder made from butyl rubber.
On the other hand, replicas (sometimes called training balls or gliders) are designed to be just like the official match balls but are much cheaper. Their panels are often stitched rather than thermally-bonded and are made of a different material. However, they’re not necessarily less durable than official match balls. So, they’re the recommended option for most players. https://www.youtube.com/watch?v=j2Xn84L3Kcs