I have about 30 soccer balls- price listed is per ball. I have more than the 12 pictured- some doubles of the champions league balls, two of the unwrapped Brine ball, 5 or so futsal balls. Some are worth more than 25, some less. Just make me a good off and tell me which ball you want! Keep in mind when you offer that I am paying most of the shipping already. Balls will ship deflated. I will reconfirm that all hold air and make sure they are cleaned off before shipping. There is only one ball in the lot that has a gouge/ panel issue. All aside are in good playable shape.
When any object goes through the air, a thin cushion of air wraps around it that stays relatively still. This boundary layer is why you get dust trapped on your ceiling fan. At slower speeds, the air around a soccer ball moves smoothly over the surface and separates off the sides of the ball at its widest points. Imagine a ball moving from right to left across a clock, Goff explains, so traveling from the 3 to the 9. With laminar flow, the air flows over the surface and then flows off at the 12 and 6, which creates more drag in the air. Drag slows the ball down faster. At higher speeds, the air moves turbulently across the ball’s surface and peels off at the 2 and 4. The wind effectively wraps around the back. This turbulent flow has less drag, which means the ball keeps moving at high speed for longer.
This size ball, the smallest aside from mini-balls not used for real practices or games, weighs 10 oz. and can be used for players under 8. The No. 3 ball is only 24 inches in circumference and thus doesn't come up as high on the leg as an adult model. You don't need to provide a match-quality ball for your young player, write the authors of "The Complete Idiot's Guide to Coaching Youth Soccer."
The soccer is the world's most popular and widely watched game. Due to increasing technological advancement and demand for performance, the ball manufacturers have been developing new designs progressively. A traditional spherical football made of 32 leather panels stitched together in 1970s has become only 14 synthetic curved panels thermally bonded without stitches ball in 2006 and more recently 8 panels football in 2010. Despite being most popular game in the world, scan data is available on aerodynamic properties of footballs especially Jabulani, Teamgeist and Fevernova balls. The primary objectives of this study were to evaluate aerodynamic performances of these three soccer balls. The aerodynamic forces and moments were measured experimentally for a range of wind speeds. The aerodynamic forces and their non-dimensional coefficients were determined and compared.
This year, the ball shouldn’t have that kind of impact on which team wins the World Cup. In wind tunnel tests, Goff found that Telstar 18 has a very similar aerodynamic profile to the 2014 Brazuca ball, which flew without the wobbles of the Jabulani. The Jabulani was the first ball to have six seams and despite having a roughened surface, it was too smooth, says Goff. When the Brazuca was released, it had 68 percent more seams than the Jabulani to help change the airflow around the ball. The Telstar 18 is even more improved. Instead of transitioning to laminar flow in the middle of free kicks, Goff found that the Telstar 18 goes through its drag crisis at a lower speed of 38 miles an hour.
For those taking their game to the next level, it’s important to train with a ball similar to what is used for your matches. Your passing, shooting and general foot skills will be different for lighter soccer balls made with a premium bladder like latex. Try out an NFHS approved ball which is used for some club, high school, and college teams. To be NFHS approved, the soccer ball needs to: