Home / News / Technology news /

New World Cup football will unsettle goalkeepers

The new football that will be used for the first time in the World Cups opening game on Friday (9 June 2006) is likely to bamboozle goalkeepers at some stage of the tournament, a leading scientist has warned. The Adidas �Teamgeist football has just 14 panels - with fewer seams - making its surface �smoother than conventional footballs which have a 26 or 32 panel hexagon-based pattern. This makes it aerodynamically closer to a baseball and, when hit with a slow spin, will make the ball less stable, giving it a more unpredictable trajectory in flight.

Posted by Chacmool
11 June, 2006 10:06:19

print article
A | A | A

"With a very low spin rate, which occasionally happens in football, the panel pattern can have a big influence on the trajectory of the ball and make it more unpredictable for a goalkeeper," said Dr Ken Bray, a sports scientist at the University of Bath and author of the new popular science book How to score � science and the beautiful game.

"Because the Teamgeist ball has just 14 panels it is aerodynamically more similar to the baseball which only has two panels.

"In baseball, pitchers often throw a curve ball which is similar to a swerving free kick and the rotating seam disrupts the air flow around the ball in much the same way as a football does.

"Occasionally though, pitchers will throw a knuckleball which bobs about randomly in flight and is very disconcerting for batters.

"It happens because pitchers throw the ball with very little spin and as the ball rotates lazily in the air, the seam disrupts the air flow around the ball at certain points on the surface, causing an unpredictable deflection.

"With the worlds best players in Germany this summer, there are bound to be plenty of spectacular scoring free kicks.

"But watch the slow motion replays to spot the rare occasions where the ball produces little or no rotation and where goalkeepers will frantically attempt to keep up with the balls chaotic flight path."

The ball, which has been used by teams competing in the World Cup in practice sessions, has already been criticised by England goalkeeper Paul Robinson and Germany goalkeeper Jens Lehmann for its light-weight and unpredictable behaviour.

Source: University of Bath

Comments (1 posted):

cwes99_03 on 11 June, 2006 04:12:44

Doesn't seem to have affected it so far as I have seen. I've only caught a couple of the games that are played on national broadcast over here in the US. The ball didn't seem to be making erratic curves or movements when hit. BTW what's up with the rating at the top of my reply. It doesn't tell me how to rate or what to look for in rating, so I guess everything get's 1's.