The new ball for 2010 World Cup will make more trouble for goalkeepers as it will be faster and more erratic than its predecessors, an Australian scientist said on Tuesday.

The ball, which was named Jabulani ("to celebrate" in Zulu), are complained by players that it behaves erratically and they are having difficulty judging its trajectory.

England goalkeeper David James has described new Adidas ball as "horrible", Spain's Iker Casillas says it is "rotten" and Gianluigi Buffon of Italy fears its "unpredictability" could ruin the World Cup.

Research by Adelaide University's Derek Leinweber would appear to back up complaints.

Professor Leinweber said the players had a point, with his computer simulations showing it was faster than previous balls, while its rough surface made it more erratic.

"And ... they bend better," he said. "What it means is that the goalkeeper's intuition is just a little bit off. You see the ball coming towards you, you might quickly work out where the ball is going to be, and something different happens."

Leinweber, who heads the university's chemistry and physics school, simulated trajectories for the almost perfectly spherical Jabulani which took into account the aerodynamic impact of the ball's unique tiny ridges.

"Any sort of texture on the ball, or grooves that are on the surface of the soccer ball, that has a big impact on the nature of the air flow," he said.

【体坛英语资讯：New World Cup ball creates more trouble for keepers: Australian scientist】相关文章：

★ 体坛英语资讯：CFA Chief: China willing to host 2018 World Cup

★ 体坛英语资讯：Maradona wants to coach Argentine Olympic team

★ 体坛英语资讯：Bayi loses do-or-die Game 4 to exit CBA play-offs

★ 体坛英语资讯：China trounces Singapore 7-1 in AFC U-19

★ 体坛英语资讯：Beckham says hes fit for England selection

★ 体坛英语资讯：Beckham takes captains armband for friendly

★ 体坛英语资讯：Messi and Umtiti close to fitness for vital forthcoming games

★ 娱乐英语资讯：Kidman backs U.N. drive to end violence against women

★ 体坛英语资讯：Kuznetsova ends Sharapovas run

★ 体坛英语资讯：Liu, Murofushi spearhead Asian hopes